HomeMy WebLinkAboutCITY OF FORT COLLINS, UTILITY ADMINISTRATION BUILDING - FDP - FDP150018 - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTA. Location ....................................................................... 1
B. Description of Property ........................................................... 2
C. Floodplain...................................................................... 3
A. Major Basin Description ..........................................................5
B. Sub-Basin Description ............................................................ 5
A. Regulations..................................................................... 5
B. Four Step Process ...............................................................6
C. Development Criteria Reference and Constraints ......................................6
D. Hydrological Criteria ............................................................. 7
E. Hydraulic Criteria ...............................................................7
F. Modifications of Criteria .......................................................... 7
A. General Concept ................................................................ 7
B. Specific Details .................................................................8
A. Compliance with Standards .......................................................9
B. Drainage Concept ...............................................................9
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Due to the site’s proximity to the
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Due to the site’s proximity to the floodway identified in La
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DE CE CE vs. DE PC PC vs. CE
(Duplicate
Effective)
(Corrected
Effective)
(Proposed
Condition)
Section ID W.S. Elev W.S. Elev W.S. Elev W.S. Elev W.S. Elev
(ft) (ft) (ft) (ft) (ft)
766 4981.43 4981.37 -0.06 4981.32 -0.05
896 4983.81 4983.66 -0.15 4983.67 0.01
1017 4984.3 4984.21 -0.09 4984.2 -0.01
1101 4984.73 4984.73 0 4984.73 0
1218 4985.07 4985.07 0 4985.07 0
1398 4986.97 4986.97 0 4986.97 0
the “Four Step Process” to minimize adverse impacts of urbanization on receiving waters.
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employed to design the project’s water quality features. The second event analyzed is
the “Minor,” or “Initial” Storm, which has a 2
event considered is the “Major Storm,” which has a 100
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Basin
Basin
Area
Portion of Basin
Captured
(sq.ft.)
Treatment
Type
1 40455 40455 Extended Detention
2 7587 7587 Rain Garden
OS1 522 0 None
OS2 4588 0 None
OS3 2012 0 None
OS4 286 0 None
Total 55450 48042 Total Percentage
Treated: 86.64%
Collins’ Stormwater Criteria Manual.
CHARACTER OF SURFACE:
Runoff
Coefficient
Percentage
Impervious Project: 940-002
Streets, Parking Lots, Roofs, Alleys, and Drives: Calculations By: ATC
Asphalt ……..……………..………...…..……………….…………………………………. 0.95 100% Date:
Concrete ……...……………….….……….………………..….……………………………… 0.95 90%
Gravel ……….…………………….….…………………………..………………………………. 0.50 40%
Roofs …….…….………………..……………….…………………………………………….. 0.95 90%
Pavers…………………………..………………..…………………………………………….. 0.40 22%
Lawns and Landscaping
Sandy Soil ……..……………..……………….…………………………………………….. 0.15 0%
Clayey Soil ….….………….…….…………..………………………………………………. 0.25 0% 2-year Cf = 1.00 100-year C
f = 1.25
Basin ID Basin Area
(s.f.)
Basin Area
(ac)
Area of
Asphalt
(ac)
Area of
Concrete
(ac)
Area of
Roofs
(ac)
Area of
Gravel
(ac)
Area of
Lawn, Rain
Garden, or
Landscaping
(ac)
2-year
Composite
Runoff
Coefficient
10-year
Composite
Overland Flow, Time of Concentration:
Project: 940-002
Calculations By:
Date:
Gutter/Swale Flow, Time of Concentration:
Tt = L / 60V
Tc = Ti + Tt (Equation RO-2)
Velocity (Gutter Flow), V = 20·S½
Velocity (Swale Flow), V = 15·S½
NOTE: C-value for overland flows over grassy surfaces; C = 0.25
Is Length
>500' ?
C*Cf
(2-yr
Cf=1.00)
C*Cf
(10-yr
Cf=1.00)
C*Cf
(100-yr
Cf= 1.25)
Length,
L
(ft)
Slope,
S
(%)
Ti
2-yr
(min)
Ti
10-yr
(min)
Ti
100-yr
(min)
Length,
L
(ft)
Slope,
S
(%)
Velocity,
V
(ft/s)
Tt
(min)
Length,
L
(ft)
Slope,
S
(%)
Velocity,
V
(ft/s)
Tt
(min)
2-yr
Tc
Area Inlet Performance Curve:
Inlet C1
Governing Equations:
At low flow depths, the inlet will act like a weir governed by the following equation:
* where P = 3.1416*Dia.of grate
* where H corresponds to the depth of water above the flowline
At higher flow depths, the inlet will act like an orifice governed by the following equation:
* where A equals the open area of the inlet grate
* where H corresponds to the depth of water above the centroid of the cross-sectional area (A)
The exact depth at which the inlet ceases to act like a weir, and begins to act like an orifice is unknown.
However, what is known, is that the stage-discharge curves of the weir equation and the orifice equation
will cross at a certain flow depth. The two curves can be found below:
If H > 1.792 (A/P), then the grate operates like an orifice; otherwise it operates like a weir.
Input Parameters:
Type of Grate: PERFORATED MANHOLE COVER
Diameter of Grate (ft): 0.67
Open Area of Grate (ft2): 0.23
Flowline Elevation (ft): 0.000
Clogging Factor: 20%
Depth vs. Flow:
Depth Above Inlet (ft)
Elevation
(ft)
Shallow
Weir Flow
(cfs)
Orifice
Flow
(cfs)
Actual
Flow
(cfs)
0.00 0.00 0.00 0.00 0.00
0.10 0.10 0.16 0.31 0.16 2-yr = 0.08 cfs
0.20 0.20 0.45 0.44 0.44
0.30 0.30 0.83 0.54 0.54
0.40 0.40 1.28 0.62 0.62
0.50 0.50 1.79 0.70 0.70
0.60 0.60 2.35 0.76 0.76
0.70 0.70 2.96 0.82 0.82
0.80 0.80 3.61 0.88 0.88
0.90 0.90 4.31 0.93 0.93
1.00 1.00 5.05 0.99 0.99
Q 3 . 0 P H 1 . 5
Q 0 . 67 A ( 2 gH ) 0 . 5
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
Discharge (cfs)
Stage (ft)
Stage -Discharge Curves
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WATER QUALITY DESIGN CALCULATIONS
Water Quality Capture Volume (12-Hr. PLD)
Project: 940-002
By: ATC
Date: 4/1/15
REQUIRED STORAGE & OUTLET WORKS:
BASIN AREA (ac) = 0.930 < -INPUT from impervious calcs
BASIN IMPERVIOUSNESS PERCENT = 46.00 < -INPUT from impervious calcs
BASIN IMPERVIOUSNESS RATIO = 0.4600 <-CALCULATED
WQCV (watershed inches) = 0.160 < -CALCULATED from Figure EDB-2
WQCV (cu-ft) = 540 < -CALCULATED from UDFCD DCM V.3 Section 6.5
Calculating the WQCV and Volume Reduction Chapter 3
3-6 Urban Drainage and Flood Control District August 2011
Urban Storm Drainage Criteria Manual Volume 3
Once the WQCV in watershed inches is found from Figure 3-2 or using Equation 3-1 and/or 3-2, the
required BMP storage volume in acre-feet can be calculated as follows:
푉=
WQCV
12
퐴 Equation 3-3
Where:
V = required storage volume (acre-ft)
A = tributary catchment area upstream (acres)
WQCV = Water Quality Capture Volume (watershed inches)
Figure 3-2. Water Quality Capture Volume (WQCV) Based on BMP Drain Time
Project: 940-002
By: ATC
Date: 4-15-15
Note: Volume calculations utilize Conic Method
Pond Stage Depth Surface Area Incremental Total Volume Total Volume
of ContourVolume
(FT) (SF) (Cu-Ft) (Cu-Ft) (Ac-Ft)
4980.5 0.00 0
4981 0.50 404 67 67 0.002
4982 1.00 1384 844 912 0.021
Pond Volume Calculations
Porous Landscape Detention Area
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FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 1 of 28
HEC-RAS Version 4.1.0 Jan 2010
U.S. Army Corps of Engineers
Hydrologic Engineering Center
609 Second Street
Davis, California
X X XXXXXX XXXX XXXX XX XXXX
X X X X X X X X X X
X X X X X X X X X
XXXXXXX XXXX X XXX XXXX XXXXXX XXXX
X X X X X X X X X
X X X X X X X X X X
X X XXXXXX XXXX X X X X XXXXX
PROJECT DATA
Project Title: Laporte Street Hydraulics
Project File : Laporte_DE.prj
Run Date and Time: 4/28/2015 1:23:12 PM
Project in English units
Project Description:
Laporte Street Floodplain Model
For this hydraulic model, the gutter flowline
elevation was determined based on interpolation of the available topography in
the street. The measured curb height was then added to this elev. to determine
the elev. of the top of the curb. At some locations, this elev. was higher then
the adjacent contour behind the curb, a condition that does not reflect actual
ground conditions, so the adjacent contour behind the curb was disregarded with
ground elevations in the model defined by skipping to the next available
contour. The floodplain was plotted using this info, and at some locations
(XS's 2723 & 2591) is plotted entirely in the gutter instead of showing the
flow leaving the street, contrary to what an initial look at the WSEL and the
contours would indicate.
PLAN DATA
Plan Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Plan File : C:\temp\940-002\DE\Laporte_DE.p02
Geometry Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : C:\temp\940-002\DE\Laporte_DE.g02
Flow Title : Laporte - 2-, 10-, and 100-YR Flows (no splits)
Flow File : C:\temp\940-002\DE\Laporte_DE.f02
Plan Summary Information:
Number of: Cross Sections = 14 Multiple Openings = 0
Culverts = 0 Inline Structures = 0
Bridges = 0 Lateral Structures = 0
Computational Information
Water surface calculation tolerance = 0.01
Critical depth calculation tolerance = 0.01
Maximum number of iterations = 20
Maximum difference tolerance = 0.3
Flow tolerance factor = 0.001
Computation Options
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 2 of 28
Critical depth computed at all cross sections
Conveyance Calculation Method: At breaks in n values only
Friction Slope Method: Program Selects Appropriate method
Computational Flow Regime: Mixed Flow
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 3 of 28
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 38.2 5015 F
129.9 144.1 5015 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 5004.11 Element Left OB Channel Right OB
Vel Head (ft) 0.18 Wt. n-Val. 0.016
W.S. Elev (ft) 5003.93 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5003.97 Flow Area (sq ft) 12.86
E.G. Slope (ft/ft) 0.007988 Area (sq ft) 12.86
Q Total (cfs) 44.00 Flow (cfs) 44.00
Top Width (ft) 47.61 Top Width (ft) 47.61
Vel Total (ft/s) 3.42 Avg. Vel. (ft/s) 3.42
Max Chl Dpth (ft) 0.73 Hydr. Depth (ft) 0.27
Conv. Total (cfs) 492.3 Conv. (cfs) 492.3
Length Wtd. (ft) 132.00 Wetted Per. (ft) 48.56
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.13
Alpha 1.00 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.01 0.52 0.01
C & E Loss (ft) Cum SA (acres) 0.06 1.82 0.12
Warning: Divided flow computed for this cross-section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5004.39 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5004.10 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5004.16 Flow Area (sq ft) 22.47 1.16
E.G. Slope (ft/ft) 0.008016 Area (sq ft) 22.47 1.16
Q Total (cfs) 97.00 Flow (cfs) 96.47 0.53
Top Width (ft) 71.91 Top Width (ft) 59.36 12.55
Vel Total (ft/s) 4.11 Avg. Vel. (ft/s) 4.29 0.45
Max Chl Dpth (ft) 0.90 Hydr. Depth (ft) 0.38 0.09
Conv. Total (cfs) 1083.4 Conv. (cfs) 1077.5 5.9
Length Wtd. (ft) 132.00 Wetted Per. (ft) 60.53 12.55
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.19 0.05
Alpha 1.09 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.05 1.17 0.07
C & E Loss (ft) Cum SA (acres) 0.20 2.82 0.32
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5004.99 Element Left OB Channel Right OB
Vel Head (ft) 0.60 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5004.40 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5004.54 Flow Area (sq ft) 39.86 5.54
E.G. Slope (ft/ft) 0.008001 Area (sq ft) 39.86 5.90
Q Total (cfs) 256.00 Flow (cfs) 249.84 6.16
Top Width (ft) 79.20 Top Width (ft) 59.40 19.80
Vel Total (ft/s) 5.64 Avg. Vel. (ft/s) 6.27 1.11
Max Chl Dpth (ft) 1.20 Hydr. Depth (ft) 0.67 0.36
Conv. Total (cfs) 2862.0 Conv. (cfs) 2793.1 68.9
Length Wtd. (ft) 132.00 Wetted Per. (ft) 60.83 15.60
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.33 0.18
Alpha 1.21 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.32 2.86 0.41
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 7 of 28
Length Wtd. (ft) 176.00 Wetted Per. (ft) 6.80 60.73 15.41
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.13 0.53 0.85
Alpha 1.37 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.87 Cum Volume (acre-ft) 0.32 2.66 0.37
C & E Loss (ft) 0.01 Cum SA (acres) 0.97 3.66 1.11
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2301
INPUT
Description: Laporte between Sherwood and Whitcomb
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4997 25.4 4997 48.7 4996.6 48.8 4995.9 54.4 4996
78.1 4996.5 90.9 4996 107.5 4995.4 107.6 4996.1 142.8 4997
144.6 4997
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 48.7 .016 107.6 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
48.7 107.6 208 208 208 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 32.1 5007 F
123.7 144.6 5007 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4996.47 Element Left OB Channel Right OB
Vel Head (ft) 0.58 Wt. n-Val. 0.016
W.S. Elev (ft) 4995.88 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.07 Flow Area (sq ft) 3.26
E.G. Slope (ft/ft) 0.030108 Area (sq ft) 3.26
Q Total (cfs) 20.00 Flow (cfs) 20.00
Top Width (ft) 13.47 Top Width (ft) 13.47
Vel Total (ft/s) 6.13 Avg. Vel. (ft/s) 6.13
Max Chl Dpth (ft) 0.48 Hydr. Depth (ft) 0.24
Conv. Total (cfs) 115.3 Conv. (cfs) 115.3
Length Wtd. (ft) 208.00 Wetted Per. (ft) 13.90
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.44
Alpha 1.00 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.62 Cum Volume (acre-ft) 0.01 0.45 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.06 1.56 0.11
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
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Page 11 of 28
Warning: The energy equation could not be balanced within the specified number of iterations.
The program selected the water
surface that had the least amount of error between computed and assumed values.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4990.86 Element Left OB Channel Right OB
Vel Head (ft) 0.34 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.52 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4990.61 Flow Area (sq ft) 0.54 6.13 0.67
E.G. Slope (ft/ft) 0.021619 Area (sq ft) 0.54 6.13 0.67
Q Total (cfs) 31.00 Flow (cfs) 0.69 29.45 0.85
Top Width (ft) 35.12 Top Width (ft) 2.60 29.32 3.20
Vel Total (ft/s) 4.22 Avg. Vel. (ft/s) 1.27 4.81 1.28
Max Chl Dpth (ft) 0.42 Hydr. Depth (ft) 0.21 0.21 0.21
Conv. Total (cfs) 210.8 Conv. (cfs) 4.7 200.3 5.8
Length Wtd. (ft) 184.00 Wetted Per. (ft) 2.63 29.33 3.23
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.28 0.28 0.28
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 1.91 Cum Volume (acre-ft) 0.04 0.95 0.06
C & E Loss (ft) 0.00 Cum SA (acres) 0.15 2.18 0.22
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4991.47 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.84 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4991.01 Flow Area (sq ft) 1.72 19.37 2.12
E.G. Slope (ft/ft) 0.018484 Area (sq ft) 1.72 19.37 2.12
Q Total (cfs) 133.00 Flow (cfs) 2.97 126.37 3.66
Top Width (ft) 62.45 Top Width (ft) 4.62 52.13 5.70
Vel Total (ft/s) 5.73 Avg. Vel. (ft/s) 1.73 6.52 1.73
Max Chl Dpth (ft) 0.74 Hydr. Depth (ft) 0.37 0.37 0.37
Conv. Total (cfs) 978.3 Conv. (cfs) 21.8 929.5 27.0
Length Wtd. (ft) 184.00 Wetted Per. (ft) 4.68 52.15 5.75
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.42 0.43 0.43
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 1.89 Cum Volume (acre-ft) 0.29 2.40 0.33
C & E Loss (ft) 0.00 Cum SA (acres) 0.84 3.04 0.94
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
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LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 15 of 28
Length Wtd. (ft) 201.00 Wetted Per. (ft) 58.71
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.03
Alpha 1.00 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.41 Cum Volume (acre-ft) 0.04 0.85 0.05
C & E Loss (ft) 0.02 Cum SA (acres) 0.14 1.81 0.22
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4987.78 Element Left OB Channel Right OB
Vel Head (ft) 0.09 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4987.70 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4987.32 Flow Area (sq ft) 6.60 53.49 3.55
E.G. Slope (ft/ft) 0.000780 Area (sq ft) 30.67 53.49 7.82
Q Total (cfs) 133.00 Flow (cfs) 2.46 129.67 0.87
Top Width (ft) 211.78 Top Width (ft) 107.10 57.80 46.88
Vel Total (ft/s) 2.09 Avg. Vel. (ft/s) 0.37 2.42 0.24
Max Chl Dpth (ft) 1.20 Hydr. Depth (ft) 0.40 0.93 0.21
Conv. Total (cfs) 4760.6 Conv. (cfs) 88.1 4641.5 31.0
Length Wtd. (ft) 201.00 Wetted Per. (ft) 16.70 59.22 17.00
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.02 0.04 0.01
Alpha 1.31 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.25 Cum Volume (acre-ft) 0.21 2.13 0.31
C & E Loss (ft) 0.04 Cum SA (acres) 0.49 2.55 0.83
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1398
INPUT
Description: Cross Section 13+98
Station Elevation Data num= 19
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988 10 4988 12 4987 17 4986 63 4986
74 4986.13 74 4987.45 75 4987.45 75 4987 90 4986
90 4985.25 112 4986 120 4986.05 130 4986 150 4985.25
150 4986 170 4986.24 235 4987 335 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 90 .016 150 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
90 150 180 180 180 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
170 335 4995 F
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Page 19 of 28
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1101
INPUT
Description: Cross Section 11+01
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 20 4985 40 4984 40 4983.25 70 4983.83
103 4983.25 103 4984 125 4985 163 4986 188 4987
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 40 .016 103 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
40 103 84 84 84 .1 .3
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4995 148 188 4995
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4984.13 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.94 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4983.94 Flow Area (sq ft) 25.16
E.G. Slope (ft/ft) 0.004963 Area (sq ft) 25.16
Q Total (cfs) 88.00 Flow (cfs) 88.00
Top Width (ft) 63.00 Top Width (ft) 63.00
Vel Total (ft/s) 3.50 Avg. Vel. (ft/s) 3.50
Max Chl Dpth (ft) 0.69 Hydr. Depth (ft) 0.40
Conv. Total (cfs) 1249.1 Conv. (cfs) 1249.1
Length Wtd. (ft) 84.00 Wetted Per. (ft) 64.39
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.12
Alpha 1.00 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.27 Cum Volume (acre-ft) 0.00 0.22 0.01
C & E Loss (ft) 0.05 Cum SA (acres) 0.03 0.81 0.05
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #10-YR
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Page 23 of 28
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4983.47 Element Left OB Channel Right OB
Vel Head (ft) 0.25 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4983.23 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4983.23 Flow Area (sq ft) 6.68 36.16 5.21
E.G. Slope (ft/ft) 0.004107 Area (sq ft) 6.68 36.16 5.21
Q Total (cfs) 175.00 Flow (cfs) 11.40 151.84 11.75
Top Width (ft) 93.00 Top Width (ft) 22.00 60.00 11.00
Vel Total (ft/s) 3.64 Avg. Vel. (ft/s) 1.71 4.20 2.26
Max Chl Dpth (ft) 1.03 Hydr. Depth (ft) 0.30 0.60 0.47
Conv. Total (cfs) 2730.6 Conv. (cfs) 177.9 2369.3 183.4
Length Wtd. (ft) 130.00 Wetted Per. (ft) 22.23 61.03 11.42
Min Ch El (ft) 4982.20 Shear (lb/sq ft) 0.08 0.15 0.12
Alpha 1.19 Stream Power (lb/ft s) 236.00 0.00 0.00
Frctn Loss (ft) 0.55 Cum Volume (acre-ft) 0.01 0.09 0.01
C & E Loss (ft) 0.00 Cum SA (acres) 0.04 0.18 0.03
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The cross-section end points had to be extended vertically for the computed water
surface.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4984.21 Element Left OB Channel Right OB
Vel Head (ft) 0.40 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4983.81 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4983.81 Flow Area (sq ft) 19.44 70.97 29.92
E.G. Slope (ft/ft) 0.002965 Area (sq ft) 19.44 70.97 29.92
Q Total (cfs) 502.00 Flow (cfs) 56.54 396.83 48.63
Top Width (ft) 165.54 Top Width (ft) 22.00 60.00 83.54
Vel Total (ft/s) 4.17 Avg. Vel. (ft/s) 2.91 5.59 1.63
Max Chl Dpth (ft) 1.61 Hydr. Depth (ft) 0.88 1.18 0.36
Conv. Total (cfs) 9219.9 Conv. (cfs) 1038.4 7288.3 893.2
Length Wtd. (ft) 130.00 Wetted Per. (ft) 22.81 61.03 84.04
Min Ch El (ft) 4982.20 Shear (lb/sq ft) 0.16 0.22 0.07
Alpha 1.49 Stream Power (lb/ft s) 236.00 0.00 0.00
Frctn Loss (ft) 0.42 Cum Volume (acre-ft) 0.03 0.17 0.06
C & E Loss (ft) 0.01 Cum SA (acres) 0.04 0.18 0.14
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Page 27 of 28
Howes to Whit. 766 100-YR 502.00 4980.24 4981.43 4981.87
4982.84 0.016597 9.88 55.58 78.66 1.99
Howes to Whit. 896 2-YR 69.00 4982.20 4982.95 4982.95
4983.11 0.005654 3.28 22.99 80.28 1.01
Howes to Whit. 896 10-YR 175.00 4982.20 4983.23 4983.23
4983.47 0.004107 4.20 48.05 93.00 0.95
Howes to Whit. 896 100-YR 502.00 4982.20 4983.81 4983.81
4984.21 0.002965 5.59 120.32 165.54 0.91
Howes to Whit. 1017 2-YR 69.00 4983.00 4983.39 4983.28
4983.42 0.001557 1.57 43.95 214.76 0.52
Howes to Whit. 1017 10-YR 175.00 4983.00 4983.66 4983.45
4983.72 0.001192 1.90 92.02 345.10 0.50
Howes to Whit. 1017 100-YR 502.00 4983.00 4984.30 4983.81
4984.36 0.000534 1.94 258.71 662.99 0.37
Howes to Whit. 1101 2-YR 88.00 4983.25 4983.94 4983.94
4984.13 0.004963 3.50 25.16 63.00 0.98
Howes to Whit. 1101 10-YR 188.00 4983.25 4984.19 4984.19
4984.52 0.004366 4.55 42.01 71.16 0.99
Howes to Whit. 1101 100-YR 492.00 4983.25 4984.73 4984.80
4985.36 0.003921 6.42 86.02 93.60 1.04
Howes to Whit. 1218 2-YR 88.00 4983.25 4984.37 4984.52
4984.81 0.011986 5.35 17.49 48.08 1.51
Howes to Whit. 1218 10-YR 188.00 4983.25 4984.62 4984.80
4985.25 0.012175 6.43 32.00 67.14 1.59
Howes to Whit. 1218 100-YR 492.00 4983.25 4985.07 4985.44
4986.23 0.009811 8.80 65.89 94.07 1.58
Howes to Whit. 1398 2-YR 88.00 4985.25 4986.16 4986.16
4986.35 0.004915 3.54 25.88 75.35 0.97
Howes to Whit. 1398 10-YR 188.00 4985.25 4986.43 4986.43
4986.71 0.003782 4.37 48.74 102.75 0.93
Howes to Whit. 1398 100-YR 492.00 4985.25 4986.97 4986.97
4987.49 0.003307 6.03 97.90 157.35 0.96
Howes to Whit. 1599 2-YR 1.00 4986.50 4986.70 4986.64
4986.71 0.001045 0.58 1.72 19.89 0.35
Howes to Whit. 1599 10-YR 31.00 4986.50 4987.10 4986.98
4987.14 0.001374 1.63 19.06 57.74 0.50
Howes to Whit. 1599 100-YR 133.00 4986.50 4987.70 4987.32
4987.78 0.000780 2.42 63.65 211.78 0.44
Howes to Whit. 1791 2-YR 1.00 4987.80 4988.05 4988.05
4988.10 0.011648 1.75 0.57 7.58 1.12
Howes to Whit. 1791 10-YR 31.00 4987.80 4988.45 4988.45
4988.58 0.006755 2.95 10.53 42.94 1.05
Howes to Whit. 1791 100-YR 133.00 4987.80 4988.75 4988.84
4989.13 0.008260 4.99 28.07 82.15 1.29
Howes to Whit. 1975 2-YR 1.00 4990.10 4990.20 4990.23
4990.31 0.048454 2.76 0.41 8.33 2.18
Howes to Whit. 1975 10-YR 31.00 4990.10 4990.52 4990.61
4990.86 0.021619 4.81 7.34 35.12 1.85
Howes to Whit. 1975 100-YR 133.00 4990.10 4990.84 4991.01
4991.47 0.018484 6.52 23.21 62.45 1.89
Howes to Whit. 2093 2-YR 20.00 4991.50 4992.17 4992.24
4992.40 0.012077 3.84 5.21 21.67 1.38
Howes to Whit. 2093 10-YR 63.00 4991.50 4992.44 4992.55
4992.78 0.010820 4.75 14.61 49.83 1.40
Howes to Whit. 2093 100-YR 181.00 4991.50 4992.72 4992.92
4993.36 0.013539 6.62 33.79 92.12 1.66
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Page 2 of 28
Critical depth computed at all cross sections
Conveyance Calculation Method: At breaks in n values only
Friction Slope Method: Program Selects Appropriate method
Computational Flow Regime: Mixed Flow
FLOW DATA
Flow Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Flow File : C:\temp\940-002\CE\Laporte_CE.f02
Flow Data (cfs)
River Reach RS 2-YR 10-YR 100-YR
Laporte Howes to Whit. 2723 44 97 256
Laporte Howes to Whit. 2477 20 63 181
Laporte Howes to Whit. 1975 1 31 133
Laporte Howes to Whit. 1398 88 188 492
Laporte Howes to Whit. 1017 69 175 502
Boundary Conditions
River Reach Profile Upstream
Downstream
Laporte Howes to Whit. 2-YR Normal S = 0.008 Normal S
= 0.01
Laporte Howes to Whit. 10-YR Normal S = 0.008 Normal S
= 0.01
Laporte Howes to Whit. 100-YR Normal S = 0.008 Known WS =
4980.06
GEOMETRY DATA
Geometry Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : C:\temp\940-002\CE\Laporte_CE.g02
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2723
INPUT
Description: Laporte between Whitcomb and Loomis
The floodplain at this
cross-section was plotted based on an interpolated gutter flowline
elevation and a field measured curb height. See project
description for further details.
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5005.1 10.7 5005 54.9 5004.4 55 5003.6 82.2 5004
85 5004.1 86.5 5004 114.2 5003.2 114.3 5004 124.3 5004
144.1 5004.8
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 54.9 .016 114.3 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
54.9 114.3 132 132 132 .1 .3
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Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 38.2 5015 F
129.9 144.1 5015 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 5004.11 Element Left OB Channel Right OB
Vel Head (ft) 0.18 Wt. n-Val. 0.016
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E.G. Elev (ft) 5001.10 Element Left OB Channel Right OB
Vel Head (ft) 0.48 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5000.62 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5000.78 Flow Area (sq ft) 3.56 0.28
E.G. Slope (ft/ft) 0.022342 Area (sq ft) 3.56 0.28
Q Total (cfs) 20.00 Flow (cfs) 19.84 0.16
Top Width (ft) 18.33 Top Width (ft) 13.71 4.62
Vel Total (ft/s) 5.21 Avg. Vel. (ft/s) 5.57 0.56
Max Chl Dpth (ft) 0.52 Hydr. Depth (ft) 0.26 0.06
Conv. Total (cfs) 133.8 Conv. (cfs) 132.8 1.0
Length Wtd. (ft) 176.00 Wetted Per. (ft) 14.03 4.62
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.35 0.08
Alpha 1.13 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.82 Cum Volume (acre-ft) 0.02 0.44 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.08 1.54 0.11
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5001.60 Element Left OB Channel Right OB
Vel Head (ft) 0.69 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5000.91 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5001.20 Flow Area (sq ft) 8.62 3.23
E.G. Slope (ft/ft) 0.018579 Area (sq ft) 8.62 3.23
Q Total (cfs) 63.00 Flow (cfs) 59.15 3.85
Top Width (ft) 37.13 Top Width (ft) 21.29 15.84
Vel Total (ft/s) 5.31 Avg. Vel. (ft/s) 6.86 1.19
Max Chl Dpth (ft) 0.81 Hydr. Depth (ft) 0.41 0.21
Conv. Total (cfs) 462.2 Conv. (cfs) 434.0 28.2
Length Wtd. (ft) 176.00 Wetted Per. (ft) 21.62 15.41
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.46 0.24
Alpha 1.57 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.60 Cum Volume (acre-ft) 0.05 1.00 0.06
C & E Loss (ft) 0.04 Cum SA (acres) 0.20 2.45 0.26
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5001.99 Element Left OB Channel Right OB
Vel Head (ft) 0.72 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 5001.27 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5001.50 Flow Area (sq ft) 0.58 21.80 8.80
E.G. Slope (ft/ft) 0.023719 Area (sq ft) 0.58 21.80 11.77
Q Total (cfs) 181.00 Flow (cfs) 0.43 157.46 23.11
Top Width (ft) 99.09 Top Width (ft) 6.80 60.40 31.89
Vel Total (ft/s) 5.81 Avg. Vel. (ft/s) 0.74 7.22 2.63
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Page 10 of 28
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4993.36 Element Left OB Channel Right OB
Vel Head (ft) 0.64 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4992.72 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.92 Flow Area (sq ft) 6.84 25.78 1.17
E.G. Slope (ft/ft) 0.013539 Area (sq ft) 7.57 25.78 1.17
Q Total (cfs) 181.00 Flow (cfs) 9.63 170.59 0.78
Top Width (ft) 92.12 Top Width (ft) 29.01 52.55 10.55
Vel Total (ft/s) 5.36 Avg. Vel. (ft/s) 1.41 6.62 0.66
Max Chl Dpth (ft) 1.22 Hydr. Depth (ft) 0.34 0.49 0.11
Conv. Total (cfs) 1555.5 Conv. (cfs) 82.8 1466.1 6.7
Length Wtd. (ft) 118.00 Wetted Per. (ft) 20.00 53.81 10.55
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.29 0.40 0.09
Alpha 1.44 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 4.00 Cum Volume (acre-ft) 0.31 2.33 0.30
C & E Loss (ft) 0.12 Cum SA (acres) 0.89 3.08 0.90
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1975
INPUT
Description: East of Sherwood and Laporte intersection
Station Elevation Data num= 7
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4991.1 11.9 4991 17.5 4990.1 43.1 4990.9 73.6 4990.1
80.5 4991 107.9 4991.6
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 17.5 .016 73.6 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
17.5 73.6 184 184 184 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5001 F
91.2 107.9 5001 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4990.31 Element Left OB Channel Right OB
Vel Head (ft) 0.11 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.20 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4990.23 Flow Area (sq ft) 0.03 0.34 0.04
E.G. Slope (ft/ft) 0.048454 Area (sq ft) 0.03 0.34 0.04
Q Total (cfs) 1.00 Flow (cfs) 0.02 0.95 0.03
Top Width (ft) 8.33 Top Width (ft) 0.62 6.95 0.76
Vel Total (ft/s) 2.42 Avg. Vel. (ft/s) 0.73 2.76 0.73
Max Chl Dpth (ft) 0.10 Hydr. Depth (ft) 0.05 0.05 0.05
Conv. Total (cfs) 4.5 Conv. (cfs) 0.1 4.3 0.1
Length Wtd. (ft) 184.00 Wetted Per. (ft) 0.62 6.96 0.77
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.15 0.15 0.15
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 2.08 Cum Volume (acre-ft) 0.02 0.40 0.01
C & E Loss (ft) 0.05 Cum SA (acres) 0.08 1.36 0.10
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
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Page 14 of 28
RIVER: Laporte
REACH: Howes to Whit. RS: 1599
INPUT
Description: West of Meldrum and Laporte intersection
Station Elevation Data num= 13
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988 337.6 4987.3 382 4987.3 382.1 4986.5 417.5 4987
439.7 4986.6 439.8 4987.4 469.3 4987.7 484.2 4988 505.4 4988
528.6 4987.3 562.7 4987.3 571.1 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 382 .016 439.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
382 439.8 201 201 201 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 365.3 4997 F
456.8 571.1 4997 F
Blocked Obstructions num= 5
Sta L Sta R Elev Sta L Sta R Elev Sta L Sta R Elev
142.5 192.7 4998 204.6 233.9 4998 284.7 337.6 4998
469.3 510.1 4998 528.6 562.7 4998
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4986.71 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.016
W.S. Elev (ft) 4986.70 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4986.64 Flow Area (sq ft) 1.72
E.G. Slope (ft/ft) 0.001045 Area (sq ft) 1.72
Q Total (cfs) 1.00 Flow (cfs) 1.00
Top Width (ft) 19.89 Top Width (ft) 19.89
Vel Total (ft/s) 0.58 Avg. Vel. (ft/s) 0.58
Max Chl Dpth (ft) 0.20 Hydr. Depth (ft) 0.09
Conv. Total (cfs) 30.9 Conv. (cfs) 30.9
Length Wtd. (ft) 201.00 Wetted Per. (ft) 20.16
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.01
Alpha 1.00 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.35 Cum Volume (acre-ft) 0.02 0.39 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.08 1.27 0.10
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4987.14 Element Left OB Channel Right OB
Vel Head (ft) 0.04 Wt. n-Val. 0.016
W.S. Elev (ft) 4987.10 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4986.98 Flow Area (sq ft) 19.06
E.G. Slope (ft/ft) 0.001374 Area (sq ft) 19.06
Q Total (cfs) 31.00 Flow (cfs) 31.00
Top Width (ft) 57.74 Top Width (ft) 57.74
Vel Total (ft/s) 1.63 Avg. Vel. (ft/s) 1.63
Max Chl Dpth (ft) 0.60 Hydr. Depth (ft) 0.33
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Page 18 of 28
Vel Total (ft/s) 5.03 Avg. Vel. (ft/s) 0.88 5.35
Max Chl Dpth (ft) 1.12 Hydr. Depth (ft) 0.19 0.39
Conv. Total (cfs) 803.8 Conv. (cfs) 10.0 793.7
Length Wtd. (ft) 117.00 Wetted Per. (ft) 6.71 42.53
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.14 0.29
Alpha 1.12 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.52 Cum Volume (acre-ft) 0.01 0.25 0.00
C & E Loss (ft) 0.02 Cum SA (acres) 0.06 0.88 0.04
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4985.25 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4984.62 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4984.80 Flow Area (sq ft) 3.45 28.55
E.G. Slope (ft/ft) 0.012175 Area (sq ft) 3.45 28.55
Q Total (cfs) 188.00 Flow (cfs) 4.31 183.69
Top Width (ft) 67.14 Top Width (ft) 11.14 56.00
Vel Total (ft/s) 5.87 Avg. Vel. (ft/s) 1.25 6.43
Max Chl Dpth (ft) 1.37 Hydr. Depth (ft) 0.31 0.51
Conv. Total (cfs) 1703.8 Conv. (cfs) 39.1 1664.8
Length Wtd. (ft) 117.00 Wetted Per. (ft) 11.16 57.41
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.23 0.38
Alpha 1.17 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.44 Cum Volume (acre-ft) 0.03 0.50 0.01
C & E Loss (ft) 0.03 Cum SA (acres) 0.09 1.21 0.06
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4986.23 Element Left OB Channel Right OB
Vel Head (ft) 1.16 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4985.07 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4985.44 Flow Area (sq ft) 10.35 53.88 1.67
E.G. Slope (ft/ft) 0.009811 Area (sq ft) 10.35 53.88 1.67
Q Total (cfs) 492.00 Flow (cfs) 16.43 474.33 1.24
Top Width (ft) 94.07 Top Width (ft) 19.85 56.00 18.21
Vel Total (ft/s) 7.47 Avg. Vel. (ft/s) 1.59 8.80 0.75
Max Chl Dpth (ft) 1.82 Hydr. Depth (ft) 0.52 0.96 0.09
Conv. Total (cfs) 4967.1 Conv. (cfs) 165.8 4788.7 12.6
Length Wtd. (ft) 117.00 Wetted Per. (ft) 19.88 57.54 18.24
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.32 0.57 0.06
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Page 22 of 28
Top Width (ft) 622.13 Top Width (ft) 622.13
Vel Total (ft/s) 2.15 Avg. Vel. (ft/s) 2.15
Max Chl Dpth (ft) 1.21 Hydr. Depth (ft) 0.78
Conv. Total (cfs) 18279.0 Conv. (cfs) 18279.0
Length Wtd. (ft) 121.00 Wetted Per. (ft) 301.01
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.04
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.15 Cum Volume (acre-ft) 0.07 0.82 0.07
C & E Loss (ft) 0.04 Cum SA (acres) 0.08 1.13 0.20
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 896
INPUT
Description: Cross section 8+96
Station Elevation Data num= 14
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4985 .01 4982.98 19.62 4982.23 19.63 4981.76 21.53 4981.9
49.63 4982.93 77.63 4982.37 79.63 4982.2 79.63 4982.7 90.63 4982.81
90.63 4983.31 91.63 4983.31 190.63 4984 233.63 4985
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 19.62 .016 79.63 .025
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
19.62 79.63 130 130 130 .1 .3
Blocked Obstructions num= 1
Sta L Sta R Elev
0 0 4990
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4982.96 Element Left OB Channel Right OB
Vel Head (ft) 0.16 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4982.80 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4982.80 Flow Area (sq ft) 4.23 18.49 0.49
E.G. Slope (ft/ft) 0.004883 Area (sq ft) 4.23 18.49 0.49
Q Total (cfs) 69.00 Flow (cfs) 7.60 61.13 0.27
Top Width (ft) 74.61 Top Width (ft) 14.87 49.86 9.88
Vel Total (ft/s) 2.97 Avg. Vel. (ft/s) 1.80 3.31 0.56
Max Chl Dpth (ft) 1.04 Hydr. Depth (ft) 0.28 0.37 0.05
Conv. Total (cfs) 987.4 Conv. (cfs) 108.7 874.8 3.9
Length Wtd. (ft) 130.00 Wetted Per. (ft) 14.88 50.85 9.88
Min Ch El (ft) 4981.76 Shear (lb/sq ft) 0.09 0.11 0.02
Alpha 1.14 Stream Power (lb/ft s) 233.63 0.00 0.00
Frctn Loss (ft) 0.63 Cum Volume (acre-ft) 0.01 0.05 0.00
C & E Loss (ft) 0.00 Cum SA (acres) 0.03 0.14 0.03
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
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Page 26 of 28
SUMMARY OF REACH LENGTHS
River: Laporte
Reach River Sta. Left Channel Right
Howes to Whit. 2723 132 132 132
Howes to Whit. 2591 114 114 114
Howes to Whit. 2477 176 176 176
Howes to Whit. 2301 208 208 208
Howes to Whit. 2093 118 118 118
Howes to Whit. 1975 184 184 184
Howes to Whit. 1791 192 192 192
Howes to Whit. 1599 201 201 201
Howes to Whit. 1398 180 180 180
Howes to Whit. 1218 117 117 117
Howes to Whit. 1101 84 84 84
Howes to Whit. 1017 121 121 121
Howes to Whit. 896 130 130 130
Howes to Whit. 766
SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS
River: Laporte
Reach River Sta. Contr. Expan.
Howes to Whit. 2723 .1 .3
Howes to Whit. 2591 .1 .3
Howes to Whit. 2477 .1 .3
Howes to Whit. 2301 .1 .3
Howes to Whit. 2093 .1 .3
Howes to Whit. 1975 .1 .3
Howes to Whit. 1791 .1 .3
Howes to Whit. 1599 .1 .3
Howes to Whit. 1398 .1 .3
Howes to Whit. 1218 .1 .3
Howes to Whit. 1101 .1 .3
Howes to Whit. 1017 .1 .3
Howes to Whit. 896 .1 .3
Howes to Whit. 766 .1 .3
Profile Output Table - Standard Table 1
Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G.
Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl
(cfs) (ft) (ft) (ft)
(ft) (ft/ft) (ft/s) (sq ft) (ft)
Howes to Whit. 766 2-YR 69.00 4980.00 4980.80 4980.96
4981.26 0.020622 5.52 13.01 56.82 1.86
Howes to Whit. 766 10-YR 175.00 4980.00 4981.01 4981.22
4981.70 0.019634 6.89 27.72 78.19 1.94
Howes to Whit. 766 100-YR 502.00 4980.00 4981.37 4981.79
4982.73 0.016483 9.79 57.32 83.70 1.98
Howes to Whit. 896 2-YR 69.00 4981.76 4982.80 4982.80
4982.96 0.004883 3.31 23.21 74.61 0.96
Howes to Whit. 896 10-YR 175.00 4981.76 4983.07 4983.07
4983.32 0.004783 4.33 46.27 90.62 1.02
Howes to Whit. 896 100-YR 502.00 4981.76 4983.66 4983.66
4984.10 0.003213 5.76 109.86 142.42 0.94
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Page 27 of 28
Howes to Whit. 1017 2-YR 69.00 4983.00 4983.34 4983.28
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Page 1 of 28
HEC-RAS Version 4.1.0 Jan 2010
U.S. Army Corps of Engineers
Hydrologic Engineering Center
609 Second Street
Davis, California
X X XXXXXX XXXX XXXX XX XXXX
X X X X X X X X X X
X X X X X X X X X
XXXXXXX XXXX X XXX XXXX XXXXXX XXXX
X X X X X X X X X
X X X X X X X X X X
X X XXXXXX XXXX X X X X XXXXX
PROJECT DATA
Project Title: Laporte Street Hydraulics
Project File : Laporte_PC.prj
Run Date and Time: 4/28/2015 1:25:51 PM
Project in English units
Project Description:
Laporte Street Floodplain Model
For this hydraulic model, the gutter flowline
elevation was determined based on interpolation of the available topography in
the street. The measured curb height was then added to this elev. to determine
the elev. of the top of the curb. At some locations, this elev. was higher then
the adjacent contour behind the curb, a condition that does not reflect actual
ground conditions, so the adjacent contour behind the curb was disregarded with
ground elevations in the model defined by skipping to the next available
contour. The floodplain was plotted using this info, and at some locations
(XS's 2723 & 2591) is plotted entirely in the gutter instead of showing the
flow leaving the street, contrary to what an initial look at the WSEL and the
contours would indicate.
PLAN DATA
Plan Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Plan File : C:\temp\940-002\PC\Laporte_PC.p02
Geometry Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : C:\temp\940-002\PC\Laporte_PC.g02
Flow Title : Laporte - 2-, 10-, and 100-YR Flows (no splits)
Flow File : C:\temp\940-002\PC\Laporte_PC.f02
Plan Summary Information:
Number of: Cross Sections = 14 Multiple Openings = 0
Culverts = 0 Inline Structures = 0
Bridges = 0 Lateral Structures = 0
Computational Information
Water surface calculation tolerance = 0.01
Critical depth calculation tolerance = 0.01
Maximum number of iterations = 20
Maximum difference tolerance = 0.3
Flow tolerance factor = 0.001
Computation Options
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Page 2 of 28
Critical depth computed at all cross sections
Conveyance Calculation Method: At breaks in n values only
Friction Slope Method: Program Selects Appropriate method
Computational Flow Regime: Mixed Flow
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Top Width (ft) 65.92 Top Width (ft) 58.75 7.17
Vel Total (ft/s) 4.39 Avg. Vel. (ft/s) 4.53 0.54
Max Chl Dpth (ft) 1.01 Hydr. Depth (ft) 0.36 0.11
Conv. Total (cfs) 998.7 Conv. (cfs) 994.4 4.2
Length Wtd. (ft) 114.00 Wetted Per. (ft) 59.84 7.18
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.21 0.06
Alpha 1.06 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.15 Cum Volume (acre-ft) 0.06 1.05 0.06
C & E Loss (ft) 0.00 Cum SA (acres) 0.24 2.58 0.29
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5003.86 Element Left OB Channel Right OB
Vel Head (ft) 0.66 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5003.20 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5003.38 Flow Area (sq ft) 38.36 4.39
E.G. Slope (ft/ft) 0.009079 Area (sq ft) 38.36 4.71
Q Total (cfs) 256.00 Flow (cfs) 251.52 4.48
Top Width (ft) 80.13 Top Width (ft) 58.79 21.35
Vel Total (ft/s) 5.99 Avg. Vel. (ft/s) 6.56 1.02
Max Chl Dpth (ft) 1.30 Hydr. Depth (ft) 0.65 0.28
Conv. Total (cfs) 2686.6 Conv. (cfs) 2639.6 47.1
Length Wtd. (ft) 114.00 Wetted Per. (ft) 60.13 15.41
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.36 0.16
Alpha 1.18 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.13 Cum Volume (acre-ft) 0.35 2.58 0.36
C & E Loss (ft) 0.01 Cum SA (acres) 1.02 3.71 1.12
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2477
INPUT
Description: East of Whitcomb and Laporte intersection
Station Elevation Data num= 8
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5001.5 16 5001.1 46.5 5001.2 52.7 5001 76.3 5000.1
76.4 5000.5 95.8 5001 114.3 5001.4
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 16 .016 76.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
16 76.4 176 176 176 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5011 F
91.8 114.3 5011 F
CROSS SECTION OUTPUT Profile #2-YR
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Page 9 of 28
0 .06 51.5 .016 108.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
51.5 108.4 118 118 118 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 31.5 5003 F
124.5 144.2 5003 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4992.40 Element Left OB Channel Right OB
Vel Head (ft) 0.23 Wt. n-Val. 0.016
W.S. Elev (ft) 4992.17 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.24 Flow Area (sq ft) 5.21
E.G. Slope (ft/ft) 0.012077 Area (sq ft) 5.21
Q Total (cfs) 20.00 Flow (cfs) 20.00
Top Width (ft) 21.67 Top Width (ft) 21.67
Vel Total (ft/s) 3.84 Avg. Vel. (ft/s) 3.84
Max Chl Dpth (ft) 0.67 Hydr. Depth (ft) 0.24
Conv. Total (cfs) 182.0 Conv. (cfs) 182.0
Length Wtd. (ft) 118.00 Wetted Per. (ft) 22.59
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.17
Alpha 1.00 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 3.97 Cum Volume (acre-ft) 0.02 0.41 0.01
C & E Loss (ft) 0.11 Cum SA (acres) 0.11 1.42 0.09
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4992.78 Element Left OB Channel Right OB
Vel Head (ft) 0.35 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4992.44 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.55 Flow Area (sq ft) 1.55 13.06
E.G. Slope (ft/ft) 0.010820 Area (sq ft) 1.55 13.06
Q Total (cfs) 63.00 Flow (cfs) 0.96 62.04
Top Width (ft) 49.83 Top Width (ft) 13.15 36.68
Vel Total (ft/s) 4.31 Avg. Vel. (ft/s) 0.62 4.75
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.12 0.36
Conv. Total (cfs) 605.7 Conv. (cfs) 9.3 596.4
Length Wtd. (ft) 118.00 Wetted Per. (ft) 13.15 37.87
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.08 0.23
Alpha 1.20 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 4.01 Cum Volume (acre-ft) 0.06 0.92 0.05
C & E Loss (ft) 0.14 Cum SA (acres) 0.21 2.20 0.23
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
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Page 13 of 28
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4988.58 Element Left OB Channel Right OB
Vel Head (ft) 0.13 Wt. n-Val. 0.016
W.S. Elev (ft) 4988.45 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.45 Flow Area (sq ft) 10.53
E.G. Slope (ft/ft) 0.006755 Area (sq ft) 10.53
Q Total (cfs) 31.00 Flow (cfs) 31.00
Top Width (ft) 42.94 Top Width (ft) 42.94
Vel Total (ft/s) 2.95 Avg. Vel. (ft/s) 2.95
Max Chl Dpth (ft) 0.65 Hydr. Depth (ft) 0.25
Conv. Total (cfs) 377.2 Conv. (cfs) 377.2
Length Wtd. (ft) 192.00 Wetted Per. (ft) 43.92
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.10
Alpha 1.00 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 0.78 Cum Volume (acre-ft) 0.05 0.86 0.05
C & E Loss (ft) 0.03 Cum SA (acres) 0.18 1.96 0.22
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4989.13 Element Left OB Channel Right OB
Vel Head (ft) 0.38 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4988.75 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.84 Flow Area (sq ft) 1.58 26.50
E.G. Slope (ft/ft) 0.008260 Area (sq ft) 1.83 26.50
Q Total (cfs) 133.00 Flow (cfs) 0.76 132.24
Top Width (ft) 82.15 Top Width (ft) 25.26 56.89
Vel Total (ft/s) 4.74 Avg. Vel. (ft/s) 0.48 4.99
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.10 0.47
Conv. Total (cfs) 1463.4 Conv. (cfs) 8.4 1455.1
Length Wtd. (ft) 192.00 Wetted Per. (ft) 15.90 58.28
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.05 0.23
Alpha 1.10 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 2.27 Cum Volume (acre-ft) 0.31 2.14 0.29
C & E Loss (ft) 0.07 Cum SA (acres) 0.82 2.69 0.87
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
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Page 17 of 28
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4987.49 Element Left OB Channel Right OB
Vel Head (ft) 0.51 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.97 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.97 Flow Area (sq ft) 7.11 73.72 17.07
E.G. Slope (ft/ft) 0.003307 Area (sq ft) 7.11 73.72 40.08
Q Total (cfs) 492.00 Flow (cfs) 15.02 444.17 32.81
Top Width (ft) 157.35 Top Width (ft) 14.60 60.00 82.74
Vel Total (ft/s) 5.03 Avg. Vel. (ft/s) 2.11 6.03 1.92
Max Chl Dpth (ft) 1.72 Hydr. Depth (ft) 0.49 1.23 0.85
Conv. Total (cfs) 8555.0 Conv. (cfs) 261.1 7723.3 570.6
Length Wtd. (ft) 180.00 Wetted Per. (ft) 14.64 61.53 20.00
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.10 0.25 0.18
Alpha 1.31 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.58 Cum Volume (acre-ft) 0.16 1.67 0.17
C & E Loss (ft) 0.00 Cum SA (acres) 0.25 2.17 0.47
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1218
INPUT
Description: Cross Section 12+18
Station Elevation Data num= 13
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 26 4985 44 4984 44 4983.25 71 4984.58
100 4984 100 4984.75 103 4985 112 4985 118 4985
121 4986 170 4987 197 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 44 .016 100 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
44 100 117 117 117 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
121 197 4995 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4984.81 Element Left OB Channel Right OB
Vel Head (ft) 0.44 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4984.37 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4984.52 Flow Area (sq ft) 1.25 16.24
E.G. Slope (ft/ft) 0.011986 Area (sq ft) 1.25 16.24
Q Total (cfs) 88.00 Flow (cfs) 1.10 86.90
Top Width (ft) 48.08 Top Width (ft) 6.70 41.38
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 21 of 28
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .016 0 .016 814.8 .016
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
0 814.8 121 121 121 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 375.2 4990 F
676.2 814.8 4990 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4983.40 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.35 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.28 Flow Area (sq ft) 38.25
E.G. Slope (ft/ft) 0.002437 Area (sq ft) 41.71
Q Total (cfs) 69.00 Flow (cfs) 69.00
Top Width (ft) 201.49 Top Width (ft) 201.49
Vel Total (ft/s) 1.80 Avg. Vel. (ft/s) 1.80
Max Chl Dpth (ft) 0.35 Hydr. Depth (ft) 0.25
Conv. Total (cfs) 1397.7 Conv. (cfs) 1397.7
Length Wtd. (ft) 121.00 Wetted Per. (ft) 154.95
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.04
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.39 Cum Volume (acre-ft) 0.01 0.13 0.00
C & E Loss (ft) 0.01 Cum SA (acres) 0.07 0.50 0.03
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4983.68 Element Left OB Channel Right OB
Vel Head (ft) 0.07 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.60 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.45 Flow Area (sq ft) 80.84
E.G. Slope (ft/ft) 0.001700 Area (sq ft) 106.14
Q Total (cfs) 175.00 Flow (cfs) 175.00
Top Width (ft) 315.93 Top Width (ft) 315.93
Vel Total (ft/s) 2.16 Avg. Vel. (ft/s) 2.16
Max Chl Dpth (ft) 0.60 Hydr. Depth (ft) 0.43
Conv. Total (cfs) 4244.1 Conv. (cfs) 4244.1
Length Wtd. (ft) 121.00 Wetted Per. (ft) 190.18
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.05
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.30 Cum Volume (acre-ft) 0.04 0.28 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.11 0.70 0.05
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4984.27 Element Left OB Channel Right OB
Vel Head (ft) 0.07 Wt. n-Val. 0.016
W.S. Elev (ft) 4984.20 Reach Len. (ft) 121.00 121.00 121.00
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 25 of 28
Length Wtd. (ft) Wetted Per. (ft) 13.60 60.74 11.15
Min Ch El (ft) 4979.93 Shear (lb/sq ft) 0.35 0.48 0.25
Alpha 1.15 Stream Power (lb/ft s) 118.22 0.00 0.00
Frctn Loss (ft) 1.66 Cum Volume (acre-ft)
C & E Loss (ft) 0.04 Cum SA (acres)
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4982.65 Element Left OB Channel Right OB
Vel Head (ft) 1.32 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4981.32 Reach Len. (ft)
Crit W.S. (ft) 4981.71 Flow Area (sq ft) 9.92 43.31 5.95
E.G. Slope (ft/ft) 0.017546 Area (sq ft) 9.92 43.31 5.95
Q Total (cfs) 502.00 Flow (cfs) 46.53 425.25 30.22
Top Width (ft) 92.21 Top Width (ft) 21.50 59.71 11.00
Vel Total (ft/s) 8.48 Avg. Vel. (ft/s) 4.69 9.82 5.08
Max Chl Dpth (ft) 1.39 Hydr. Depth (ft) 0.46 0.73 0.54
Conv. Total (cfs) 3789.8 Conv. (cfs) 351.3 3210.4 228.1
Length Wtd. (ft) Wetted Per. (ft) 21.55 60.74 11.50
Min Ch El (ft) 4979.93 Shear (lb/sq ft) 0.50 0.78 0.57
Alpha 1.18 Stream Power (lb/ft s) 118.22 0.00 0.00
Frctn Loss (ft) 1.35 Cum Volume (acre-ft)
C & E Loss (ft) 0.09 Cum SA (acres)
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
SUMMARY OF MANNING'S N VALUES
River:Laporte
Reach River Sta. n1 n2 n3
Howes to Whit. 2723 .06 .016 .06
Howes to Whit. 2591 .06 .016 .06
Howes to Whit. 2477 .06 .016 .06
Howes to Whit. 2301 .06 .016 .06
Howes to Whit. 2093 .06 .016 .06
Howes to Whit. 1975 .06 .016 .06
Howes to Whit. 1791 .06 .016 .06
Howes to Whit. 1599 .06 .016 .06
Howes to Whit. 1398 .025 .016 .04
Howes to Whit. 1218 .06 .016 .04
Howes to Whit. 1101 .06 .016 .04
Howes to Whit. 1017 .016 .016 .016
Howes to Whit. 896 .025 .016 .025
Howes to Whit. 766 .025 .016 .025
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
T
S
T
ST
S
T
S
T
F
O
FO
FO FO FO FO FO FO
FO
FO FO
FO
FO FO FO F
O
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
SS SS SS SS SS SS SS SS SS
SS
S
T
S
T
S
T
SS SS SS SS SS SS SS SS SS SS
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
S
T
FO
FO
FO FO FO FO FO FO FO FO
FO FO FO
W
RD RD RD
RD
RD
S
F
S
F
S
F
S
F
S
F
S
F
S
F
S
F
SF SF SF SF SF SF SF SF SF SF SF SF
LAPORTE AVENUE
(100' ROW)
HOWES STREET
(100' ROW)
EXISTING
215 N. MASON BUILDING
EXISTING
214 N. HOWES BUILDING
P
R
O
P
O
SED
S
I
DEWA
LK
PROPOSED SIDEWALK
APPROXIMATE LOCATION
OF 16' WIDE x5' TALL
CONCRETE BOX CULVERT
P
R
O
P
O
SED
C
O
NCRE
T
E
T
ERRACE
(
R
E
:
LANDSCAPE ARCHI
T
EC
T
)
PROPOSED SIDEWALK
P
R
OPOSED
SIDE
W
A
LK
P
R
O
P
O
SED
SIDEWA
LK
PROPOSED
POROUS
LANDSCAPE
DETENTION
1
2
OS1
1
2
OS2
OS1
OS2
OS3
OS3
EXISTING RIGHT-OF-WAY
FUTURE PEDESTRIAN
WALKWAY PROPOSED STORM SEWER B
CONNECT PROPOSED STORM SEWER
INTO EXISTING BOX CULVERT
PROPOSED WATER QUALITY
OUTLET STRUCTURE
PROPOSED STORM SEWER A
PROPOSED STORM SEWER D
PROPOSED SIDEWALK
PROPOSED UTILITIES
ADMINISTRATION BUILDING
FF = 4985.50
RELOCATED
BUTTERFLY
BLDG
FF = 4984.0
4984
.
1
100
-
Y
R
F
L
OO
D
E
L
EVATIO
N
(
FT
.
C
O
LL
I
N
S
N
GV
D
29
)
EXISTING
RIGHT-OF-WAY
PROPOSED EMERGENCY
ACCESS ALIGNMENT
PROPOSED STORM SEWER C
OS4
OS4
RS
RS
RS
RS
RS RS
RS RS
RS
RW RW
RW
RS
RS
RS
RS
VTC
IP
IP
SF
SF
SF
RW
CONTRACTOR TO PLACE VEHICLE
TRACKING PAD AT CONSTRUCTION
ENTRY (ASSUMED ON THIS PLAN TO
BE AT SITE NE CORNER)
PROPOSED STORM SEWER E
EXISTING
RIGHT-OF-WAY
EXISTING 100-YR CITY
HIGH RISK FLOOD FRINGE
EXISTING 100-YR
CITY FLOODWAY
EXISTING
RIGHT-OF-WAY
EXISTING STORM
SEWER MANHOLE (TYP.)
PROPOSED RAIN GARDEN
(RE: LANDSCAPE ARCHITECT)
PROPOSED RAIN GARDEN
(RE: LANDSCAPE ARCHITECT)
PROPOSED RAIN GARDEN
(RE: LANDSCAPE ARCHITECT)
Monday, April 14, 2014 10:17 AM
D:\Projects\940-002\Dwg\Drng\940-002_DRNG.dwg
Wegert Provencio
C600
DRAINAGE & EROSION
CONTROL PLAN
CITY OF FORT COLLINS
222 Laporte Avenue
Fort Collins, CO 80524
UTILITIES
ADMINISTRATION
BUILDING
PROJECT DEVELOPMENT PLAN
1050 17th STREET,
SUITE A200
DENVER, CO 80265
303 295 1717 t
303 292 0845 f
DRAWN BY: CHECKED BY:
A
B
C
D
E
F
G
H
I
J
A
B
C
D
E
F
G
H
I
J
1234567891011121314
14 13 12 11 10 9 8 7 6 5 4 3 2 1
15
15
K K
NRN O R T H E
NOTES:
A
B2
1.45 ac
N
O
T
FO
R
C
O
N
S
T
RUC
TIO
N
LEGEND:
( IN FEET )
10 0 10 20 30
1 INCH = 10 FEET
UD
ST
CALL 2 BUSINESS DAYS IN ADVANCE BEFORE YOU
DIG, GRADE, OR EXCAVATE FOR THE MARKING OF
UNDERGROUND MEMBER UTILITIES.
CALL UTILITY NOTIFICATION CENTER OF
COLORADO
R
PROJECT DATUM: NGVD29 Unadjusted (Old City of Fort Collins Datum)
BENCHMARK #1:
City of Fort Collins Benchmark 1-13
Southwest corner of College Avenue and Maple Street, on a concrete traffic signal base.
Elevation= 4976.58
NOTE: If NAVD 88 Datum is required for any purpose, the following equation should be
used: NAVD88 = NGVD29 Unadjusted + 3.17'
PROJECT BENCHMARKS:
SF
NOTE:
ALL BMP'S SHOWN ON THIS PLAN ARE GRAPHIC
REPRESENTATIONS ONLY. FINAL DETERMINATION OF SIZE
AND LOCATION SHALL BE DETERMINED BY THE CONTRACTOR.
TEMPORARY BMP'S
NORTHERN ENGINEERING; APRIL 15, 2015
Page 26 of 28
SUMMARY OF REACH LENGTHS
River: Laporte
Reach River Sta. Left Channel Right
Howes to Whit. 2723 132 132 132
Howes to Whit. 2591 114 114 114
Howes to Whit. 2477 176 176 176
Howes to Whit. 2301 208 208 208
Howes to Whit. 2093 118 118 118
Howes to Whit. 1975 184 184 184
Howes to Whit. 1791 192 192 192
Howes to Whit. 1599 201 201 201
Howes to Whit. 1398 180 180 180
Howes to Whit. 1218 117 117 117
Howes to Whit. 1101 84 84 84
Howes to Whit. 1017 121 121 121
Howes to Whit. 896 130 130 130
Howes to Whit. 766
SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS
River: Laporte
Reach River Sta. Contr. Expan.
Howes to Whit. 2723 .1 .3
Howes to Whit. 2591 .1 .3
Howes to Whit. 2477 .1 .3
Howes to Whit. 2301 .1 .3
Howes to Whit. 2093 .1 .3
Howes to Whit. 1975 .1 .3
Howes to Whit. 1791 .1 .3
Howes to Whit. 1599 .1 .3
Howes to Whit. 1398 .1 .3
Howes to Whit. 1218 .1 .3
Howes to Whit. 1101 .1 .3
Howes to Whit. 1017 .1 .3
Howes to Whit. 896 .1 .3
Howes to Whit. 766 .1 .3
Profile Output Table - Standard Table 1
Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G.
Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl
(cfs) (ft) (ft) (ft)
(ft) (ft/ft) (ft/s) (sq ft) (ft)
Howes to Whit. 766 2-YR 69.00 4979.93 4980.76 4980.92
4981.24 0.021878 5.71 12.81 52.07 1.92
Howes to Whit. 766 10-YR 175.00 4979.93 4980.97 4981.18
4981.65 0.020714 6.90 28.37 84.30 1.98
Howes to Whit. 766 100-YR 502.00 4979.93 4981.32 4981.71
4982.65 0.017546 9.82 59.18 92.21 2.03
Howes to Whit. 896 2-YR 69.00 4981.95 4982.86 4982.86
4983.01 0.004687 3.17 24.94 85.96 0.93
Howes to Whit. 896 10-YR 175.00 4981.95 4983.10 4983.10
4983.36 0.004766 4.32 48.09 100.81 1.02
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 27 of 28
Howes to Whit. 896 100-YR 502.00 4981.95 4983.67 4983.67
4984.08 0.003279 5.70 114.49 153.03 0.95
Howes to Whit. 1017 2-YR 69.00 4983.00 4983.35 4983.28
4983.40 0.002437 1.80 38.25 201.49 0.64
Howes to Whit. 1017 10-YR 175.00 4983.00 4983.60 4983.45
4983.68 0.001700 2.16 80.84 315.93 0.59
Howes to Whit. 1017 100-YR 502.00 4983.00 4984.20 4983.81
4984.27 0.000807 2.20 228.58 614.57 0.44
Howes to Whit. 1101 2-YR 88.00 4983.25 4983.94 4983.94
4984.13 0.004963 3.50 25.16 63.00 0.98
Howes to Whit. 1101 10-YR 188.00 4983.25 4984.19 4984.19
4984.52 0.004366 4.55 42.01 71.16 0.99
Howes to Whit. 1101 100-YR 492.00 4983.25 4984.73 4984.80
4985.36 0.003921 6.42 86.02 93.60 1.04
Howes to Whit. 1218 2-YR 88.00 4983.25 4984.37 4984.52
4984.81 0.011986 5.35 17.49 48.08 1.51
Howes to Whit. 1218 10-YR 188.00 4983.25 4984.62 4984.80
4985.25 0.012175 6.43 32.00 67.14 1.59
Howes to Whit. 1218 100-YR 492.00 4983.25 4985.07 4985.44
4986.23 0.009811 8.80 65.89 94.07 1.58
Howes to Whit. 1398 2-YR 88.00 4985.25 4986.16 4986.16
4986.35 0.004915 3.54 25.88 75.35 0.97
Howes to Whit. 1398 10-YR 188.00 4985.25 4986.43 4986.43
4986.71 0.003782 4.37 48.74 102.75 0.93
Howes to Whit. 1398 100-YR 492.00 4985.25 4986.97 4986.97
4987.49 0.003307 6.03 97.90 157.35 0.96
Howes to Whit. 1599 2-YR 1.00 4986.50 4986.70 4986.64
4986.71 0.001045 0.58 1.72 19.89 0.35
Howes to Whit. 1599 10-YR 31.00 4986.50 4987.10 4986.98
4987.14 0.001374 1.63 19.06 57.74 0.50
Howes to Whit. 1599 100-YR 133.00 4986.50 4987.70 4987.32
4987.78 0.000780 2.42 63.65 211.78 0.44
Howes to Whit. 1791 2-YR 1.00 4987.80 4988.05 4988.05
4988.10 0.011648 1.75 0.57 7.58 1.12
Howes to Whit. 1791 10-YR 31.00 4987.80 4988.45 4988.45
4988.58 0.006755 2.95 10.53 42.94 1.05
Howes to Whit. 1791 100-YR 133.00 4987.80 4988.75 4988.84
4989.13 0.008260 4.99 28.07 82.15 1.29
Howes to Whit. 1975 2-YR 1.00 4990.10 4990.20 4990.23
4990.31 0.048454 2.76 0.41 8.33 2.18
Howes to Whit. 1975 10-YR 31.00 4990.10 4990.52 4990.61
4990.86 0.021619 4.81 7.34 35.12 1.85
Howes to Whit. 1975 100-YR 133.00 4990.10 4990.84 4991.01
4991.47 0.018484 6.52 23.21 62.45 1.89
Howes to Whit. 2093 2-YR 20.00 4991.50 4992.17 4992.24
4992.40 0.012077 3.84 5.21 21.67 1.38
Howes to Whit. 2093 10-YR 63.00 4991.50 4992.44 4992.55
4992.78 0.010820 4.75 14.61 49.83 1.40
Howes to Whit. 2093 100-YR 181.00 4991.50 4992.72 4992.92
4993.36 0.013539 6.62 33.79 92.12 1.66
Howes to Whit. 2301 2-YR 20.00 4995.40 4995.88 4996.07
4996.47 0.030108 6.13 3.26 13.47 2.20
Howes to Whit. 2301 10-YR 63.00 4995.40 4996.13 4996.36
4996.93 0.034385 7.18 8.79 32.87 2.41
Howes to Whit. 2301 100-YR 181.00 4995.40 4996.43 4996.73
4997.47 0.027272 8.25 23.75 66.63 2.29
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 28 of 28
Howes to Whit. 2477 2-YR 20.00 5000.10 5000.62 5000.78
5001.10 0.022342 5.57 3.84 18.33 1.92
Howes to Whit. 2477 10-YR 63.00 5000.10 5000.91 5001.20
5001.60 0.018579 6.86 11.85 37.13 1.90
Howes to Whit. 2477 100-YR 181.00 5000.10 5001.27 5001.50
5001.99 0.023719 7.22 31.18 99.09 2.12
Howes to Whit. 2591 2-YR 44.00 5001.90 5002.71 5002.79
5002.95 0.009592 3.89 11.31 39.87 1.28
Howes to Whit. 2591 10-YR 97.00 5001.90 5002.91 5002.99
5003.23 0.009434 4.53 22.08 65.92 1.33
Howes to Whit. 2591 100-YR 256.00 5001.90 5003.20 5003.38
5003.86 0.009079 6.56 42.75 80.13 1.43
Howes to Whit. 2723 2-YR 44.00 5003.20 5003.93 5003.97
5004.11 0.007988 3.42 12.86 47.61 1.16
Howes to Whit. 2723 10-YR 97.00 5003.20 5004.10 5004.16
5004.39 0.008016 4.29 23.63 71.91 1.23
Howes to Whit. 2723 100-YR 256.00 5003.20 5004.40 5004.54
5004.99 0.008001 6.27 45.41 79.20 1.35
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 22 of 28
Crit W.S. (ft) 4983.81 Flow Area (sq ft) 228.58
E.G. Slope (ft/ft) 0.000807 Area (sq ft) 384.12
Q Total (cfs) 502.00 Flow (cfs) 502.00
Top Width (ft) 614.57 Top Width (ft) 614.57
Vel Total (ft/s) 2.20 Avg. Vel. (ft/s) 2.20
Max Chl Dpth (ft) 1.20 Hydr. Depth (ft) 0.76
Conv. Total (cfs) 17668.9 Conv. (cfs) 17668.9
Length Wtd. (ft) 121.00 Wetted Per. (ft) 301.01
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.04
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.16 Cum Volume (acre-ft) 0.09 0.79 0.07
C & E Loss (ft) 0.03 Cum SA (acres) 0.12 1.12 0.20
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 896
INPUT
Description: Cross section 8+96
Station Elevation Data num= 14
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4985 .01 4983.05 29.81 4982.45 29.82 4981.95 31.72 4982.04
59.82 4982.93 87.82 4982.37 89.82 4982.2 89.82 4982.7 100.82 4982.81
100.82 4983.31 101.82 4983.31 200.82 4984 243.82 4985
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 29.81 .016 89.82 .025
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
29.81 89.82 130 130 130 .1 .3
Blocked Obstructions num= 1
Sta L Sta R Elev
0 0 4990
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4983.01 Element Left OB Channel Right OB
Vel Head (ft) 0.14 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4982.86 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4982.86 Flow Area (sq ft) 4.22 19.54 1.18
E.G. Slope (ft/ft) 0.004687 Area (sq ft) 4.22 19.54 1.18
Q Total (cfs) 69.00 Flow (cfs) 5.99 61.93 1.08
Top Width (ft) 85.96 Top Width (ft) 20.48 54.47 11.00
Vel Total (ft/s) 2.77 Avg. Vel. (ft/s) 1.42 3.17 0.92
Max Chl Dpth (ft) 0.91 Hydr. Depth (ft) 0.21 0.36 0.11
Conv. Total (cfs) 1007.9 Conv. (cfs) 87.5 904.6 15.8
Length Wtd. (ft) 130.00 Wetted Per. (ft) 20.49 55.49 11.05
Min Ch El (ft) 4981.95 Shear (lb/sq ft) 0.06 0.10 0.03
Alpha 1.20 Stream Power (lb/ft s) 243.82 0.00 0.00
Frctn Loss (ft) 0.62 Cum Volume (acre-ft) 0.01 0.05 0.00
C & E Loss (ft) 0.00 Cum SA (acres) 0.04 0.14 0.02
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 23 of 28
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4983.36 Element Left OB Channel Right OB
Vel Head (ft) 0.25 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4983.10 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4983.10 Flow Area (sq ft) 10.51 33.76 3.82
E.G. Slope (ft/ft) 0.004766 Area (sq ft) 10.51 33.76 3.82
Q Total (cfs) 175.00 Flow (cfs) 21.49 145.90 7.62
Top Width (ft) 100.81 Top Width (ft) 29.80 60.01 11.00
Vel Total (ft/s) 3.64 Avg. Vel. (ft/s) 2.05 4.32 1.99
Max Chl Dpth (ft) 1.15 Hydr. Depth (ft) 0.35 0.56 0.35
Conv. Total (cfs) 2534.8 Conv. (cfs) 311.2 2113.3 110.3
Length Wtd. (ft) 130.00 Wetted Per. (ft) 29.86 61.03 11.29
Min Ch El (ft) 4981.95 Shear (lb/sq ft) 0.10 0.16 0.10
Alpha 1.23 Stream Power (lb/ft s) 243.82 0.00 0.00
Frctn Loss (ft) 0.61 Cum Volume (acre-ft) 0.02 0.08 0.01
C & E Loss (ft) 0.00 Cum SA (acres) 0.06 0.18 0.03
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4984.08 Element Left OB Channel Right OB
Vel Head (ft) 0.42 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4983.67 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4983.67 Flow Area (sq ft) 27.33 67.64 19.53
E.G. Slope (ft/ft) 0.003279 Area (sq ft) 27.33 67.64 19.53
Q Total (cfs) 502.00 Flow (cfs) 86.58 385.20 30.21
Top Width (ft) 153.03 Top Width (ft) 29.80 60.01 63.22
Vel Total (ft/s) 4.38 Avg. Vel. (ft/s) 3.17 5.70 1.55
Max Chl Dpth (ft) 1.72 Hydr. Depth (ft) 0.92 1.13 0.31
Conv. Total (cfs) 8766.8 Conv. (cfs) 1512.1 6727.1 527.6
Length Wtd. (ft) 130.00 Wetted Per. (ft) 30.42 61.03 63.72
Min Ch El (ft) 4981.95 Shear (lb/sq ft) 0.18 0.23 0.06
Alpha 1.39 Stream Power (lb/ft s) 243.82 0.00 0.00
Frctn Loss (ft) 0.46 Cum Volume (acre-ft) 0.06 0.17 0.04
C & E Loss (ft) 0.01 Cum SA (acres) 0.08 0.18 0.11
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 24 of 28
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 766
INPUT
Description: Cross Section 7+66
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4985 .01 4981.29 21.51 4980.43 21.52 4979.93 23.42 4980.15
51.52 4980.97 79.22 4980.41 81.22 4980.24 81.22 4980.74 92.22 4980.82
92.22 4981.49 118.22 4983
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 21.51 .016 81.22 .025
Bank Sta: Left Right Coeff Contr. Expan.
21.51 81.22 .1 .3
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4981.24 Element Left OB Channel Right OB
Vel Head (ft) 0.49 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4980.76 Reach Len. (ft)
Crit W.S. (ft) 4980.92 Flow Area (sq ft) 1.33 11.47 0.02
E.G. Slope (ft/ft) 0.021878 Area (sq ft) 1.33 11.47 0.02
Q Total (cfs) 69.00 Flow (cfs) 3.47 65.52 0.01
Top Width (ft) 52.07 Top Width (ft) 8.14 41.77 2.16
Vel Total (ft/s) 5.38 Avg. Vel. (ft/s) 2.62 5.71 0.35
Max Chl Dpth (ft) 0.83 Hydr. Depth (ft) 0.16 0.27 0.01
Conv. Total (cfs) 466.5 Conv. (cfs) 23.5 443.0 0.0
Length Wtd. (ft) Wetted Per. (ft) 8.15 42.79 2.16
Min Ch El (ft) 4979.93 Shear (lb/sq ft) 0.22 0.37 0.01
Alpha 1.08 Stream Power (lb/ft s) 118.22 0.00 0.00
Frctn Loss (ft) 1.73 Cum Volume (acre-ft)
C & E Loss (ft) 0.03 Cum SA (acres)
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4981.65 Element Left OB Channel Right OB
Vel Head (ft) 0.68 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4980.97 Reach Len. (ft)
Crit W.S. (ft) 4981.18 Flow Area (sq ft) 3.69 22.55 2.13
E.G. Slope (ft/ft) 0.020714 Area (sq ft) 3.69 22.55 2.13
Q Total (cfs) 175.00 Flow (cfs) 13.24 155.72 6.04
Top Width (ft) 84.30 Top Width (ft) 13.59 59.71 11.00
Vel Total (ft/s) 6.17 Avg. Vel. (ft/s) 3.59 6.90 2.84
Max Chl Dpth (ft) 1.04 Hydr. Depth (ft) 0.27 0.38 0.19
Conv. Total (cfs) 1215.9 Conv. (cfs) 92.0 1081.9 42.0
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 18 of 28
Vel Total (ft/s) 5.03 Avg. Vel. (ft/s) 0.88 5.35
Max Chl Dpth (ft) 1.12 Hydr. Depth (ft) 0.19 0.39
Conv. Total (cfs) 803.8 Conv. (cfs) 10.0 793.7
Length Wtd. (ft) 117.00 Wetted Per. (ft) 6.71 42.53
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.14 0.29
Alpha 1.12 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.52 Cum Volume (acre-ft) 0.02 0.25 0.00
C & E Loss (ft) 0.02 Cum SA (acres) 0.08 0.89 0.03
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4985.25 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4984.62 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4984.80 Flow Area (sq ft) 3.45 28.55
E.G. Slope (ft/ft) 0.012175 Area (sq ft) 3.45 28.55
Q Total (cfs) 188.00 Flow (cfs) 4.31 183.69
Top Width (ft) 67.14 Top Width (ft) 11.14 56.00
Vel Total (ft/s) 5.87 Avg. Vel. (ft/s) 1.25 6.43
Max Chl Dpth (ft) 1.37 Hydr. Depth (ft) 0.31 0.51
Conv. Total (cfs) 1703.8 Conv. (cfs) 39.1 1664.8
Length Wtd. (ft) 117.00 Wetted Per. (ft) 11.16 57.41
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.23 0.38
Alpha 1.17 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.44 Cum Volume (acre-ft) 0.04 0.51 0.02
C & E Loss (ft) 0.03 Cum SA (acres) 0.13 1.23 0.06
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4986.23 Element Left OB Channel Right OB
Vel Head (ft) 1.16 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4985.07 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4985.44 Flow Area (sq ft) 10.35 53.88 1.67
E.G. Slope (ft/ft) 0.009811 Area (sq ft) 10.35 53.88 1.67
Q Total (cfs) 492.00 Flow (cfs) 16.43 474.33 1.24
Top Width (ft) 94.07 Top Width (ft) 19.85 56.00 18.21
Vel Total (ft/s) 7.47 Avg. Vel. (ft/s) 1.59 8.80 0.75
Max Chl Dpth (ft) 1.82 Hydr. Depth (ft) 0.52 0.96 0.09
Conv. Total (cfs) 4967.1 Conv. (cfs) 165.8 4788.7 12.6
Length Wtd. (ft) 117.00 Wetted Per. (ft) 19.88 57.54 18.24
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.32 0.57 0.06
Alpha 1.34 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.18 Cum Volume (acre-ft) 0.12 1.41 0.08
C & E Loss (ft) 0.06 Cum SA (acres) 0.18 1.93 0.26
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 19 of 28
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1101
INPUT
Description: Cross Section 11+01
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 20 4985 40 4984 40 4983.25 70 4983.83
103 4983.25 103 4984 125 4985 163 4986 188 4987
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 40 .016 103 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
40 103 84 84 84 .1 .3
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4995 148 188 4995
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4984.13 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.94 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4983.94 Flow Area (sq ft) 25.16
E.G. Slope (ft/ft) 0.004963 Area (sq ft) 25.16
Q Total (cfs) 88.00 Flow (cfs) 88.00
Top Width (ft) 63.00 Top Width (ft) 63.00
Vel Total (ft/s) 3.50 Avg. Vel. (ft/s) 3.50
Max Chl Dpth (ft) 0.69 Hydr. Depth (ft) 0.40
Conv. Total (cfs) 1249.1 Conv. (cfs) 1249.1
Length Wtd. (ft) 84.00 Wetted Per. (ft) 64.39
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.12
Alpha 1.00 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.31 Cum Volume (acre-ft) 0.01 0.20 0.00
C & E Loss (ft) 0.04 Cum SA (acres) 0.07 0.75 0.03
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #10-YR
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 20 of 28
E.G. Elev (ft) 4984.52 Element Left OB Channel Right OB
Vel Head (ft) 0.32 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4984.19 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4984.19 Flow Area (sq ft) 0.38 41.22 0.42
E.G. Slope (ft/ft) 0.004366 Area (sq ft) 0.38 41.22 0.42
Q Total (cfs) 188.00 Flow (cfs) 0.13 187.65 0.22
Top Width (ft) 71.16 Top Width (ft) 3.89 63.00 4.28
Vel Total (ft/s) 4.47 Avg. Vel. (ft/s) 0.35 4.55 0.52
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.10 0.65 0.10
Conv. Total (cfs) 2845.2 Conv. (cfs) 2.0 2840.0 3.3
Length Wtd. (ft) 84.00 Wetted Per. (ft) 3.89 64.51 4.28
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.03 0.17 0.03
Alpha 1.03 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.25 Cum Volume (acre-ft) 0.04 0.42 0.01
C & E Loss (ft) 0.07 Cum SA (acres) 0.11 1.07 0.05
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4985.36 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4984.73 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4984.80 Flow Area (sq ft) 5.31 74.87 5.84
E.G. Slope (ft/ft) 0.003921 Area (sq ft) 5.31 74.87 5.84
Q Total (cfs) 492.00 Flow (cfs) 4.19 480.88 6.92
Top Width (ft) 93.60 Top Width (ft) 14.57 63.00 16.03
Vel Total (ft/s) 5.72 Avg. Vel. (ft/s) 0.79 6.42 1.19
Max Chl Dpth (ft) 1.48 Hydr. Depth (ft) 0.36 1.19 0.36
Conv. Total (cfs) 7857.1 Conv. (cfs) 67.0 7679.6 110.5
Length Wtd. (ft) 84.00 Wetted Per. (ft) 14.59 64.51 16.04
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.09 0.28 0.09
Alpha 1.23 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 0.10 1.24 0.07
C & E Loss (ft) 0.16 Cum SA (acres) 0.13 1.77 0.21
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1017
INPUT
Description: Cross Section 10+17
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4984.4 125.2 4984 437.8 4983 467.7 4983 485.2 4983.16
505.2 4983.13 525.2 4983.25 535.2 4983.45 644.1 4984 814.8 4985
lowest, valid, energy was used.
CROSS SECTION
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 14 of 28
RIVER: Laporte
REACH: Howes to Whit. RS: 1599
INPUT
Description: West of Meldrum and Laporte intersection
Station Elevation Data num= 13
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988 337.6 4987.3 382 4987.3 382.1 4986.5 417.5 4987
439.7 4986.6 439.8 4987.4 469.3 4987.7 484.2 4988 505.4 4988
528.6 4987.3 562.7 4987.3 571.1 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 382 .016 439.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
382 439.8 201 201 201 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 365.3 4997 F
456.8 571.1 4997 F
Blocked Obstructions num= 5
Sta L Sta R Elev Sta L Sta R Elev Sta L Sta R Elev
142.5 192.7 4998 204.6 233.9 4998 284.7 337.6 4998
469.3 510.1 4998 528.6 562.7 4998
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4986.71 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.016
W.S. Elev (ft) 4986.70 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4986.64 Flow Area (sq ft) 1.72
E.G. Slope (ft/ft) 0.001045 Area (sq ft) 1.72
Q Total (cfs) 1.00 Flow (cfs) 1.00
Top Width (ft) 19.89 Top Width (ft) 19.89
Vel Total (ft/s) 0.58 Avg. Vel. (ft/s) 0.58
Max Chl Dpth (ft) 0.20 Hydr. Depth (ft) 0.09
Conv. Total (cfs) 30.9 Conv. (cfs) 30.9
Length Wtd. (ft) 201.00 Wetted Per. (ft) 20.16
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.01
Alpha 1.00 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.35 Cum Volume (acre-ft) 0.02 0.40 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.10 1.29 0.09
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4987.14 Element Left OB Channel Right OB
Vel Head (ft) 0.04 Wt. n-Val. 0.016
W.S. Elev (ft) 4987.10 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4986.98 Flow Area (sq ft) 19.06
E.G. Slope (ft/ft) 0.001374 Area (sq ft) 19.06
Q Total (cfs) 31.00 Flow (cfs) 31.00
Top Width (ft) 57.74 Top Width (ft) 57.74
Vel Total (ft/s) 1.63 Avg. Vel. (ft/s) 1.63
Max Chl Dpth (ft) 0.60 Hydr. Depth (ft) 0.33
Conv. Total (cfs) 836.4 Conv. (cfs) 836.4
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 15 of 28
Length Wtd. (ft) 201.00 Wetted Per. (ft) 58.71
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.03
Alpha 1.00 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.41 Cum Volume (acre-ft) 0.05 0.80 0.05
C & E Loss (ft) 0.02 Cum SA (acres) 0.18 1.74 0.22
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4987.78 Element Left OB Channel Right OB
Vel Head (ft) 0.09 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4987.70 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4987.32 Flow Area (sq ft) 6.60 53.49 3.55
E.G. Slope (ft/ft) 0.000780 Area (sq ft) 30.67 53.49 7.82
Q Total (cfs) 133.00 Flow (cfs) 2.46 129.67 0.87
Top Width (ft) 211.78 Top Width (ft) 107.10 57.80 46.88
Vel Total (ft/s) 2.09 Avg. Vel. (ft/s) 0.37 2.42 0.24
Max Chl Dpth (ft) 1.20 Hydr. Depth (ft) 0.40 0.93 0.21
Conv. Total (cfs) 4760.6 Conv. (cfs) 88.1 4641.5 31.0
Length Wtd. (ft) 201.00 Wetted Per. (ft) 16.70 59.22 17.00
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.02 0.04 0.01
Alpha 1.31 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.25 Cum Volume (acre-ft) 0.24 1.97 0.28
C & E Loss (ft) 0.04 Cum SA (acres) 0.53 2.44 0.77
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1398
INPUT
Description: Cross Section 13+98
Station Elevation Data num= 19
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988 10 4988 12 4987 17 4986 63 4986
74 4986.13 74 4987.45 75 4987.45 75 4987 90 4986
90 4985.25 112 4986 120 4986.05 130 4986 150 4985.25
150 4986 170 4986.24 235 4987 335 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 90 .016 150 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
90 150 180 180 180 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
170 335 4995 F
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 16 of 28
Left Levee Station= 75 Elevation= 4987.45
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4986.35 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.16 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.16 Flow Area (sq ft) 0.18 24.68 1.02
E.G. Slope (ft/ft) 0.004915 Area (sq ft) 0.18 24.68 1.02
Q Total (cfs) 88.00 Flow (cfs) 0.14 87.38 0.48
Top Width (ft) 75.35 Top Width (ft) 2.34 60.00 13.01
Vel Total (ft/s) 3.40 Avg. Vel. (ft/s) 0.76 3.54 0.48
Max Chl Dpth (ft) 0.91 Hydr. Depth (ft) 0.08 0.41 0.08
Conv. Total (cfs) 1255.2 Conv. (cfs) 2.0 1246.4 6.9
Length Wtd. (ft) 180.00 Wetted Per. (ft) 2.35 61.53 13.01
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.02 0.12 0.02
Alpha 1.08 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.88 Cum Volume (acre-ft) 0.02 0.34 0.01
C & E Loss (ft) 0.00 Cum SA (acres) 0.10 1.10 0.06
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4986.71 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.43 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.43 Flow Area (sq ft) 1.39 41.14 6.21
E.G. Slope (ft/ft) 0.003782 Area (sq ft) 1.39 41.14 7.76
Q Total (cfs) 188.00 Flow (cfs) 1.82 179.67 6.51
Top Width (ft) 102.75 Top Width (ft) 6.46 60.00 36.29
Vel Total (ft/s) 3.86 Avg. Vel. (ft/s) 1.31 4.37 1.05
Max Chl Dpth (ft) 1.18 Hydr. Depth (ft) 0.22 0.69 0.31
Conv. Total (cfs) 3057.1 Conv. (cfs) 29.7 2921.7 105.8
Length Wtd. (ft) 180.00 Wetted Per. (ft) 6.47 61.53 20.00
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.05 0.16 0.07
Alpha 1.23 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 0.05 0.66 0.03
C & E Loss (ft) 0.01 Cum SA (acres) 0.17 1.47 0.13
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
lowest, valid, energy was used.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 10 of 28
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4993.36 Element Left OB Channel Right OB
Vel Head (ft) 0.64 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4992.72 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.92 Flow Area (sq ft) 6.84 25.78 1.17
E.G. Slope (ft/ft) 0.013539 Area (sq ft) 7.57 25.78 1.17
Q Total (cfs) 181.00 Flow (cfs) 9.63 170.59 0.78
Top Width (ft) 92.12 Top Width (ft) 29.01 52.55 10.55
Vel Total (ft/s) 5.36 Avg. Vel. (ft/s) 1.41 6.62 0.66
Max Chl Dpth (ft) 1.22 Hydr. Depth (ft) 0.34 0.49 0.11
Conv. Total (cfs) 1555.5 Conv. (cfs) 82.8 1466.1 6.7
Length Wtd. (ft) 118.00 Wetted Per. (ft) 20.00 53.81 10.55
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.29 0.40 0.09
Alpha 1.44 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 4.00 Cum Volume (acre-ft) 0.33 2.30 0.30
C & E Loss (ft) 0.12 Cum SA (acres) 0.93 3.06 0.90
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1975
INPUT
Description: East of Sherwood and Laporte intersection
Station Elevation Data num= 7
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4991.1 11.9 4991 17.5 4990.1 43.1 4990.9 73.6 4990.1
80.5 4991 107.9 4991.6
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 17.5 .016 73.6 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
17.5 73.6 184 184 184 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5001 F
91.2 107.9 5001 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4990.31 Element Left OB Channel Right OB
Vel Head (ft) 0.11 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.20 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4990.23 Flow Area (sq ft) 0.03 0.34 0.04
E.G. Slope (ft/ft) 0.048454 Area (sq ft) 0.03 0.34 0.04
Q Total (cfs) 1.00 Flow (cfs) 0.02 0.95 0.03
Top Width (ft) 8.33 Top Width (ft) 0.62 6.95 0.76
Vel Total (ft/s) 2.42 Avg. Vel. (ft/s) 0.73 2.76 0.73
Max Chl Dpth (ft) 0.10 Hydr. Depth (ft) 0.05 0.05 0.05
Conv. Total (cfs) 4.5 Conv. (cfs) 0.1 4.3 0.1
Length Wtd. (ft) 184.00 Wetted Per. (ft) 0.62 6.96 0.77
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.15 0.15 0.15
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 2.08 Cum Volume (acre-ft) 0.02 0.40 0.01
C & E Loss (ft) 0.05 Cum SA (acres) 0.11 1.38 0.09
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 11 of 28
Warning: The energy equation could not be balanced within the specified number of iterations.
The program selected the water
surface that had the least amount of error between computed and assumed values.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4990.86 Element Left OB Channel Right OB
Vel Head (ft) 0.34 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.52 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4990.61 Flow Area (sq ft) 0.54 6.13 0.67
E.G. Slope (ft/ft) 0.021619 Area (sq ft) 0.54 6.13 0.67
Q Total (cfs) 31.00 Flow (cfs) 0.69 29.45 0.85
Top Width (ft) 35.12 Top Width (ft) 2.60 29.32 3.20
Vel Total (ft/s) 4.22 Avg. Vel. (ft/s) 1.27 4.81 1.28
Max Chl Dpth (ft) 0.42 Hydr. Depth (ft) 0.21 0.21 0.21
Conv. Total (cfs) 210.8 Conv. (cfs) 4.7 200.3 5.8
Length Wtd. (ft) 184.00 Wetted Per. (ft) 2.63 29.33 3.23
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.28 0.28 0.28
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 1.91 Cum Volume (acre-ft) 0.06 0.90 0.05
C & E Loss (ft) 0.00 Cum SA (acres) 0.19 2.11 0.22
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4991.47 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.84 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4991.01 Flow Area (sq ft) 1.72 19.37 2.12
E.G. Slope (ft/ft) 0.018484 Area (sq ft) 1.72 19.37 2.12
Q Total (cfs) 133.00 Flow (cfs) 2.97 126.37 3.66
Top Width (ft) 62.45 Top Width (ft) 4.62 52.13 5.70
Vel Total (ft/s) 5.73 Avg. Vel. (ft/s) 1.73 6.52 1.73
Max Chl Dpth (ft) 0.74 Hydr. Depth (ft) 0.37 0.37 0.37
Conv. Total (cfs) 978.3 Conv. (cfs) 21.8 929.5 27.0
Length Wtd. (ft) 184.00 Wetted Per. (ft) 4.68 52.15 5.75
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.42 0.43 0.43
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 1.89 Cum Volume (acre-ft) 0.32 2.24 0.30
C & E Loss (ft) 0.00 Cum SA (acres) 0.89 2.92 0.88
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 12 of 28
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1791
INPUT
Description: Laporte between Meldrum and Sherwood
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988.8 34.9 4988.6 35 4987.8 38 4988 66.1 4988.6
91.7 4988 91.8 4988.8 94.5 4989 113.1 4989.2
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 34.9 .016 91.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
34.9 91.8 192 192 192 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 19 4999 F
110 113.1 4999 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4988.10 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.016
W.S. Elev (ft) 4988.05 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.05 Flow Area (sq ft) 0.57
E.G. Slope (ft/ft) 0.011648 Area (sq ft) 0.57
Q Total (cfs) 1.00 Flow (cfs) 1.00
Top Width (ft) 7.58 Top Width (ft) 7.58
Vel Total (ft/s) 1.75 Avg. Vel. (ft/s) 1.75
Max Chl Dpth (ft) 0.25 Hydr. Depth (ft) 0.08
Conv. Total (cfs) 9.3 Conv. (cfs) 9.3
Length Wtd. (ft) 192.00 Wetted Per. (ft) 7.86
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.05
Alpha 1.00 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 1.22 Cum Volume (acre-ft) 0.02 0.40 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.10 1.35 0.09
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
NORTHERN ENGINEERING; APRIL 15, 2015
Page 6 of 28
E.G. Elev (ft) 5001.10 Element Left OB Channel Right OB
Vel Head (ft) 0.48 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5000.62 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5000.78 Flow Area (sq ft) 3.56 0.28
E.G. Slope (ft/ft) 0.022342 Area (sq ft) 3.56 0.28
Q Total (cfs) 20.00 Flow (cfs) 19.84 0.16
Top Width (ft) 18.33 Top Width (ft) 13.71 4.62
Vel Total (ft/s) 5.21 Avg. Vel. (ft/s) 5.57 0.56
Max Chl Dpth (ft) 0.52 Hydr. Depth (ft) 0.26 0.06
Conv. Total (cfs) 133.8 Conv. (cfs) 132.8 1.0
Length Wtd. (ft) 176.00 Wetted Per. (ft) 14.03 4.62
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.35 0.08
Alpha 1.13 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.82 Cum Volume (acre-ft) 0.02 0.45 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.11 1.56 0.10
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5001.60 Element Left OB Channel Right OB
Vel Head (ft) 0.69 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5000.91 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5001.20 Flow Area (sq ft) 8.62 3.23
E.G. Slope (ft/ft) 0.018579 Area (sq ft) 8.62 3.23
Q Total (cfs) 63.00 Flow (cfs) 59.15 3.85
Top Width (ft) 37.13 Top Width (ft) 21.29 15.84
Vel Total (ft/s) 5.31 Avg. Vel. (ft/s) 6.86 1.19
Max Chl Dpth (ft) 0.81 Hydr. Depth (ft) 0.41 0.21
Conv. Total (cfs) 462.2 Conv. (cfs) 434.0 28.2
Length Wtd. (ft) 176.00 Wetted Per. (ft) 21.62 15.41
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.46 0.24
Alpha 1.57 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.60 Cum Volume (acre-ft) 0.06 1.01 0.06
C & E Loss (ft) 0.04 Cum SA (acres) 0.24 2.47 0.26
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5001.99 Element Left OB Channel Right OB
Vel Head (ft) 0.72 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 5001.27 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5001.50 Flow Area (sq ft) 0.58 21.80 8.80
E.G. Slope (ft/ft) 0.023719 Area (sq ft) 0.58 21.80 11.77
Q Total (cfs) 181.00 Flow (cfs) 0.43 157.46 23.11
Top Width (ft) 99.09 Top Width (ft) 6.80 60.40 31.89
Vel Total (ft/s) 5.81 Avg. Vel. (ft/s) 0.74 7.22 2.63
Max Chl Dpth (ft) 1.17 Hydr. Depth (ft) 0.08 0.36 0.57
Conv. Total (cfs) 1175.2 Conv. (cfs) 2.8 1022.4 150.1
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 7 of 28
Length Wtd. (ft) 176.00 Wetted Per. (ft) 6.80 60.73 15.41
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.13 0.53 0.85
Alpha 1.37 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.87 Cum Volume (acre-ft) 0.35 2.50 0.34
C & E Loss (ft) 0.01 Cum SA (acres) 1.01 3.55 1.05
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2301
INPUT
Description: Laporte between Sherwood and Whitcomb
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4997 25.4 4997 48.7 4996.6 48.8 4995.9 54.4 4996
78.1 4996.5 90.9 4996 107.5 4995.4 107.6 4996.1 142.8 4997
144.6 4997
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 48.7 .016 107.6 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
48.7 107.6 208 208 208 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 32.1 5007 F
123.7 144.6 5007 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4996.47 Element Left OB Channel Right OB
Vel Head (ft) 0.58 Wt. n-Val. 0.016
W.S. Elev (ft) 4995.88 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.07 Flow Area (sq ft) 3.26
E.G. Slope (ft/ft) 0.030108 Area (sq ft) 3.26
Q Total (cfs) 20.00 Flow (cfs) 20.00
Top Width (ft) 13.47 Top Width (ft) 13.47
Vel Total (ft/s) 6.13 Avg. Vel. (ft/s) 6.13
Max Chl Dpth (ft) 0.48 Hydr. Depth (ft) 0.24
Conv. Total (cfs) 115.3 Conv. (cfs) 115.3
Length Wtd. (ft) 208.00 Wetted Per. (ft) 13.90
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.44
Alpha 1.00 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.62 Cum Volume (acre-ft) 0.02 0.43 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.11 1.50 0.09
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 8 of 28
E.G. Elev (ft) 4996.93 Element Left OB Channel Right OB
Vel Head (ft) 0.80 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 4996.13 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.36 Flow Area (sq ft) 8.77 0.02
E.G. Slope (ft/ft) 0.034385 Area (sq ft) 8.77 0.02
Q Total (cfs) 63.00 Flow (cfs) 63.00 0.00
Top Width (ft) 32.87 Top Width (ft) 31.74 1.13
Vel Total (ft/s) 7.17 Avg. Vel. (ft/s) 7.18 0.27
Max Chl Dpth (ft) 0.73 Hydr. Depth (ft) 0.28 0.01
Conv. Total (cfs) 339.7 Conv. (cfs) 339.7 0.0
Length Wtd. (ft) 208.00 Wetted Per. (ft) 32.56 1.13
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.58 0.03
Alpha 1.00 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.66 Cum Volume (acre-ft) 0.06 0.98 0.05
C & E Loss (ft) 0.01 Cum SA (acres) 0.24 2.36 0.23
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4997.47 Element Left OB Channel Right OB
Vel Head (ft) 1.04 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 4996.43 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.73 Flow Area (sq ft) 21.63 2.12
E.G. Slope (ft/ft) 0.027272 Area (sq ft) 21.63 2.12
Q Total (cfs) 181.00 Flow (cfs) 178.39 2.61
Top Width (ft) 66.63 Top Width (ft) 53.74 12.89
Vel Total (ft/s) 7.62 Avg. Vel. (ft/s) 8.25 1.23
Max Chl Dpth (ft) 1.03 Hydr. Depth (ft) 0.40 0.16
Conv. Total (cfs) 1096.0 Conv. (cfs) 1080.2 15.8
Length Wtd. (ft) 208.00 Wetted Per. (ft) 54.83 12.90
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.67 0.28
Alpha 1.16 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.49 Cum Volume (acre-ft) 0.35 2.41 0.31
C & E Loss (ft) 0.03 Cum SA (acres) 1.00 3.32 0.96
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2093
INPUT
Description: West of Sherwood and Laporte intersection
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4993.2 7 4993 51.5 4992.2 51.6 4991.5 59.1 4992
79 4992.8 103.6 4992 108.3 4991.8 108.4 4992.5 132.2 4993
144.2 4993.4
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
FLOW DATA
Flow Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Flow File : C:\temp\940-002\PC\Laporte_PC.f02
Flow Data (cfs)
River Reach RS 2-YR 10-YR 100-YR
Laporte Howes to Whit. 2723 44 97 256
Laporte Howes to Whit. 2477 20 63 181
Laporte Howes to Whit. 1975 1 31 133
Laporte Howes to Whit. 1398 88 188 492
Laporte Howes to Whit. 1017 69 175 502
Boundary Conditions
River Reach Profile Upstream
Downstream
Laporte Howes to Whit. 2-YR Normal S = 0.008 Normal S
= 0.01
Laporte Howes to Whit. 10-YR Normal S = 0.008 Normal S
= 0.01
Laporte Howes to Whit. 100-YR Normal S = 0.008 Known WS =
4980.06
GEOMETRY DATA
Geometry Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : C:\temp\940-002\PC\Laporte_PC.g02
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2723
INPUT
Description: Laporte between Whitcomb and Loomis
The floodplain at this
cross-section was plotted based on an interpolated gutter flowline
elevation and a field measured curb height. See project
description for further details.
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5005.1 10.7 5005 54.9 5004.4 55 5003.6 82.2 5004
85 5004.1 86.5 5004 114.2 5003.2 114.3 5004 124.3 5004
144.1 5004.8
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 54.9 .016 114.3 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
54.9 114.3 132 132 132 .1 .3
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Page 3 of 28
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 38.2 5015 F
129.9 144.1 5015 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 5004.11 Element Left OB Channel Right OB
Vel Head (ft) 0.18 Wt. n-Val. 0.016
W.S. Elev (ft) 5003.93 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5003.97 Flow Area (sq ft) 12.86
E.G. Slope (ft/ft) 0.007988 Area (sq ft) 12.86
Q Total (cfs) 44.00 Flow (cfs) 44.00
Top Width (ft) 47.61 Top Width (ft) 47.61
Vel Total (ft/s) 3.42 Avg. Vel. (ft/s) 3.42
Max Chl Dpth (ft) 0.73 Hydr. Depth (ft) 0.27
Conv. Total (cfs) 492.3 Conv. (cfs) 492.3
Length Wtd. (ft) 132.00 Wetted Per. (ft) 48.56
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.13
Alpha 1.00 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.02 0.50 0.01
C & E Loss (ft) Cum SA (acres) 0.11 1.76 0.11
Warning: Divided flow computed for this cross-section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5004.39 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5004.10 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5004.16 Flow Area (sq ft) 22.47 1.16
E.G. Slope (ft/ft) 0.008016 Area (sq ft) 22.47 1.16
Q Total (cfs) 97.00 Flow (cfs) 96.47 0.53
Top Width (ft) 71.91 Top Width (ft) 59.36 12.55
Vel Total (ft/s) 4.11 Avg. Vel. (ft/s) 4.29 0.45
Max Chl Dpth (ft) 0.90 Hydr. Depth (ft) 0.38 0.09
Conv. Total (cfs) 1083.4 Conv. (cfs) 1077.5 5.9
Length Wtd. (ft) 132.00 Wetted Per. (ft) 60.53 12.55
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.19 0.05
Alpha 1.09 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.06 1.12 0.07
C & E Loss (ft) Cum SA (acres) 0.24 2.76 0.32
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5004.99 Element Left OB Channel Right OB
Vel Head (ft) 0.60 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5004.40 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5004.54 Flow Area (sq ft) 39.86 5.54
E.G. Slope (ft/ft) 0.008001 Area (sq ft) 39.86 5.90
Q Total (cfs) 256.00 Flow (cfs) 249.84 6.16
Top Width (ft) 79.20 Top Width (ft) 59.40 19.80
Vel Total (ft/s) 5.64 Avg. Vel. (ft/s) 6.27 1.11
Max Chl Dpth (ft) 1.20 Hydr. Depth (ft) 0.67 0.36
Conv. Total (cfs) 2862.0 Conv. (cfs) 2793.1 68.9
Length Wtd. (ft) 132.00 Wetted Per. (ft) 60.83 15.60
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.33 0.18
Alpha 1.21 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.35 2.70 0.38
C & E Loss (ft) Cum SA (acres) 1.02 3.88 1.18
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; PROPOSED CONDITION MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 4 of 28
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2591
INPUT
Description: West of Whitcomb and Laporte intersection
The floodplain at this
cross-section was plotted based on an interpolated gutter flowline
elevation and a field measured curb height. See project
description for further details.
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5003.3 48 5003.3 48.1 5002.5 77.1 5002.9 104 5002
106.7 5001.9 106.8 5002.7 116.9 5003 133.5 5003.3
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 48 .016 106.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
48 106.8 114 114 114 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 30.4 5013 F
122.2 133.5 5013 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 5002.95 Element Left OB Channel Right OB
Vel Head (ft) 0.24 Wt. n-Val. 0.016 0.000
W.S. Elev (ft) 5002.71 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5002.79 Flow Area (sq ft) 11.30 0.00
E.G. Slope (ft/ft) 0.009592 Area (sq ft) 11.30 0.00
Q Total (cfs) 44.00 Flow (cfs) 44.00 0.00
Top Width (ft) 39.87 Top Width (ft) 39.47 0.39
Vel Total (ft/s) 3.89 Avg. Vel. (ft/s) 3.89 0.08
Max Chl Dpth (ft) 0.81 Hydr. Depth (ft) 0.29 0.01
Conv. Total (cfs) 449.3 Conv. (cfs) 449.3 0.0
Length Wtd. (ft) 114.00 Wetted Per. (ft) 40.38 0.39
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.17
Alpha 1.00 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.16 Cum Volume (acre-ft) 0.02 0.46 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.11 1.63 0.11
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5003.23 Element Left OB Channel Right OB
Vel Head (ft) 0.32 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5002.91 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5002.99 Flow Area (sq ft) 21.31 0.76
E.G. Slope (ft/ft) 0.009434 Area (sq ft) 21.31 0.76
Q Total (cfs) 97.00 Flow (cfs) 96.59 0.41
4983.40 0.002704 1.86 37.04 198.65 0.67
Howes to Whit. 1017 10-YR 175.00 4983.00 4983.59 4983.45
4983.67 0.001889 2.25 77.80 307.70 0.61
Howes to Whit. 1017 100-YR 502.00 4983.00 4984.21 4983.81
4984.29 0.000754 2.15 233.28 622.13 0.43
Howes to Whit. 1101 2-YR 88.00 4983.25 4983.94 4983.94
4984.13 0.004963 3.50 25.16 63.00 0.98
Howes to Whit. 1101 10-YR 188.00 4983.25 4984.19 4984.19
4984.52 0.004366 4.55 42.01 71.16 0.99
Howes to Whit. 1101 100-YR 492.00 4983.25 4984.73 4984.80
4985.36 0.003921 6.42 86.02 93.60 1.04
Howes to Whit. 1218 2-YR 88.00 4983.25 4984.37 4984.52
4984.81 0.011986 5.35 17.49 48.08 1.51
Howes to Whit. 1218 10-YR 188.00 4983.25 4984.62 4984.80
4985.25 0.012175 6.43 32.00 67.14 1.59
Howes to Whit. 1218 100-YR 492.00 4983.25 4985.07 4985.44
4986.23 0.009811 8.80 65.89 94.07 1.58
Howes to Whit. 1398 2-YR 88.00 4985.25 4986.16 4986.16
4986.35 0.004915 3.54 25.88 75.35 0.97
Howes to Whit. 1398 10-YR 188.00 4985.25 4986.43 4986.43
4986.71 0.003782 4.37 48.74 102.75 0.93
Howes to Whit. 1398 100-YR 492.00 4985.25 4986.97 4986.97
4987.49 0.003307 6.03 97.90 157.35 0.96
Howes to Whit. 1599 2-YR 1.00 4986.50 4986.70 4986.64
4986.71 0.001045 0.58 1.72 19.89 0.35
Howes to Whit. 1599 10-YR 31.00 4986.50 4987.10 4986.98
4987.14 0.001374 1.63 19.06 57.74 0.50
Howes to Whit. 1599 100-YR 133.00 4986.50 4987.70 4987.32
4987.78 0.000780 2.42 63.65 211.78 0.44
Howes to Whit. 1791 2-YR 1.00 4987.80 4988.05 4988.05
4988.10 0.011648 1.75 0.57 7.58 1.12
Howes to Whit. 1791 10-YR 31.00 4987.80 4988.45 4988.45
4988.58 0.006755 2.95 10.53 42.94 1.05
Howes to Whit. 1791 100-YR 133.00 4987.80 4988.75 4988.84
4989.13 0.008260 4.99 28.07 82.15 1.29
Howes to Whit. 1975 2-YR 1.00 4990.10 4990.20 4990.23
4990.31 0.048454 2.76 0.41 8.33 2.18
Howes to Whit. 1975 10-YR 31.00 4990.10 4990.52 4990.61
4990.86 0.021619 4.81 7.34 35.12 1.85
Howes to Whit. 1975 100-YR 133.00 4990.10 4990.84 4991.01
4991.47 0.018484 6.52 23.21 62.45 1.89
Howes to Whit. 2093 2-YR 20.00 4991.50 4992.17 4992.24
4992.40 0.012077 3.84 5.21 21.67 1.38
Howes to Whit. 2093 10-YR 63.00 4991.50 4992.44 4992.55
4992.78 0.010820 4.75 14.61 49.83 1.40
Howes to Whit. 2093 100-YR 181.00 4991.50 4992.72 4992.92
4993.36 0.013539 6.62 33.79 92.12 1.66
Howes to Whit. 2301 2-YR 20.00 4995.40 4995.88 4996.07
4996.47 0.030108 6.13 3.26 13.47 2.20
Howes to Whit. 2301 10-YR 63.00 4995.40 4996.13 4996.36
4996.93 0.034385 7.18 8.79 32.87 2.41
Howes to Whit. 2301 100-YR 181.00 4995.40 4996.43 4996.73
4997.47 0.027272 8.25 23.75 66.63 2.29
Howes to Whit. 2477 2-YR 20.00 5000.10 5000.62 5000.78
5001.10 0.022342 5.57 3.84 18.33 1.92
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 28 of 28
Howes to Whit. 2477 10-YR 63.00 5000.10 5000.91 5001.20
5001.60 0.018579 6.86 11.85 37.13 1.90
Howes to Whit. 2477 100-YR 181.00 5000.10 5001.27 5001.50
5001.99 0.023719 7.22 31.18 99.09 2.12
Howes to Whit. 2591 2-YR 44.00 5001.90 5002.71 5002.79
5002.95 0.009592 3.89 11.31 39.87 1.28
Howes to Whit. 2591 10-YR 97.00 5001.90 5002.91 5002.99
5003.23 0.009434 4.53 22.08 65.92 1.33
Howes to Whit. 2591 100-YR 256.00 5001.90 5003.20 5003.38
5003.86 0.009079 6.56 42.75 80.13 1.43
Howes to Whit. 2723 2-YR 44.00 5003.20 5003.93 5003.97
5004.11 0.007988 3.42 12.86 47.61 1.16
Howes to Whit. 2723 10-YR 97.00 5003.20 5004.10 5004.16
5004.39 0.008016 4.29 23.63 71.91 1.23
Howes to Whit. 2723 100-YR 256.00 5003.20 5004.40 5004.54
5004.99 0.008001 6.27 45.41 79.20 1.35
NORTHERN ENGINEERING; APRIL 15, 2015
Page 23 of 28
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4983.32 Element Left OB Channel Right OB
Vel Head (ft) 0.26 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4983.07 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4983.07 Flow Area (sq ft) 9.03 33.82 3.41
E.G. Slope (ft/ft) 0.004783 Area (sq ft) 9.03 33.82 3.41
Q Total (cfs) 175.00 Flow (cfs) 22.06 146.61 6.33
Top Width (ft) 90.62 Top Width (ft) 19.61 60.01 11.00
Vel Total (ft/s) 3.78 Avg. Vel. (ft/s) 2.44 4.33 1.86
Max Chl Dpth (ft) 1.31 Hydr. Depth (ft) 0.46 0.56 0.31
Conv. Total (cfs) 2530.3 Conv. (cfs) 318.9 2119.8 91.6
Length Wtd. (ft) 130.00 Wetted Per. (ft) 19.71 61.01 11.26
Min Ch El (ft) 4981.76 Shear (lb/sq ft) 0.14 0.17 0.09
Alpha 1.16 Stream Power (lb/ft s) 233.63 0.00 0.00
Frctn Loss (ft) 0.59 Cum Volume (acre-ft) 0.02 0.09 0.01
C & E Loss (ft) 0.00 Cum SA (acres) 0.04 0.18 0.03
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4984.10 Element Left OB Channel Right OB
Vel Head (ft) 0.44 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4983.66 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4983.66 Flow Area (sq ft) 20.77 69.75 19.34
E.G. Slope (ft/ft) 0.003213 Area (sq ft) 20.77 69.75 19.34
Q Total (cfs) 502.00 Flow (cfs) 71.03 401.41 29.56
Top Width (ft) 142.42 Top Width (ft) 19.61 60.01 62.80
Vel Total (ft/s) 4.57 Avg. Vel. (ft/s) 3.42 5.76 1.53
Max Chl Dpth (ft) 1.90 Hydr. Depth (ft) 1.06 1.16 0.31
Conv. Total (cfs) 8856.8 Conv. (cfs) 1253.1 7082.1 521.6
Length Wtd. (ft) 130.00 Wetted Per. (ft) 20.31 61.01 63.30
Min Ch El (ft) 4981.76 Shear (lb/sq ft) 0.21 0.23 0.06
Alpha 1.35 Stream Power (lb/ft s) 233.63 0.00 0.00
Frctn Loss (ft) 0.44 Cum Volume (acre-ft) 0.04 0.17 0.04
C & E Loss (ft) 0.01 Cum SA (acres) 0.05 0.18 0.11
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 24 of 28
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 766
INPUT
Description: Cross Section 7+66
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4985 .01 4981.81 19.29 4980.53 19.3 4980 21.2 4980.22
49.3 4980.97 77.3 4980.41 79.3 4980.24 79.3 4980.74 90.3 4980.82
90.3 4981.49 116.3 4983
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 19.29 .016 79.3 .025
Bank Sta: Left Right Coeff Contr. Expan.
19.29 79.3 .1 .3
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4981.26 Element Left OB Channel Right OB
Vel Head (ft) 0.47 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4980.80 Reach Len. (ft)
Crit W.S. (ft) 4980.96 Flow Area (sq ft) 0.54 12.24 0.23
E.G. Slope (ft/ft) 0.020622 Area (sq ft) 0.54 12.24 0.23
Q Total (cfs) 69.00 Flow (cfs) 1.20 67.62 0.18
Top Width (ft) 56.82 Top Width (ft) 4.03 44.89 7.90
Vel Total (ft/s) 5.30 Avg. Vel. (ft/s) 2.23 5.52 0.80
Max Chl Dpth (ft) 0.80 Hydr. Depth (ft) 0.13 0.27 0.03
Conv. Total (cfs) 480.5 Conv. (cfs) 8.4 470.9 1.3
Length Wtd. (ft) Wetted Per. (ft) 4.04 45.94 7.90
Min Ch El (ft) 4980.00 Shear (lb/sq ft) 0.17 0.34 0.04
Alpha 1.07 Stream Power (lb/ft s) 116.30 0.00 0.00
Frctn Loss (ft) 1.66 Cum Volume (acre-ft)
C & E Loss (ft) 0.03 Cum SA (acres)
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4981.70 Element Left OB Channel Right OB
Vel Head (ft) 0.69 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4981.01 Reach Len. (ft)
Crit W.S. (ft) 4981.22 Flow Area (sq ft) 1.71 23.51 2.49
E.G. Slope (ft/ft) 0.019634 Area (sq ft) 1.71 23.51 2.49
Q Total (cfs) 175.00 Flow (cfs) 5.48 161.88 7.64
Top Width (ft) 78.19 Top Width (ft) 7.18 60.01 11.00
Vel Total (ft/s) 6.31 Avg. Vel. (ft/s) 3.20 6.89 3.06
Max Chl Dpth (ft) 1.01 Hydr. Depth (ft) 0.24 0.39 0.23
Conv. Total (cfs) 1248.9 Conv. (cfs) 39.1 1155.3 54.5
Length Wtd. (ft) Wetted Per. (ft) 7.20 61.07 11.19
Min Ch El (ft) 4980.00 Shear (lb/sq ft) 0.29 0.47 0.27
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 25 of 28
Alpha 1.12 Stream Power (lb/ft s) 116.30 0.00 0.00
Frctn Loss (ft) 1.59 Cum Volume (acre-ft)
C & E Loss (ft) 0.04 Cum SA (acres)
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4982.73 Element Left OB Channel Right OB
Vel Head (ft) 1.36 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4981.37 Reach Len. (ft)
Crit W.S. (ft) 4981.79 Flow Area (sq ft) 5.35 45.45 6.52
E.G. Slope (ft/ft) 0.016483 Area (sq ft) 5.35 45.45 6.52
Q Total (cfs) 502.00 Flow (cfs) 22.90 445.14 33.96
Top Width (ft) 83.70 Top Width (ft) 12.69 60.01 11.00
Vel Total (ft/s) 8.76 Avg. Vel. (ft/s) 4.28 9.79 5.21
Max Chl Dpth (ft) 1.37 Hydr. Depth (ft) 0.42 0.76 0.59
Conv. Total (cfs) 3910.0 Conv. (cfs) 178.4 3467.1 264.5
Length Wtd. (ft) Wetted Per. (ft) 12.72 61.07 11.55
Min Ch El (ft) 4980.00 Shear (lb/sq ft) 0.43 0.77 0.58
Alpha 1.14 Stream Power (lb/ft s) 116.30 0.00 0.00
Frctn Loss (ft) 1.28 Cum Volume (acre-ft)
C & E Loss (ft) 0.09 Cum SA (acres)
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
SUMMARY OF MANNING'S N VALUES
River:Laporte
Reach River Sta. n1 n2 n3
Howes to Whit. 2723 .06 .016 .06
Howes to Whit. 2591 .06 .016 .06
Howes to Whit. 2477 .06 .016 .06
Howes to Whit. 2301 .06 .016 .06
Howes to Whit. 2093 .06 .016 .06
Howes to Whit. 1975 .06 .016 .06
Howes to Whit. 1791 .06 .016 .06
Howes to Whit. 1599 .06 .016 .06
Howes to Whit. 1398 .025 .016 .04
Howes to Whit. 1218 .06 .016 .04
Howes to Whit. 1101 .06 .016 .04
Howes to Whit. 1017 .016 .016 .016
Howes to Whit. 896 .025 .016 .025
Howes to Whit. 766 .025 .016 .025
Alpha 1.34 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.18 Cum Volume (acre-ft) 0.09 1.44 0.08
C & E Loss (ft) 0.06 Cum SA (acres) 0.14 1.95 0.26
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 19 of 28
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1101
INPUT
Description: Cross Section 11+01
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 20 4985 40 4984 40 4983.25 70 4983.83
103 4983.25 103 4984 125 4985 163 4986 188 4987
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 40 .016 103 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
40 103 84 84 84 .1 .3
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4995 148 188 4995
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4984.13 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.94 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4983.94 Flow Area (sq ft) 25.16
E.G. Slope (ft/ft) 0.004963 Area (sq ft) 25.16
Q Total (cfs) 88.00 Flow (cfs) 88.00
Top Width (ft) 63.00 Top Width (ft) 63.00
Vel Total (ft/s) 3.50 Avg. Vel. (ft/s) 3.50
Max Chl Dpth (ft) 0.69 Hydr. Depth (ft) 0.40
Conv. Total (cfs) 1249.1 Conv. (cfs) 1249.1
Length Wtd. (ft) 84.00 Wetted Per. (ft) 64.39
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.12
Alpha 1.00 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.32 Cum Volume (acre-ft) 0.01 0.19 0.00
C & E Loss (ft) 0.04 Cum SA (acres) 0.05 0.74 0.04
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #10-YR
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 20 of 28
E.G. Elev (ft) 4984.52 Element Left OB Channel Right OB
Vel Head (ft) 0.32 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4984.19 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4984.19 Flow Area (sq ft) 0.38 41.22 0.42
E.G. Slope (ft/ft) 0.004366 Area (sq ft) 0.38 41.22 0.42
Q Total (cfs) 188.00 Flow (cfs) 0.13 187.65 0.22
Top Width (ft) 71.16 Top Width (ft) 3.89 63.00 4.28
Vel Total (ft/s) 4.47 Avg. Vel. (ft/s) 0.35 4.55 0.52
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.10 0.65 0.10
Conv. Total (cfs) 2845.2 Conv. (cfs) 2.0 2840.0 3.3
Length Wtd. (ft) 84.00 Wetted Per. (ft) 3.89 64.51 4.28
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.03 0.17 0.03
Alpha 1.03 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.26 Cum Volume (acre-ft) 0.03 0.41 0.01
C & E Loss (ft) 0.07 Cum SA (acres) 0.07 1.05 0.05
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4985.36 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4984.73 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4984.80 Flow Area (sq ft) 5.31 74.87 5.84
E.G. Slope (ft/ft) 0.003921 Area (sq ft) 5.31 74.87 5.84
Q Total (cfs) 492.00 Flow (cfs) 4.19 480.88 6.92
Top Width (ft) 93.60 Top Width (ft) 14.57 63.00 16.03
Vel Total (ft/s) 5.72 Avg. Vel. (ft/s) 0.79 6.42 1.19
Max Chl Dpth (ft) 1.48 Hydr. Depth (ft) 0.36 1.19 0.36
Conv. Total (cfs) 7857.1 Conv. (cfs) 67.0 7679.6 110.5
Length Wtd. (ft) 84.00 Wetted Per. (ft) 14.59 64.51 16.04
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.09 0.28 0.09
Alpha 1.23 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 0.07 1.27 0.07
C & E Loss (ft) 0.16 Cum SA (acres) 0.09 1.79 0.21
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1017
INPUT
Description: Cross Section 10+17
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4984.4 125.2 4984 437.8 4983 467.7 4983 485.2 4983.16
505.2 4983.13 525.2 4983.25 535.2 4983.45 644.1 4984 814.8 4985
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .016 0 .016 814.8 .016
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 21 of 28
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
0 814.8 121 121 121 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 375.2 4990 F
676.2 814.8 4990 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4983.40 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.34 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.28 Flow Area (sq ft) 37.04
E.G. Slope (ft/ft) 0.002704 Area (sq ft) 40.15
Q Total (cfs) 69.00 Flow (cfs) 69.00
Top Width (ft) 198.65 Top Width (ft) 198.65
Vel Total (ft/s) 1.86 Avg. Vel. (ft/s) 1.86
Max Chl Dpth (ft) 0.34 Hydr. Depth (ft) 0.24
Conv. Total (cfs) 1327.0 Conv. (cfs) 1327.0
Length Wtd. (ft) 121.00 Wetted Per. (ft) 154.56
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.04
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.42 Cum Volume (acre-ft) 0.01 0.13 0.00
C & E Loss (ft) 0.01 Cum SA (acres) 0.05 0.49 0.04
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4983.67 Element Left OB Channel Right OB
Vel Head (ft) 0.08 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.59 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.45 Flow Area (sq ft) 77.80
E.G. Slope (ft/ft) 0.001889 Area (sq ft) 101.11
Q Total (cfs) 175.00 Flow (cfs) 175.00
Top Width (ft) 307.70 Top Width (ft) 307.70
Vel Total (ft/s) 2.25 Avg. Vel. (ft/s) 2.25
Max Chl Dpth (ft) 0.59 Hydr. Depth (ft) 0.42
Conv. Total (cfs) 4026.7 Conv. (cfs) 4026.7
Length Wtd. (ft) 121.00 Wetted Per. (ft) 186.99
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.05
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.33 Cum Volume (acre-ft) 0.03 0.27 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.07 0.69 0.05
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4984.29 Element Left OB Channel Right OB
Vel Head (ft) 0.07 Wt. n-Val. 0.016
W.S. Elev (ft) 4984.21 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.81 Flow Area (sq ft) 233.28
E.G. Slope (ft/ft) 0.000754 Area (sq ft) 393.78
Q Total (cfs) 502.00 Flow (cfs) 502.00
Conv. Total (cfs) 836.4 Conv. (cfs) 836.4
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 15 of 28
Length Wtd. (ft) 201.00 Wetted Per. (ft) 58.71
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.03
Alpha 1.00 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.41 Cum Volume (acre-ft) 0.05 0.79 0.05
C & E Loss (ft) 0.02 Cum SA (acres) 0.14 1.72 0.22
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4987.78 Element Left OB Channel Right OB
Vel Head (ft) 0.09 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4987.70 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4987.32 Flow Area (sq ft) 6.60 53.49 3.55
E.G. Slope (ft/ft) 0.000780 Area (sq ft) 30.67 53.49 7.82
Q Total (cfs) 133.00 Flow (cfs) 2.46 129.67 0.87
Top Width (ft) 211.78 Top Width (ft) 107.10 57.80 46.88
Vel Total (ft/s) 2.09 Avg. Vel. (ft/s) 0.37 2.42 0.24
Max Chl Dpth (ft) 1.20 Hydr. Depth (ft) 0.40 0.93 0.21
Conv. Total (cfs) 4760.6 Conv. (cfs) 88.1 4641.5 31.0
Length Wtd. (ft) 201.00 Wetted Per. (ft) 16.70 59.22 17.00
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.02 0.04 0.01
Alpha 1.31 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.25 Cum Volume (acre-ft) 0.22 2.00 0.28
C & E Loss (ft) 0.04 Cum SA (acres) 0.49 2.46 0.77
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1398
INPUT
Description: Cross Section 13+98
Station Elevation Data num= 19
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988 10 4988 12 4987 17 4986 63 4986
74 4986.13 74 4987.45 75 4987.45 75 4987 90 4986
90 4985.25 112 4986 120 4986.05 130 4986 150 4985.25
150 4986 170 4986.24 235 4987 335 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 90 .016 150 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
90 150 180 180 180 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
170 335 4995 F
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 16 of 28
Left Levee Station= 75 Elevation= 4987.45
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4986.35 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.16 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.16 Flow Area (sq ft) 0.18 24.68 1.02
E.G. Slope (ft/ft) 0.004915 Area (sq ft) 0.18 24.68 1.02
Q Total (cfs) 88.00 Flow (cfs) 0.14 87.38 0.48
Top Width (ft) 75.35 Top Width (ft) 2.34 60.00 13.01
Vel Total (ft/s) 3.40 Avg. Vel. (ft/s) 0.76 3.54 0.48
Max Chl Dpth (ft) 0.91 Hydr. Depth (ft) 0.08 0.41 0.08
Conv. Total (cfs) 1255.2 Conv. (cfs) 2.0 1246.4 6.9
Length Wtd. (ft) 180.00 Wetted Per. (ft) 2.35 61.53 13.01
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.02 0.12 0.02
Alpha 1.08 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.88 Cum Volume (acre-ft) 0.02 0.33 0.00
C & E Loss (ft) 0.00 Cum SA (acres) 0.08 1.09 0.07
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4986.71 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.43 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.43 Flow Area (sq ft) 1.39 41.14 6.21
E.G. Slope (ft/ft) 0.003782 Area (sq ft) 1.39 41.14 7.76
Q Total (cfs) 188.00 Flow (cfs) 1.82 179.67 6.51
Top Width (ft) 102.75 Top Width (ft) 6.46 60.00 36.29
Vel Total (ft/s) 3.86 Avg. Vel. (ft/s) 1.31 4.37 1.05
Max Chl Dpth (ft) 1.18 Hydr. Depth (ft) 0.22 0.69 0.31
Conv. Total (cfs) 3057.1 Conv. (cfs) 29.7 2921.7 105.8
Length Wtd. (ft) 180.00 Wetted Per. (ft) 6.47 61.53 20.00
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.05 0.16 0.07
Alpha 1.23 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 0.04 0.65 0.03
C & E Loss (ft) 0.01 Cum SA (acres) 0.13 1.45 0.13
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 17 of 28
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4987.49 Element Left OB Channel Right OB
Vel Head (ft) 0.51 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.97 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.97 Flow Area (sq ft) 7.11 73.72 17.07
E.G. Slope (ft/ft) 0.003307 Area (sq ft) 7.11 73.72 40.08
Q Total (cfs) 492.00 Flow (cfs) 15.02 444.17 32.81
Top Width (ft) 157.35 Top Width (ft) 14.60 60.00 82.74
Vel Total (ft/s) 5.03 Avg. Vel. (ft/s) 2.11 6.03 1.92
Max Chl Dpth (ft) 1.72 Hydr. Depth (ft) 0.49 1.23 0.85
Conv. Total (cfs) 8555.0 Conv. (cfs) 261.1 7723.3 570.6
Length Wtd. (ft) 180.00 Wetted Per. (ft) 14.64 61.53 20.00
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.10 0.25 0.18
Alpha 1.31 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.58 Cum Volume (acre-ft) 0.13 1.70 0.17
C & E Loss (ft) 0.00 Cum SA (acres) 0.21 2.19 0.47
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1218
INPUT
Description: Cross Section 12+18
Station Elevation Data num= 13
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 26 4985 44 4984 44 4983.25 71 4984.58
100 4984 100 4984.75 103 4985 112 4985 118 4985
121 4986 170 4987 197 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 44 .016 100 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
44 100 117 117 117 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
121 197 4995 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4984.81 Element Left OB Channel Right OB
Vel Head (ft) 0.44 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4984.37 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4984.52 Flow Area (sq ft) 1.25 16.24
E.G. Slope (ft/ft) 0.011986 Area (sq ft) 1.25 16.24
Q Total (cfs) 88.00 Flow (cfs) 1.10 86.90
Top Width (ft) 48.08 Top Width (ft) 6.70 41.38
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 11 of 28
Warning: The energy equation could not be balanced within the specified number of iterations.
The program selected the water
surface that had the least amount of error between computed and assumed values.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4990.86 Element Left OB Channel Right OB
Vel Head (ft) 0.34 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.52 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4990.61 Flow Area (sq ft) 0.54 6.13 0.67
E.G. Slope (ft/ft) 0.021619 Area (sq ft) 0.54 6.13 0.67
Q Total (cfs) 31.00 Flow (cfs) 0.69 29.45 0.85
Top Width (ft) 35.12 Top Width (ft) 2.60 29.32 3.20
Vel Total (ft/s) 4.22 Avg. Vel. (ft/s) 1.27 4.81 1.28
Max Chl Dpth (ft) 0.42 Hydr. Depth (ft) 0.21 0.21 0.21
Conv. Total (cfs) 210.8 Conv. (cfs) 4.7 200.3 5.8
Length Wtd. (ft) 184.00 Wetted Per. (ft) 2.63 29.33 3.23
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.28 0.28 0.28
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 1.91 Cum Volume (acre-ft) 0.05 0.89 0.05
C & E Loss (ft) 0.00 Cum SA (acres) 0.15 2.09 0.22
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4991.47 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.84 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4991.01 Flow Area (sq ft) 1.72 19.37 2.12
E.G. Slope (ft/ft) 0.018484 Area (sq ft) 1.72 19.37 2.12
Q Total (cfs) 133.00 Flow (cfs) 2.97 126.37 3.66
Top Width (ft) 62.45 Top Width (ft) 4.62 52.13 5.70
Vel Total (ft/s) 5.73 Avg. Vel. (ft/s) 1.73 6.52 1.73
Max Chl Dpth (ft) 0.74 Hydr. Depth (ft) 0.37 0.37 0.37
Conv. Total (cfs) 978.3 Conv. (cfs) 21.8 929.5 27.0
Length Wtd. (ft) 184.00 Wetted Per. (ft) 4.68 52.15 5.75
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.42 0.43 0.43
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 1.89 Cum Volume (acre-ft) 0.30 2.27 0.30
C & E Loss (ft) 0.00 Cum SA (acres) 0.84 2.94 0.88
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 12 of 28
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1791
INPUT
Description: Laporte between Meldrum and Sherwood
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988.8 34.9 4988.6 35 4987.8 38 4988 66.1 4988.6
91.7 4988 91.8 4988.8 94.5 4989 113.1 4989.2
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 34.9 .016 91.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
34.9 91.8 192 192 192 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 19 4999 F
110 113.1 4999 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4988.10 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.016
W.S. Elev (ft) 4988.05 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.05 Flow Area (sq ft) 0.57
E.G. Slope (ft/ft) 0.011648 Area (sq ft) 0.57
Q Total (cfs) 1.00 Flow (cfs) 1.00
Top Width (ft) 7.58 Top Width (ft) 7.58
Vel Total (ft/s) 1.75 Avg. Vel. (ft/s) 1.75
Max Chl Dpth (ft) 0.25 Hydr. Depth (ft) 0.08
Conv. Total (cfs) 9.3 Conv. (cfs) 9.3
Length Wtd. (ft) 192.00 Wetted Per. (ft) 7.86
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.05
Alpha 1.00 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 1.22 Cum Volume (acre-ft) 0.02 0.40 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.08 1.33 0.10
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 13 of 28
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4988.58 Element Left OB Channel Right OB
Vel Head (ft) 0.13 Wt. n-Val. 0.016
W.S. Elev (ft) 4988.45 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.45 Flow Area (sq ft) 10.53
E.G. Slope (ft/ft) 0.006755 Area (sq ft) 10.53
Q Total (cfs) 31.00 Flow (cfs) 31.00
Top Width (ft) 42.94 Top Width (ft) 42.94
Vel Total (ft/s) 2.95 Avg. Vel. (ft/s) 2.95
Max Chl Dpth (ft) 0.65 Hydr. Depth (ft) 0.25
Conv. Total (cfs) 377.2 Conv. (cfs) 377.2
Length Wtd. (ft) 192.00 Wetted Per. (ft) 43.92
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.10
Alpha 1.00 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 0.78 Cum Volume (acre-ft) 0.05 0.85 0.05
C & E Loss (ft) 0.03 Cum SA (acres) 0.14 1.94 0.22
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4989.13 Element Left OB Channel Right OB
Vel Head (ft) 0.38 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4988.75 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.84 Flow Area (sq ft) 1.58 26.50
E.G. Slope (ft/ft) 0.008260 Area (sq ft) 1.83 26.50
Q Total (cfs) 133.00 Flow (cfs) 0.76 132.24
Top Width (ft) 82.15 Top Width (ft) 25.26 56.89
Vel Total (ft/s) 4.74 Avg. Vel. (ft/s) 0.48 4.99
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.10 0.47
Conv. Total (cfs) 1463.4 Conv. (cfs) 8.4 1455.1
Length Wtd. (ft) 192.00 Wetted Per. (ft) 15.90 58.28
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.05 0.23
Alpha 1.10 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 2.27 Cum Volume (acre-ft) 0.29 2.17 0.30
C & E Loss (ft) 0.07 Cum SA (acres) 0.78 2.71 0.87
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
Max Chl Dpth (ft) 1.17 Hydr. Depth (ft) 0.08 0.36 0.57
Conv. Total (cfs) 1175.2 Conv. (cfs) 2.8 1022.4 150.1
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 7 of 28
Length Wtd. (ft) 176.00 Wetted Per. (ft) 6.80 60.73 15.41
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.13 0.53 0.85
Alpha 1.37 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.87 Cum Volume (acre-ft) 0.33 2.53 0.34
C & E Loss (ft) 0.01 Cum SA (acres) 0.97 3.57 1.05
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2301
INPUT
Description: Laporte between Sherwood and Whitcomb
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4997 25.4 4997 48.7 4996.6 48.8 4995.9 54.4 4996
78.1 4996.5 90.9 4996 107.5 4995.4 107.6 4996.1 142.8 4997
144.6 4997
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 48.7 .016 107.6 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
48.7 107.6 208 208 208 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 32.1 5007 F
123.7 144.6 5007 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4996.47 Element Left OB Channel Right OB
Vel Head (ft) 0.58 Wt. n-Val. 0.016
W.S. Elev (ft) 4995.88 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.07 Flow Area (sq ft) 3.26
E.G. Slope (ft/ft) 0.030108 Area (sq ft) 3.26
Q Total (cfs) 20.00 Flow (cfs) 20.00
Top Width (ft) 13.47 Top Width (ft) 13.47
Vel Total (ft/s) 6.13 Avg. Vel. (ft/s) 6.13
Max Chl Dpth (ft) 0.48 Hydr. Depth (ft) 0.24
Conv. Total (cfs) 115.3 Conv. (cfs) 115.3
Length Wtd. (ft) 208.00 Wetted Per. (ft) 13.90
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.44
Alpha 1.00 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.62 Cum Volume (acre-ft) 0.02 0.43 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.08 1.49 0.10
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 8 of 28
E.G. Elev (ft) 4996.93 Element Left OB Channel Right OB
Vel Head (ft) 0.80 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 4996.13 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.36 Flow Area (sq ft) 8.77 0.02
E.G. Slope (ft/ft) 0.034385 Area (sq ft) 8.77 0.02
Q Total (cfs) 63.00 Flow (cfs) 63.00 0.00
Top Width (ft) 32.87 Top Width (ft) 31.74 1.13
Vel Total (ft/s) 7.17 Avg. Vel. (ft/s) 7.18 0.27
Max Chl Dpth (ft) 0.73 Hydr. Depth (ft) 0.28 0.01
Conv. Total (cfs) 339.7 Conv. (cfs) 339.7 0.0
Length Wtd. (ft) 208.00 Wetted Per. (ft) 32.56 1.13
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.58 0.03
Alpha 1.00 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.66 Cum Volume (acre-ft) 0.05 0.97 0.05
C & E Loss (ft) 0.01 Cum SA (acres) 0.20 2.35 0.23
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4997.47 Element Left OB Channel Right OB
Vel Head (ft) 1.04 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 4996.43 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.73 Flow Area (sq ft) 21.63 2.12
E.G. Slope (ft/ft) 0.027272 Area (sq ft) 21.63 2.12
Q Total (cfs) 181.00 Flow (cfs) 178.39 2.61
Top Width (ft) 66.63 Top Width (ft) 53.74 12.89
Vel Total (ft/s) 7.62 Avg. Vel. (ft/s) 8.25 1.23
Max Chl Dpth (ft) 1.03 Hydr. Depth (ft) 0.40 0.16
Conv. Total (cfs) 1096.0 Conv. (cfs) 1080.2 15.8
Length Wtd. (ft) 208.00 Wetted Per. (ft) 54.83 12.90
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.67 0.28
Alpha 1.16 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.49 Cum Volume (acre-ft) 0.33 2.45 0.31
C & E Loss (ft) 0.03 Cum SA (acres) 0.96 3.34 0.96
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2093
INPUT
Description: West of Sherwood and Laporte intersection
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4993.2 7 4993 51.5 4992.2 51.6 4991.5 59.1 4992
79 4992.8 103.6 4992 108.3 4991.8 108.4 4992.5 132.2 4993
144.2 4993.4
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 9 of 28
0 .06 51.5 .016 108.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
51.5 108.4 118 118 118 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 31.5 5003 F
124.5 144.2 5003 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4992.40 Element Left OB Channel Right OB
Vel Head (ft) 0.23 Wt. n-Val. 0.016
W.S. Elev (ft) 4992.17 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.24 Flow Area (sq ft) 5.21
E.G. Slope (ft/ft) 0.012077 Area (sq ft) 5.21
Q Total (cfs) 20.00 Flow (cfs) 20.00
Top Width (ft) 21.67 Top Width (ft) 21.67
Vel Total (ft/s) 3.84 Avg. Vel. (ft/s) 3.84
Max Chl Dpth (ft) 0.67 Hydr. Depth (ft) 0.24
Conv. Total (cfs) 182.0 Conv. (cfs) 182.0
Length Wtd. (ft) 118.00 Wetted Per. (ft) 22.59
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.17
Alpha 1.00 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 3.97 Cum Volume (acre-ft) 0.02 0.41 0.01
C & E Loss (ft) 0.11 Cum SA (acres) 0.08 1.40 0.10
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4992.78 Element Left OB Channel Right OB
Vel Head (ft) 0.35 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4992.44 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.55 Flow Area (sq ft) 1.55 13.06
E.G. Slope (ft/ft) 0.010820 Area (sq ft) 1.55 13.06
Q Total (cfs) 63.00 Flow (cfs) 0.96 62.04
Top Width (ft) 49.83 Top Width (ft) 13.15 36.68
Vel Total (ft/s) 4.31 Avg. Vel. (ft/s) 0.62 4.75
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.12 0.36
Conv. Total (cfs) 605.7 Conv. (cfs) 9.3 596.4
Length Wtd. (ft) 118.00 Wetted Per. (ft) 13.15 37.87
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.08 0.23
Alpha 1.20 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 4.01 Cum Volume (acre-ft) 0.05 0.91 0.05
C & E Loss (ft) 0.14 Cum SA (acres) 0.17 2.18 0.23
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
W.S. Elev (ft) 5003.93 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5003.97 Flow Area (sq ft) 12.86
E.G. Slope (ft/ft) 0.007988 Area (sq ft) 12.86
Q Total (cfs) 44.00 Flow (cfs) 44.00
Top Width (ft) 47.61 Top Width (ft) 47.61
Vel Total (ft/s) 3.42 Avg. Vel. (ft/s) 3.42
Max Chl Dpth (ft) 0.73 Hydr. Depth (ft) 0.27
Conv. Total (cfs) 492.3 Conv. (cfs) 492.3
Length Wtd. (ft) 132.00 Wetted Per. (ft) 48.56
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.13
Alpha 1.00 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.02 0.50 0.01
C & E Loss (ft) Cum SA (acres) 0.08 1.74 0.12
Warning: Divided flow computed for this cross-section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5004.39 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5004.10 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5004.16 Flow Area (sq ft) 22.47 1.16
E.G. Slope (ft/ft) 0.008016 Area (sq ft) 22.47 1.16
Q Total (cfs) 97.00 Flow (cfs) 96.47 0.53
Top Width (ft) 71.91 Top Width (ft) 59.36 12.55
Vel Total (ft/s) 4.11 Avg. Vel. (ft/s) 4.29 0.45
Max Chl Dpth (ft) 0.90 Hydr. Depth (ft) 0.38 0.09
Conv. Total (cfs) 1083.4 Conv. (cfs) 1077.5 5.9
Length Wtd. (ft) 132.00 Wetted Per. (ft) 60.53 12.55
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.19 0.05
Alpha 1.09 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.05 1.11 0.07
C & E Loss (ft) Cum SA (acres) 0.20 2.74 0.32
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5004.99 Element Left OB Channel Right OB
Vel Head (ft) 0.60 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5004.40 Reach Len. (ft) 132.00 132.00 132.00
Crit W.S. (ft) 5004.54 Flow Area (sq ft) 39.86 5.54
E.G. Slope (ft/ft) 0.008001 Area (sq ft) 39.86 5.90
Q Total (cfs) 256.00 Flow (cfs) 249.84 6.16
Top Width (ft) 79.20 Top Width (ft) 59.40 19.80
Vel Total (ft/s) 5.64 Avg. Vel. (ft/s) 6.27 1.11
Max Chl Dpth (ft) 1.20 Hydr. Depth (ft) 0.67 0.36
Conv. Total (cfs) 2862.0 Conv. (cfs) 2793.1 68.9
Length Wtd. (ft) 132.00 Wetted Per. (ft) 60.83 15.60
Min Ch El (ft) 5003.20 Shear (lb/sq ft) 0.33 0.18
Alpha 1.21 Stream Power (lb/ft s) 144.10 0.00 0.00
Frctn Loss (ft) Cum Volume (acre-ft) 0.33 2.73 0.38
C & E Loss (ft) Cum SA (acres) 0.98 3.90 1.18
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 4 of 28
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2591
INPUT
Description: West of Whitcomb and Laporte intersection
The floodplain at this
cross-section was plotted based on an interpolated gutter flowline
elevation and a field measured curb height. See project
description for further details.
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5003.3 48 5003.3 48.1 5002.5 77.1 5002.9 104 5002
106.7 5001.9 106.8 5002.7 116.9 5003 133.5 5003.3
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 48 .016 106.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
48 106.8 114 114 114 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 30.4 5013 F
122.2 133.5 5013 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 5002.95 Element Left OB Channel Right OB
Vel Head (ft) 0.24 Wt. n-Val. 0.016 0.000
W.S. Elev (ft) 5002.71 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5002.79 Flow Area (sq ft) 11.30 0.00
E.G. Slope (ft/ft) 0.009592 Area (sq ft) 11.30 0.00
Q Total (cfs) 44.00 Flow (cfs) 44.00 0.00
Top Width (ft) 39.87 Top Width (ft) 39.47 0.39
Vel Total (ft/s) 3.89 Avg. Vel. (ft/s) 3.89 0.08
Max Chl Dpth (ft) 0.81 Hydr. Depth (ft) 0.29 0.01
Conv. Total (cfs) 449.3 Conv. (cfs) 449.3 0.0
Length Wtd. (ft) 114.00 Wetted Per. (ft) 40.38 0.39
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.17
Alpha 1.00 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.16 Cum Volume (acre-ft) 0.02 0.46 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.08 1.61 0.12
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5003.23 Element Left OB Channel Right OB
Vel Head (ft) 0.32 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5002.91 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5002.99 Flow Area (sq ft) 21.31 0.76
E.G. Slope (ft/ft) 0.009434 Area (sq ft) 21.31 0.76
Q Total (cfs) 97.00 Flow (cfs) 96.59 0.41
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Page 5 of 28
Top Width (ft) 65.92 Top Width (ft) 58.75 7.17
Vel Total (ft/s) 4.39 Avg. Vel. (ft/s) 4.53 0.54
Max Chl Dpth (ft) 1.01 Hydr. Depth (ft) 0.36 0.11
Conv. Total (cfs) 998.7 Conv. (cfs) 994.4 4.2
Length Wtd. (ft) 114.00 Wetted Per. (ft) 59.84 7.18
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.21 0.06
Alpha 1.06 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.15 Cum Volume (acre-ft) 0.05 1.04 0.06
C & E Loss (ft) 0.00 Cum SA (acres) 0.20 2.56 0.29
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5003.86 Element Left OB Channel Right OB
Vel Head (ft) 0.66 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5003.20 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5003.38 Flow Area (sq ft) 38.36 4.39
E.G. Slope (ft/ft) 0.009079 Area (sq ft) 38.36 4.71
Q Total (cfs) 256.00 Flow (cfs) 251.52 4.48
Top Width (ft) 80.13 Top Width (ft) 58.79 21.35
Vel Total (ft/s) 5.99 Avg. Vel. (ft/s) 6.56 1.02
Max Chl Dpth (ft) 1.30 Hydr. Depth (ft) 0.65 0.28
Conv. Total (cfs) 2686.6 Conv. (cfs) 2639.6 47.1
Length Wtd. (ft) 114.00 Wetted Per. (ft) 60.13 15.41
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.36 0.16
Alpha 1.18 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.13 Cum Volume (acre-ft) 0.33 2.61 0.36
C & E Loss (ft) 0.01 Cum SA (acres) 0.98 3.72 1.12
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2477
INPUT
Description: East of Whitcomb and Laporte intersection
Station Elevation Data num= 8
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5001.5 16 5001.1 46.5 5001.2 52.7 5001 76.3 5000.1
76.4 5000.5 95.8 5001 114.3 5001.4
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 16 .016 76.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
16 76.4 176 176 176 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5011 F
91.8 114.3 5011 F
CROSS SECTION OUTPUT Profile #2-YR
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Page 28 of 28
Howes to Whit. 2301 2-YR 20.00 4995.40 4995.88 4996.07
4996.47 0.030108 6.13 3.26 13.47 2.20
Howes to Whit. 2301 10-YR 63.00 4995.40 4996.13 4996.36
4996.93 0.034385 7.18 8.79 32.87 2.41
Howes to Whit. 2301 100-YR 181.00 4995.40 4996.43 4996.73
4997.47 0.027272 8.25 23.75 66.63 2.29
Howes to Whit. 2477 2-YR 20.00 5000.10 5000.62 5000.78
5001.10 0.022342 5.57 3.84 18.33 1.92
Howes to Whit. 2477 10-YR 63.00 5000.10 5000.91 5001.20
5001.60 0.018579 6.86 11.85 37.13 1.90
Howes to Whit. 2477 100-YR 181.00 5000.10 5001.27 5001.50
5001.99 0.023719 7.22 31.18 99.09 2.12
Howes to Whit. 2591 2-YR 44.00 5001.90 5002.71 5002.79
5002.95 0.009592 3.89 11.31 39.87 1.28
Howes to Whit. 2591 10-YR 97.00 5001.90 5002.91 5002.99
5003.23 0.009434 4.53 22.08 65.92 1.33
Howes to Whit. 2591 100-YR 256.00 5001.90 5003.20 5003.38
5003.86 0.009079 6.56 42.75 80.13 1.43
Howes to Whit. 2723 2-YR 44.00 5003.20 5003.93 5003.97
5004.11 0.007988 3.42 12.86 47.61 1.16
Howes to Whit. 2723 10-YR 97.00 5003.20 5004.10 5004.16
5004.39 0.008016 4.29 23.63 71.91 1.23
Howes to Whit. 2723 100-YR 256.00 5003.20 5004.40 5004.54
5004.99 0.008001 6.27 45.41 79.20 1.35
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Page 1 of 28
HEC-RAS Version 4.1.0 Jan 2010
U.S. Army Corps of Engineers
Hydrologic Engineering Center
609 Second Street
Davis, California
X X XXXXXX XXXX XXXX XX XXXX
X X X X X X X X X X
X X X X X X X X X
XXXXXXX XXXX X XXX XXXX XXXXXX XXXX
X X X X X X X X X
X X X X X X X X X X
X X XXXXXX XXXX X X X X XXXXX
PROJECT DATA
Project Title: Laporte Street Hydraulics
Project File : Laporte_CE.prj
Run Date and Time: 4/28/2015 1:25:15 PM
Project in English units
Project Description:
Laporte Street Floodplain Model
For this hydraulic model, the gutter flowline
elevation was determined based on interpolation of the available topography in
the street. The measured curb height was then added to this elev. to determine
the elev. of the top of the curb. At some locations, this elev. was higher then
the adjacent contour behind the curb, a condition that does not reflect actual
ground conditions, so the adjacent contour behind the curb was disregarded with
ground elevations in the model defined by skipping to the next available
contour. The floodplain was plotted using this info, and at some locations
(XS's 2723 & 2591) is plotted entirely in the gutter instead of showing the
flow leaving the street, contrary to what an initial look at the WSEL and the
contours would indicate.
PLAN DATA
Plan Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Plan File : C:\temp\940-002\CE\Laporte_CE.p02
Geometry Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : C:\temp\940-002\CE\Laporte_CE.g02
Flow Title : Laporte - 2-, 10-, and 100-YR Flows (no splits)
Flow File : C:\temp\940-002\CE\Laporte_CE.f02
Plan Summary Information:
Number of: Cross Sections = 14 Multiple Openings = 0
Culverts = 0 Inline Structures = 0
Bridges = 0 Lateral Structures = 0
Computational Information
Water surface calculation tolerance = 0.01
Critical depth calculation tolerance = 0.01
Maximum number of iterations = 20
Maximum difference tolerance = 0.3
Flow tolerance factor = 0.001
Computation Options
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
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Page 24 of 28
for the water surface and continued on with the calculations.
Warning: The cross-section end points had to be extended vertically for the computed water
surface.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 766
INPUT
Description: Cross Section 7+66
Station Elevation Data num= 13
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4983 3 4981.7 9 4981.64 19 4980.74 19 4980.24
21 4980.41 49 4980.97 77 4980.41 79 4980.24 79 4980.74
90 4980.82 90 4981.49 116 4983
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 19 .016 79 .025
Bank Sta: Left Right Coeff Contr. Expan.
19 79 .1 .3
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4981.30 Element Left OB Channel Right OB
Vel Head (ft) 0.44 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4980.87 Reach Len. (ft)
Crit W.S. (ft) 4981.00 Flow Area (sq ft) 0.09 12.51 0.94
E.G. Slope (ft/ft) 0.021562 Area (sq ft) 0.09 12.51 0.94
Q Total (cfs) 69.00 Flow (cfs) 0.12 67.30 1.58
Top Width (ft) 61.89 Top Width (ft) 1.39 49.50 11.00
Vel Total (ft/s) 5.10 Avg. Vel. (ft/s) 1.37 5.38 1.69
Max Chl Dpth (ft) 0.63 Hydr. Depth (ft) 0.06 0.25 0.09
Conv. Total (cfs) 469.9 Conv. (cfs) 0.8 458.3 10.8
Length Wtd. (ft) Wetted Per. (ft) 1.39 50.53 11.05
Min Ch El (ft) 4980.24 Shear (lb/sq ft) 0.08 0.33 0.11
Alpha 1.09 Stream Power (lb/ft s) 116.00 0.00 0.00
Frctn Loss (ft) 1.77 Cum Volume (acre-ft)
C & E Loss (ft) 0.03 Cum SA (acres)
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4981.79 Element Left OB Channel Right OB
Vel Head (ft) 0.74 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4981.05 Reach Len. (ft)
Crit W.S. (ft) 4981.28 Flow Area (sq ft) 0.53 23.07 2.97
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Page 25 of 28
E.G. Slope (ft/ft) 0.021202 Area (sq ft) 0.53 23.07 2.97
Q Total (cfs) 175.00 Flow (cfs) 1.33 163.06 10.61
Top Width (ft) 74.45 Top Width (ft) 3.45 60.00 11.00
Vel Total (ft/s) 6.59 Avg. Vel. (ft/s) 2.49 7.07 3.57
Max Chl Dpth (ft) 0.81 Hydr. Depth (ft) 0.16 0.38 0.27
Conv. Total (cfs) 1201.9 Conv. (cfs) 9.1 1119.9 72.8
Length Wtd. (ft) Wetted Per. (ft) 3.46 61.03 11.23
Min Ch El (ft) 4980.24 Shear (lb/sq ft) 0.20 0.50 0.35
Alpha 1.09 Stream Power (lb/ft s) 116.00 0.00 0.00
Frctn Loss (ft) 1.65 Cum Volume (acre-ft)
C & E Loss (ft) 0.05 Cum SA (acres)
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4982.84 Element Left OB Channel Right OB
Vel Head (ft) 1.41 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4981.43 Reach Len. (ft)
Crit W.S. (ft) 4981.87 Flow Area (sq ft) 2.64 45.80 7.14
E.G. Slope (ft/ft) 0.016597 Area (sq ft) 2.64 45.80 7.14
Q Total (cfs) 502.00 Flow (cfs) 9.90 452.56 39.55
Top Width (ft) 78.66 Top Width (ft) 7.66 60.00 11.00
Vel Total (ft/s) 9.03 Avg. Vel. (ft/s) 3.75 9.88 5.54
Max Chl Dpth (ft) 1.19 Hydr. Depth (ft) 0.34 0.76 0.65
Conv. Total (cfs) 3896.6 Conv. (cfs) 76.8 3512.8 307.0
Length Wtd. (ft) Wetted Per. (ft) 7.69 61.03 11.61
Min Ch El (ft) 4980.24 Shear (lb/sq ft) 0.36 0.78 0.64
Alpha 1.11 Stream Power (lb/ft s) 116.00 0.00 0.00
Frctn Loss (ft) 1.27 Cum Volume (acre-ft)
C & E Loss (ft) 0.10 Cum SA (acres)
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
SUMMARY OF MANNING'S N VALUES
River:Laporte
Reach River Sta. n1 n2 n3
Howes to Whit. 2723 .06 .016 .06
Howes to Whit. 2591 .06 .016 .06
Howes to Whit. 2477 .06 .016 .06
Howes to Whit. 2301 .06 .016 .06
Howes to Whit. 2093 .06 .016 .06
Howes to Whit. 1975 .06 .016 .06
Howes to Whit. 1791 .06 .016 .06
Howes to Whit. 1599 .06 .016 .06
Howes to Whit. 1398 .025 .016 .04
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Page 26 of 28
Howes to Whit. 1218 .06 .016 .04
Howes to Whit. 1101 .06 .016 .04
Howes to Whit. 1017 .016 .016 .016
Howes to Whit. 896 .025 .016 .025
Howes to Whit. 766 .025 .016 .025
SUMMARY OF REACH LENGTHS
River: Laporte
Reach River Sta. Left Channel Right
Howes to Whit. 2723 132 132 132
Howes to Whit. 2591 114 114 114
Howes to Whit. 2477 176 176 176
Howes to Whit. 2301 208 208 208
Howes to Whit. 2093 118 118 118
Howes to Whit. 1975 184 184 184
Howes to Whit. 1791 192 192 192
Howes to Whit. 1599 201 201 201
Howes to Whit. 1398 180 180 180
Howes to Whit. 1218 117 117 117
Howes to Whit. 1101 84 84 84
Howes to Whit. 1017 121 121 121
Howes to Whit. 896 130 130 130
Howes to Whit. 766
SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS
River: Laporte
Reach River Sta. Contr. Expan.
Howes to Whit. 2723 .1 .3
Howes to Whit. 2591 .1 .3
Howes to Whit. 2477 .1 .3
Howes to Whit. 2301 .1 .3
Howes to Whit. 2093 .1 .3
Howes to Whit. 1975 .1 .3
Howes to Whit. 1791 .1 .3
Howes to Whit. 1599 .1 .3
Howes to Whit. 1398 .1 .3
Howes to Whit. 1218 .1 .3
Howes to Whit. 1101 .1 .3
Howes to Whit. 1017 .1 .3
Howes to Whit. 896 .1 .3
Howes to Whit. 766 .1 .3
Profile Output Table - Standard Table 1
Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G.
Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl
(cfs) (ft) (ft) (ft)
(ft) (ft/ft) (ft/s) (sq ft) (ft)
Howes to Whit. 766 2-YR 69.00 4980.24 4980.87 4981.00
4981.30 0.021562 5.38 13.54 61.89 1.89
Howes to Whit. 766 10-YR 175.00 4980.24 4981.05 4981.28
4981.79 0.021202 7.07 26.57 74.45 2.01
Page 20 of 28
E.G. Elev (ft) 4984.52 Element Left OB Channel Right OB
Vel Head (ft) 0.32 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4984.19 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4984.19 Flow Area (sq ft) 0.38 41.22 0.42
E.G. Slope (ft/ft) 0.004366 Area (sq ft) 0.38 41.22 0.42
Q Total (cfs) 188.00 Flow (cfs) 0.13 187.65 0.22
Top Width (ft) 71.16 Top Width (ft) 3.89 63.00 4.28
Vel Total (ft/s) 4.47 Avg. Vel. (ft/s) 0.35 4.55 0.52
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.10 0.65 0.10
Conv. Total (cfs) 2845.2 Conv. (cfs) 2.0 2840.0 3.3
Length Wtd. (ft) 84.00 Wetted Per. (ft) 3.89 64.51 4.28
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.03 0.17 0.03
Alpha 1.03 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.23 Cum Volume (acre-ft) 0.02 0.47 0.02
C & E Loss (ft) 0.08 Cum SA (acres) 0.07 1.14 0.05
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4985.36 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4984.73 Reach Len. (ft) 84.00 84.00 84.00
Crit W.S. (ft) 4984.80 Flow Area (sq ft) 5.31 74.87 5.84
E.G. Slope (ft/ft) 0.003921 Area (sq ft) 5.31 74.87 5.84
Q Total (cfs) 492.00 Flow (cfs) 4.19 480.88 6.92
Top Width (ft) 93.60 Top Width (ft) 14.57 63.00 16.03
Vel Total (ft/s) 5.72 Avg. Vel. (ft/s) 0.79 6.42 1.19
Max Chl Dpth (ft) 1.48 Hydr. Depth (ft) 0.36 1.19 0.36
Conv. Total (cfs) 7857.1 Conv. (cfs) 67.0 7679.6 110.5
Length Wtd. (ft) 84.00 Wetted Per. (ft) 14.59 64.51 16.04
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.09 0.28 0.09
Alpha 1.23 Stream Power (lb/ft s) 188.00 0.00 0.00
Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 0.07 1.40 0.10
C & E Loss (ft) 0.16 Cum SA (acres) 0.09 1.88 0.27
Warning: The velocity head has changed by more than 0.5 ft (0.15 m). This may indicate the need
for additional cross sections.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1017
INPUT
Description: Cross Section 10+17
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4984.4 125.2 4984 437.8 4983 467.7 4983 485.2 4983.16
505.2 4983.13 525.2 4983.25 535.2 4983.45 644.1 4984 814.8 4985
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Page 21 of 28
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .016 0 .016 814.8 .016
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
0 814.8 121 121 121 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 375.2 4990 F
676.2 814.8 4990 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4983.42 Element Left OB Channel Right OB
Vel Head (ft) 0.04 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.39 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.28 Flow Area (sq ft) 43.95
E.G. Slope (ft/ft) 0.001557 Area (sq ft) 49.33
Q Total (cfs) 69.00 Flow (cfs) 69.00
Top Width (ft) 214.76 Top Width (ft) 214.76
Vel Total (ft/s) 1.57 Avg. Vel. (ft/s) 1.57
Max Chl Dpth (ft) 0.39 Hydr. Depth (ft) 0.28
Conv. Total (cfs) 1748.6 Conv. (cfs) 1748.6
Length Wtd. (ft) 121.00 Wetted Per. (ft) 156.78
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.03
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.30 Cum Volume (acre-ft) 0.00 0.14 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.03 0.55 0.05
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4983.72 Element Left OB Channel Right OB
Vel Head (ft) 0.06 Wt. n-Val. 0.016
W.S. Elev (ft) 4983.66 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.45 Flow Area (sq ft) 92.02
E.G. Slope (ft/ft) 0.001192 Area (sq ft) 125.02
Q Total (cfs) 175.00 Flow (cfs) 175.00
Top Width (ft) 345.10 Top Width (ft) 345.10
Vel Total (ft/s) 1.90 Avg. Vel. (ft/s) 1.90
Max Chl Dpth (ft) 0.66 Hydr. Depth (ft) 0.46
Conv. Total (cfs) 5068.4 Conv. (cfs) 5068.4
Length Wtd. (ft) 121.00 Wetted Per. (ft) 201.49
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.03
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.22 Cum Volume (acre-ft) 0.02 0.31 0.02
C & E Loss (ft) 0.02 Cum SA (acres) 0.07 0.74 0.05
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
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Page 22 of 28
E.G. Elev (ft) 4984.36 Element Left OB Channel Right OB
Vel Head (ft) 0.06 Wt. n-Val. 0.016
W.S. Elev (ft) 4984.30 Reach Len. (ft) 121.00 121.00 121.00
Crit W.S. (ft) 4983.81 Flow Area (sq ft) 258.71
E.G. Slope (ft/ft) 0.000534 Area (sq ft) 448.06
Q Total (cfs) 502.00 Flow (cfs) 502.00
Top Width (ft) 662.99 Top Width (ft) 662.99
Vel Total (ft/s) 1.94 Avg. Vel. (ft/s) 1.94
Max Chl Dpth (ft) 1.30 Hydr. Depth (ft) 0.86
Conv. Total (cfs) 21718.7 Conv. (cfs) 21718.7
Length Wtd. (ft) 121.00 Wetted Per. (ft) 301.01
Min Ch El (ft) 4983.00 Shear (lb/sq ft) 0.03
Alpha 1.00 Stream Power (lb/ft s) 814.80 0.00 0.00
Frctn Loss (ft) 0.11 Cum Volume (acre-ft) 0.06 0.90 0.10
C & E Loss (ft) 0.03 Cum SA (acres) 0.07 1.18 0.26
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 896
INPUT
Description: Cross section 8+96
Station Elevation Data num= 14
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4983 11 4983 22 4982.7 22 4982.2 24 4982.37
52 4982.93 80 4982.37 82 4982.2 82 4982.7 93 4982.81
93 4983.31 94 4983.31 193 4984 236 4985
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .025 22 .016 82 .025
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
22 82 130 130 130 .1 .3
Blocked Obstructions num= 1
Sta L Sta R Elev
0 0 4990
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4983.11 Element Left OB Channel Right OB
Vel Head (ft) 0.16 Wt. n-Val. 0.025 0.016 0.025
W.S. Elev (ft) 4982.95 Reach Len. (ft) 130.00 130.00 130.00
Crit W.S. (ft) 4982.95 Flow Area (sq ft) 1.17 19.64 2.18
E.G. Slope (ft/ft) 0.005654 Area (sq ft) 1.17 19.64 2.18
Q Total (cfs) 69.00 Flow (cfs) 1.32 64.40 3.28
Top Width (ft) 80.28 Top Width (ft) 9.28 60.00 11.00
Vel Total (ft/s) 3.00 Avg. Vel. (ft/s) 1.13 3.28 1.51
Max Chl Dpth (ft) 0.75 Hydr. Depth (ft) 0.13 0.33 0.20
Conv. Total (cfs) 917.7 Conv. (cfs) 17.6 856.5 43.6
Length Wtd. (ft) 130.00 Wetted Per. (ft) 9.28 61.03 11.14
Min Ch El (ft) 4982.20 Shear (lb/sq ft) 0.04 0.11 0.07
Alpha 1.13 Stream Power (lb/ft s) 236.00 0.00 0.00
Frctn Loss (ft) 0.72 Cum Volume (acre-ft) 0.00 0.05 0.00
C & E Loss (ft) 0.00 Cum SA (acres) 0.02 0.16 0.03
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 16 of 28
Left Levee Station= 75 Elevation= 4987.45
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4986.35 Element Left OB Channel Right OB
Vel Head (ft) 0.19 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.16 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.16 Flow Area (sq ft) 0.18 24.68 1.02
E.G. Slope (ft/ft) 0.004915 Area (sq ft) 0.18 24.68 1.02
Q Total (cfs) 88.00 Flow (cfs) 0.14 87.38 0.48
Top Width (ft) 75.35 Top Width (ft) 2.34 60.00 13.01
Vel Total (ft/s) 3.40 Avg. Vel. (ft/s) 0.76 3.54 0.48
Max Chl Dpth (ft) 0.91 Hydr. Depth (ft) 0.08 0.41 0.08
Conv. Total (cfs) 1255.2 Conv. (cfs) 2.0 1246.4 6.9
Length Wtd. (ft) 180.00 Wetted Per. (ft) 2.35 61.53 13.01
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.02 0.12 0.02
Alpha 1.08 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.88 Cum Volume (acre-ft) 0.01 0.36 0.01
C & E Loss (ft) 0.00 Cum SA (acres) 0.06 1.16 0.07
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4986.71 Element Left OB Channel Right OB
Vel Head (ft) 0.28 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.43 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.43 Flow Area (sq ft) 1.39 41.14 6.21
E.G. Slope (ft/ft) 0.003782 Area (sq ft) 1.39 41.14 7.76
Q Total (cfs) 188.00 Flow (cfs) 1.82 179.67 6.51
Top Width (ft) 102.75 Top Width (ft) 6.46 60.00 36.29
Vel Total (ft/s) 3.86 Avg. Vel. (ft/s) 1.31 4.37 1.05
Max Chl Dpth (ft) 1.18 Hydr. Depth (ft) 0.22 0.69 0.31
Conv. Total (cfs) 3057.1 Conv. (cfs) 29.7 2921.7 105.8
Length Wtd. (ft) 180.00 Wetted Per. (ft) 6.47 61.53 20.00
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.05 0.16 0.07
Alpha 1.23 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.73 Cum Volume (acre-ft) 0.04 0.71 0.04
C & E Loss (ft) 0.01 Cum SA (acres) 0.13 1.53 0.13
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 17 of 28
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4987.49 Element Left OB Channel Right OB
Vel Head (ft) 0.51 Wt. n-Val. 0.025 0.016 0.040
W.S. Elev (ft) 4986.97 Reach Len. (ft) 180.00 180.00 180.00
Crit W.S. (ft) 4986.97 Flow Area (sq ft) 7.11 73.72 17.07
E.G. Slope (ft/ft) 0.003307 Area (sq ft) 7.11 73.72 40.08
Q Total (cfs) 492.00 Flow (cfs) 15.02 444.17 32.81
Top Width (ft) 157.35 Top Width (ft) 14.60 60.00 82.74
Vel Total (ft/s) 5.03 Avg. Vel. (ft/s) 2.11 6.03 1.92
Max Chl Dpth (ft) 1.72 Hydr. Depth (ft) 0.49 1.23 0.85
Conv. Total (cfs) 8555.0 Conv. (cfs) 261.1 7723.3 570.6
Length Wtd. (ft) 180.00 Wetted Per. (ft) 14.64 61.53 20.00
Min Ch El (ft) 4985.25 Shear (lb/sq ft) 0.10 0.25 0.18
Alpha 1.31 Stream Power (lb/ft s) 335.00 75.00 0.00
Frctn Loss (ft) 0.58 Cum Volume (acre-ft) 0.12 1.84 0.20
C & E Loss (ft) 0.00 Cum SA (acres) 0.21 2.28 0.53
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1218
INPUT
Description: Cross Section 12+18
Station Elevation Data num= 13
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 26 4985 44 4984 44 4983.25 71 4984.58
100 4984 100 4984.75 103 4985 112 4985 118 4985
121 4986 170 4987 197 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 44 .016 100 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
44 100 117 117 117 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
121 197 4995 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4984.81 Element Left OB Channel Right OB
Vel Head (ft) 0.44 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4984.37 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4984.52 Flow Area (sq ft) 1.25 16.24
E.G. Slope (ft/ft) 0.011986 Area (sq ft) 1.25 16.24
Q Total (cfs) 88.00 Flow (cfs) 1.10 86.90
Top Width (ft) 48.08 Top Width (ft) 6.70 41.38
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 18 of 28
Vel Total (ft/s) 5.03 Avg. Vel. (ft/s) 0.88 5.35
Max Chl Dpth (ft) 1.12 Hydr. Depth (ft) 0.19 0.39
Conv. Total (cfs) 803.8 Conv. (cfs) 10.0 793.7
Length Wtd. (ft) 117.00 Wetted Per. (ft) 6.71 42.53
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.14 0.29
Alpha 1.12 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.52 Cum Volume (acre-ft) 0.01 0.27 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.04 0.95 0.05
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4985.25 Element Left OB Channel Right OB
Vel Head (ft) 0.63 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4984.62 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4984.80 Flow Area (sq ft) 3.45 28.55
E.G. Slope (ft/ft) 0.012175 Area (sq ft) 3.45 28.55
Q Total (cfs) 188.00 Flow (cfs) 4.31 183.69
Top Width (ft) 67.14 Top Width (ft) 11.14 56.00
Vel Total (ft/s) 5.87 Avg. Vel. (ft/s) 1.25 6.43
Max Chl Dpth (ft) 1.37 Hydr. Depth (ft) 0.31 0.51
Conv. Total (cfs) 1703.8 Conv. (cfs) 39.1 1664.8
Length Wtd. (ft) 117.00 Wetted Per. (ft) 11.16 57.41
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.23 0.38
Alpha 1.17 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.44 Cum Volume (acre-ft) 0.03 0.57 0.02
C & E Loss (ft) 0.03 Cum SA (acres) 0.09 1.30 0.06
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Program found supercritical flow starting at this cross section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4986.23 Element Left OB Channel Right OB
Vel Head (ft) 1.16 Wt. n-Val. 0.060 0.016 0.040
W.S. Elev (ft) 4985.07 Reach Len. (ft) 117.00 117.00 117.00
Crit W.S. (ft) 4985.44 Flow Area (sq ft) 10.35 53.88 1.67
E.G. Slope (ft/ft) 0.009811 Area (sq ft) 10.35 53.88 1.67
Q Total (cfs) 492.00 Flow (cfs) 16.43 474.33 1.24
Top Width (ft) 94.07 Top Width (ft) 19.85 56.00 18.21
Vel Total (ft/s) 7.47 Avg. Vel. (ft/s) 1.59 8.80 0.75
Max Chl Dpth (ft) 1.82 Hydr. Depth (ft) 0.52 0.96 0.09
Conv. Total (cfs) 4967.1 Conv. (cfs) 165.8 4788.7 12.6
Length Wtd. (ft) 117.00 Wetted Per. (ft) 19.88 57.54 18.24
Min Ch El (ft) 4983.25 Shear (lb/sq ft) 0.32 0.57 0.06
Alpha 1.34 Stream Power (lb/ft s) 197.00 0.00 0.00
Frctn Loss (ft) 1.18 Cum Volume (acre-ft) 0.09 1.57 0.11
C & E Loss (ft) 0.06 Cum SA (acres) 0.14 2.04 0.32
This may indicate the need for additional cross sections.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 12 of 28
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1791
INPUT
Description: Laporte between Meldrum and Sherwood
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988.8 34.9 4988.6 35 4987.8 38 4988 66.1 4988.6
91.7 4988 91.8 4988.8 94.5 4989 113.1 4989.2
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 34.9 .016 91.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
34.9 91.8 192 192 192 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 19 4999 F
110 113.1 4999 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4988.10 Element Left OB Channel Right OB
Vel Head (ft) 0.05 Wt. n-Val. 0.016
W.S. Elev (ft) 4988.05 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.05 Flow Area (sq ft) 0.57
E.G. Slope (ft/ft) 0.011648 Area (sq ft) 0.57
Q Total (cfs) 1.00 Flow (cfs) 1.00
Top Width (ft) 7.58 Top Width (ft) 7.58
Vel Total (ft/s) 1.75 Avg. Vel. (ft/s) 1.75
Max Chl Dpth (ft) 0.25 Hydr. Depth (ft) 0.08
Conv. Total (cfs) 9.3 Conv. (cfs) 9.3
Length Wtd. (ft) 192.00 Wetted Per. (ft) 7.86
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.05
Alpha 1.00 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 1.22 Cum Volume (acre-ft) 0.01 0.42 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.06 1.41 0.10
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 13 of 28
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4988.58 Element Left OB Channel Right OB
Vel Head (ft) 0.13 Wt. n-Val. 0.016
W.S. Elev (ft) 4988.45 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.45 Flow Area (sq ft) 10.53
E.G. Slope (ft/ft) 0.006755 Area (sq ft) 10.53
Q Total (cfs) 31.00 Flow (cfs) 31.00
Top Width (ft) 42.94 Top Width (ft) 42.94
Vel Total (ft/s) 2.95 Avg. Vel. (ft/s) 2.95
Max Chl Dpth (ft) 0.65 Hydr. Depth (ft) 0.25
Conv. Total (cfs) 377.2 Conv. (cfs) 377.2
Length Wtd. (ft) 192.00 Wetted Per. (ft) 43.92
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.10
Alpha 1.00 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 0.78 Cum Volume (acre-ft) 0.04 0.91 0.05
C & E Loss (ft) 0.03 Cum SA (acres) 0.14 2.03 0.22
Warning: The energy equation could not be balanced within the specified number of iterations.
The program used critical depth
for the water surface and continued on with the calculations.
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Warning: During the standard step iterations, when the assumed water surface was set equal to
critical depth, the calculated water
surface came back below critical depth. This indicates that there is not a valid
subcritical answer. The program
defaulted to critical depth.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4989.13 Element Left OB Channel Right OB
Vel Head (ft) 0.38 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4988.75 Reach Len. (ft) 192.00 192.00 192.00
Crit W.S. (ft) 4988.84 Flow Area (sq ft) 1.58 26.50
E.G. Slope (ft/ft) 0.008260 Area (sq ft) 1.83 26.50
Q Total (cfs) 133.00 Flow (cfs) 0.76 132.24
Top Width (ft) 82.15 Top Width (ft) 25.26 56.89
Vel Total (ft/s) 4.74 Avg. Vel. (ft/s) 0.48 4.99
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.10 0.47
Conv. Total (cfs) 1463.4 Conv. (cfs) 8.4 1455.1
Length Wtd. (ft) 192.00 Wetted Per. (ft) 15.90 58.28
Min Ch El (ft) 4987.80 Shear (lb/sq ft) 0.05 0.23
Alpha 1.10 Stream Power (lb/ft s) 113.10 0.00 0.00
Frctn Loss (ft) 2.27 Cum Volume (acre-ft) 0.28 2.31 0.33
C & E Loss (ft) 0.07 Cum SA (acres) 0.78 2.81 0.93
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; APRIL 15, 2015
Page 14 of 28
RIVER: Laporte
REACH: Howes to Whit. RS: 1599
INPUT
Description: West of Meldrum and Laporte intersection
Station Elevation Data num= 13
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4988 337.6 4987.3 382 4987.3 382.1 4986.5 417.5 4987
439.7 4986.6 439.8 4987.4 469.3 4987.7 484.2 4988 505.4 4988
528.6 4987.3 562.7 4987.3 571.1 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 382 .016 439.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
382 439.8 201 201 201 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 365.3 4997 F
456.8 571.1 4997 F
Blocked Obstructions num= 5
Sta L Sta R Elev Sta L Sta R Elev Sta L Sta R Elev
142.5 192.7 4998 204.6 233.9 4998 284.7 337.6 4998
469.3 510.1 4998 528.6 562.7 4998
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4986.71 Element Left OB Channel Right OB
Vel Head (ft) 0.01 Wt. n-Val. 0.016
W.S. Elev (ft) 4986.70 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4986.64 Flow Area (sq ft) 1.72
E.G. Slope (ft/ft) 0.001045 Area (sq ft) 1.72
Q Total (cfs) 1.00 Flow (cfs) 1.00
Top Width (ft) 19.89 Top Width (ft) 19.89
Vel Total (ft/s) 0.58 Avg. Vel. (ft/s) 0.58
Max Chl Dpth (ft) 0.20 Hydr. Depth (ft) 0.09
Conv. Total (cfs) 30.9 Conv. (cfs) 30.9
Length Wtd. (ft) 201.00 Wetted Per. (ft) 20.16
Min Ch El (ft) 4986.50 Shear (lb/sq ft) 0.01
Alpha 1.00 Stream Power (lb/ft s) 571.10 0.00 0.00
Frctn Loss (ft) 0.35 Cum Volume (acre-ft) 0.01 0.42 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.06 1.35 0.10
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Note: Hydraulic jump has occurred between this cross section and the previous upstream
section.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4987.14 Element Left OB Channel Right OB
Vel Head (ft) 0.04 Wt. n-Val. 0.016
W.S. Elev (ft) 4987.10 Reach Len. (ft) 201.00 201.00 201.00
Crit W.S. (ft) 4986.98 Flow Area (sq ft) 19.06
E.G. Slope (ft/ft) 0.001374 Area (sq ft) 19.06
Q Total (cfs) 31.00 Flow (cfs) 31.00
Top Width (ft) 57.74 Top Width (ft) 57.74
Vel Total (ft/s) 1.63 Avg. Vel. (ft/s) 1.63
Max Chl Dpth (ft) 0.60 Hydr. Depth (ft) 0.33
Conv. Total (cfs) 836.4 Conv. (cfs) 836.4
NORTHERN ENGINEERING; APRIL 15, 2015
Page 8 of 28
E.G. Elev (ft) 4996.93 Element Left OB Channel Right OB
Vel Head (ft) 0.80 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 4996.13 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.36 Flow Area (sq ft) 8.77 0.02
E.G. Slope (ft/ft) 0.034385 Area (sq ft) 8.77 0.02
Q Total (cfs) 63.00 Flow (cfs) 63.00 0.00
Top Width (ft) 32.87 Top Width (ft) 31.74 1.13
Vel Total (ft/s) 7.17 Avg. Vel. (ft/s) 7.18 0.27
Max Chl Dpth (ft) 0.73 Hydr. Depth (ft) 0.28 0.01
Conv. Total (cfs) 339.7 Conv. (cfs) 339.7 0.0
Length Wtd. (ft) 208.00 Wetted Per. (ft) 32.56 1.13
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.58 0.03
Alpha 1.00 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.66 Cum Volume (acre-ft) 0.05 1.03 0.06
C & E Loss (ft) 0.01 Cum SA (acres) 0.20 2.43 0.23
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4997.47 Element Left OB Channel Right OB
Vel Head (ft) 1.04 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 4996.43 Reach Len. (ft) 208.00 208.00 208.00
Crit W.S. (ft) 4996.73 Flow Area (sq ft) 21.63 2.12
E.G. Slope (ft/ft) 0.027272 Area (sq ft) 21.63 2.12
Q Total (cfs) 181.00 Flow (cfs) 178.39 2.61
Top Width (ft) 66.63 Top Width (ft) 53.74 12.89
Vel Total (ft/s) 7.62 Avg. Vel. (ft/s) 8.25 1.23
Max Chl Dpth (ft) 1.03 Hydr. Depth (ft) 0.40 0.16
Conv. Total (cfs) 1096.0 Conv. (cfs) 1080.2 15.8
Length Wtd. (ft) 208.00 Wetted Per. (ft) 54.83 12.90
Min Ch El (ft) 4995.40 Shear (lb/sq ft) 0.67 0.28
Alpha 1.16 Stream Power (lb/ft s) 144.60 0.00 0.00
Frctn Loss (ft) 4.49 Cum Volume (acre-ft) 0.32 2.58 0.34
C & E Loss (ft) 0.03 Cum SA (acres) 0.96 3.43 1.02
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2093
INPUT
Description: West of Sherwood and Laporte intersection
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4993.2 7 4993 51.5 4992.2 51.6 4991.5 59.1 4992
79 4992.8 103.6 4992 108.3 4991.8 108.4 4992.5 132.2 4993
144.2 4993.4
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
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Page 9 of 28
0 .06 51.5 .016 108.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
51.5 108.4 118 118 118 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 31.5 5003 F
124.5 144.2 5003 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4992.40 Element Left OB Channel Right OB
Vel Head (ft) 0.23 Wt. n-Val. 0.016
W.S. Elev (ft) 4992.17 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.24 Flow Area (sq ft) 5.21
E.G. Slope (ft/ft) 0.012077 Area (sq ft) 5.21
Q Total (cfs) 20.00 Flow (cfs) 20.00
Top Width (ft) 21.67 Top Width (ft) 21.67
Vel Total (ft/s) 3.84 Avg. Vel. (ft/s) 3.84
Max Chl Dpth (ft) 0.67 Hydr. Depth (ft) 0.24
Conv. Total (cfs) 182.0 Conv. (cfs) 182.0
Length Wtd. (ft) 118.00 Wetted Per. (ft) 22.59
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.17
Alpha 1.00 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 3.97 Cum Volume (acre-ft) 0.01 0.43 0.01
C & E Loss (ft) 0.11 Cum SA (acres) 0.06 1.48 0.11
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 4992.78 Element Left OB Channel Right OB
Vel Head (ft) 0.35 Wt. n-Val. 0.060 0.016
W.S. Elev (ft) 4992.44 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.55 Flow Area (sq ft) 1.55 13.06
E.G. Slope (ft/ft) 0.010820 Area (sq ft) 1.55 13.06
Q Total (cfs) 63.00 Flow (cfs) 0.96 62.04
Top Width (ft) 49.83 Top Width (ft) 13.15 36.68
Vel Total (ft/s) 4.31 Avg. Vel. (ft/s) 0.62 4.75
Max Chl Dpth (ft) 0.94 Hydr. Depth (ft) 0.12 0.36
Conv. Total (cfs) 605.7 Conv. (cfs) 9.3 596.4
Length Wtd. (ft) 118.00 Wetted Per. (ft) 13.15 37.87
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.08 0.23
Alpha 1.20 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 4.01 Cum Volume (acre-ft) 0.04 0.98 0.06
C & E Loss (ft) 0.14 Cum SA (acres) 0.17 2.27 0.23
Warning: Divided flow computed for this cross-section.
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
LAPORTE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
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Page 10 of 28
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 4993.36 Element Left OB Channel Right OB
Vel Head (ft) 0.64 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4992.72 Reach Len. (ft) 118.00 118.00 118.00
Crit W.S. (ft) 4992.92 Flow Area (sq ft) 6.84 25.78 1.17
E.G. Slope (ft/ft) 0.013539 Area (sq ft) 7.57 25.78 1.17
Q Total (cfs) 181.00 Flow (cfs) 9.63 170.59 0.78
Top Width (ft) 92.12 Top Width (ft) 29.01 52.55 10.55
Vel Total (ft/s) 5.36 Avg. Vel. (ft/s) 1.41 6.62 0.66
Max Chl Dpth (ft) 1.22 Hydr. Depth (ft) 0.34 0.49 0.11
Conv. Total (cfs) 1555.5 Conv. (cfs) 82.8 1466.1 6.7
Length Wtd. (ft) 118.00 Wetted Per. (ft) 20.00 53.81 10.55
Min Ch El (ft) 4991.50 Shear (lb/sq ft) 0.29 0.40 0.09
Alpha 1.44 Stream Power (lb/ft s) 144.20 0.00 0.00
Frctn Loss (ft) 4.00 Cum Volume (acre-ft) 0.30 2.46 0.34
C & E Loss (ft) 0.12 Cum SA (acres) 0.89 3.18 0.96
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 1975
INPUT
Description: East of Sherwood and Laporte intersection
Station Elevation Data num= 7
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4991.1 11.9 4991 17.5 4990.1 43.1 4990.9 73.6 4990.1
80.5 4991 107.9 4991.6
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 17.5 .016 73.6 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
17.5 73.6 184 184 184 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5001 F
91.2 107.9 5001 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 4990.31 Element Left OB Channel Right OB
Vel Head (ft) 0.11 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 4990.20 Reach Len. (ft) 184.00 184.00 184.00
Crit W.S. (ft) 4990.23 Flow Area (sq ft) 0.03 0.34 0.04
E.G. Slope (ft/ft) 0.048454 Area (sq ft) 0.03 0.34 0.04
Q Total (cfs) 1.00 Flow (cfs) 0.02 0.95 0.03
Top Width (ft) 8.33 Top Width (ft) 0.62 6.95 0.76
Vel Total (ft/s) 2.42 Avg. Vel. (ft/s) 0.73 2.76 0.73
Max Chl Dpth (ft) 0.10 Hydr. Depth (ft) 0.05 0.05 0.05
Conv. Total (cfs) 4.5 Conv. (cfs) 0.1 4.3 0.1
Length Wtd. (ft) 184.00 Wetted Per. (ft) 0.62 6.96 0.77
Min Ch El (ft) 4990.10 Shear (lb/sq ft) 0.15 0.15 0.15
Alpha 1.24 Stream Power (lb/ft s) 107.90 0.00 0.00
Frctn Loss (ft) 2.08 Cum Volume (acre-ft) 0.01 0.42 0.01
C & E Loss (ft) 0.05 Cum SA (acres) 0.06 1.44 0.11
C & E Loss (ft) Cum SA (acres) 0.98 4.00 1.24
FORT COLLINS UTILITIES ADMINISTRATION BUILDING
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Page 4 of 28
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2591
INPUT
Description: West of Whitcomb and Laporte intersection
The floodplain at this
cross-section was plotted based on an interpolated gutter flowline
elevation and a field measured curb height. See project
description for further details.
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5003.3 48 5003.3 48.1 5002.5 77.1 5002.9 104 5002
106.7 5001.9 106.8 5002.7 116.9 5003 133.5 5003.3
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 48 .016 106.8 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
48 106.8 114 114 114 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 30.4 5013 F
122.2 133.5 5013 F
CROSS SECTION OUTPUT Profile #2-YR
E.G. Elev (ft) 5002.95 Element Left OB Channel Right OB
Vel Head (ft) 0.24 Wt. n-Val. 0.016 0.000
W.S. Elev (ft) 5002.71 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5002.79 Flow Area (sq ft) 11.30 0.00
E.G. Slope (ft/ft) 0.009592 Area (sq ft) 11.30 0.00
Q Total (cfs) 44.00 Flow (cfs) 44.00 0.00
Top Width (ft) 39.87 Top Width (ft) 39.47 0.39
Vel Total (ft/s) 3.89 Avg. Vel. (ft/s) 3.89 0.08
Max Chl Dpth (ft) 0.81 Hydr. Depth (ft) 0.29 0.01
Conv. Total (cfs) 449.3 Conv. (cfs) 449.3 0.0
Length Wtd. (ft) 114.00 Wetted Per. (ft) 40.38 0.39
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.17
Alpha 1.00 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.16 Cum Volume (acre-ft) 0.01 0.48 0.01
C & E Loss (ft) 0.01 Cum SA (acres) 0.06 1.69 0.12
Warning: Divided flow computed for this cross-section.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5003.23 Element Left OB Channel Right OB
Vel Head (ft) 0.32 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5002.91 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5002.99 Flow Area (sq ft) 21.31 0.76
E.G. Slope (ft/ft) 0.009434 Area (sq ft) 21.31 0.76
Q Total (cfs) 97.00 Flow (cfs) 96.59 0.41
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Page 5 of 28
Top Width (ft) 65.92 Top Width (ft) 58.75 7.17
Vel Total (ft/s) 4.39 Avg. Vel. (ft/s) 4.53 0.54
Max Chl Dpth (ft) 1.01 Hydr. Depth (ft) 0.36 0.11
Conv. Total (cfs) 998.7 Conv. (cfs) 994.4 4.2
Length Wtd. (ft) 114.00 Wetted Per. (ft) 59.84 7.18
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.21 0.06
Alpha 1.06 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.15 Cum Volume (acre-ft) 0.05 1.10 0.07
C & E Loss (ft) 0.00 Cum SA (acres) 0.20 2.65 0.29
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5003.86 Element Left OB Channel Right OB
Vel Head (ft) 0.66 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5003.20 Reach Len. (ft) 114.00 114.00 114.00
Crit W.S. (ft) 5003.38 Flow Area (sq ft) 38.36 4.39
E.G. Slope (ft/ft) 0.009079 Area (sq ft) 38.36 4.71
Q Total (cfs) 256.00 Flow (cfs) 251.52 4.48
Top Width (ft) 80.13 Top Width (ft) 58.79 21.35
Vel Total (ft/s) 5.99 Avg. Vel. (ft/s) 6.56 1.02
Max Chl Dpth (ft) 1.30 Hydr. Depth (ft) 0.65 0.28
Conv. Total (cfs) 2686.6 Conv. (cfs) 2639.6 47.1
Length Wtd. (ft) 114.00 Wetted Per. (ft) 60.13 15.41
Min Ch El (ft) 5001.90 Shear (lb/sq ft) 0.36 0.16
Alpha 1.18 Stream Power (lb/ft s) 133.50 0.00 0.00
Frctn Loss (ft) 1.13 Cum Volume (acre-ft) 0.32 2.74 0.39
C & E Loss (ft) 0.01 Cum SA (acres) 0.98 3.82 1.18
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2477
INPUT
Description: East of Whitcomb and Laporte intersection
Station Elevation Data num= 8
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5001.5 16 5001.1 46.5 5001.2 52.7 5001 76.3 5000.1
76.4 5000.5 95.8 5001 114.3 5001.4
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 16 .016 76.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
16 76.4 176 176 176 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5011 F
91.8 114.3 5011 F
CROSS SECTION OUTPUT Profile #2-YR
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Page 6 of 28
E.G. Elev (ft) 5001.10 Element Left OB Channel Right OB
Vel Head (ft) 0.48 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5000.62 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5000.78 Flow Area (sq ft) 3.56 0.28
E.G. Slope (ft/ft) 0.022342 Area (sq ft) 3.56 0.28
Q Total (cfs) 20.00 Flow (cfs) 19.84 0.16
Top Width (ft) 18.33 Top Width (ft) 13.71 4.62
Vel Total (ft/s) 5.21 Avg. Vel. (ft/s) 5.57 0.56
Max Chl Dpth (ft) 0.52 Hydr. Depth (ft) 0.26 0.06
Conv. Total (cfs) 133.8 Conv. (cfs) 132.8 1.0
Length Wtd. (ft) 176.00 Wetted Per. (ft) 14.03 4.62
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.35 0.08
Alpha 1.13 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.82 Cum Volume (acre-ft) 0.01 0.47 0.01
C & E Loss (ft) 0.02 Cum SA (acres) 0.06 1.62 0.12
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #10-YR
E.G. Elev (ft) 5001.60 Element Left OB Channel Right OB
Vel Head (ft) 0.69 Wt. n-Val. 0.016 0.060
W.S. Elev (ft) 5000.91 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5001.20 Flow Area (sq ft) 8.62 3.23
E.G. Slope (ft/ft) 0.018579 Area (sq ft) 8.62 3.23
Q Total (cfs) 63.00 Flow (cfs) 59.15 3.85
Top Width (ft) 37.13 Top Width (ft) 21.29 15.84
Vel Total (ft/s) 5.31 Avg. Vel. (ft/s) 6.86 1.19
Max Chl Dpth (ft) 0.81 Hydr. Depth (ft) 0.41 0.21
Conv. Total (cfs) 462.2 Conv. (cfs) 434.0 28.2
Length Wtd. (ft) 176.00 Wetted Per. (ft) 21.62 15.41
Min Ch El (ft) 5000.10 Shear (lb/sq ft) 0.46 0.24
Alpha 1.57 Stream Power (lb/ft s) 114.30 0.00 0.00
Frctn Loss (ft) 1.60 Cum Volume (acre-ft) 0.05 1.06 0.06
C & E Loss (ft) 0.04 Cum SA (acres) 0.20 2.54 0.26
Warning: The conveyance ratio (upstream conveyance divided by downstream conveyance) is less
than 0.7 or greater than 1.4.
This may indicate the need for additional cross sections.
Warning: The energy loss was greater than 1.0 ft (0.3 m). between the current and previous cross
section. This may indicate the
need for additional cross sections.
Note: Multiple critical depths were found at this location. The critical depth with the
lowest, valid, energy was used.
CROSS SECTION OUTPUT Profile #100-YR
E.G. Elev (ft) 5001.99 Element Left OB Channel Right OB
Vel Head (ft) 0.72 Wt. n-Val. 0.060 0.016 0.060
W.S. Elev (ft) 5001.27 Reach Len. (ft) 176.00 176.00 176.00
Crit W.S. (ft) 5001.50 Flow Area (sq ft) 0.58 21.80 8.80
E.G. Slope (ft/ft) 0.023719 Area (sq ft) 0.58 21.80 11.77
Q Total (cfs) 181.00 Flow (cfs) 0.43 157.46 23.11
Top Width (ft) 99.09 Top Width (ft) 6.80 60.40 31.89
Vel Total (ft/s) 5.81 Avg. Vel. (ft/s) 0.74 7.22 2.63
Max Chl Dpth (ft) 1.17 Hydr. Depth (ft) 0.08 0.36 0.57
Conv. Total (cfs) 1175.2 Conv. (cfs) 2.8 1022.4 150.1
FLOW DATA
Flow Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Flow File : C:\temp\940-002\DE\Laporte_DE.f02
Flow Data (cfs)
River Reach RS 2-YR 10-YR 100-YR
Laporte Howes to Whit. 2723 44 97 256
Laporte Howes to Whit. 2477 20 63 181
Laporte Howes to Whit. 1975 1 31 133
Laporte Howes to Whit. 1398 88 188 492
Laporte Howes to Whit. 1017 69 175 502
Boundary Conditions
River Reach Profile Upstream
Downstream
Laporte Howes to Whit. 2-YR Normal S = 0.008 Normal S
= 0.01
Laporte Howes to Whit. 10-YR Normal S = 0.008 Normal S
= 0.01
Laporte Howes to Whit. 100-YR Normal S = 0.008 Known WS =
4980.06
GEOMETRY DATA
Geometry Title: Laporte - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : C:\temp\940-002\DE\Laporte_DE.g02
CROSS SECTION
RIVER: Laporte
REACH: Howes to Whit. RS: 2723
INPUT
Description: Laporte between Whitcomb and Loomis
The floodplain at this
cross-section was plotted based on an interpolated gutter flowline
elevation and a field measured curb height. See project
description for further details.
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 5005.1 10.7 5005 54.9 5004.4 55 5003.6 82.2 5004
85 5004.1 86.5 5004 114.2 5003.2 114.3 5004 124.3 5004
144.1 5004.8
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 54.9 .016 114.3 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
54.9 114.3 132 132 132 .1 .3
Weir Flow
Orifice Flow
Area Inlet Performance Curve:
Inlet C2
Governing Equations:
At low flow depths, the inlet will act like a weir governed by the following equation:
* where P = 3.1416*Dia.of grate
* where H corresponds to the depth of water above the flowline
At higher flow depths, the inlet will act like an orifice governed by the following equation:
* where A equals the open area of the inlet grate
* where H corresponds to the depth of water above the centroid of the cross-sectional area (A)
The exact depth at which the inlet ceases to act like a weir, and begins to act like an orifice is unknown.
However, what is known, is that the stage-discharge curves of the weir equation and the orifice equation
will cross at a certain flow depth. The two curves can be found below:
If H > 1.792 (A/P), then the grate operates like an orifice; otherwise it operates like a weir.
Input Parameters:
Type of Grate: PERFORATED MANHOLE COVER
Diameter of Grate (ft): 0.67
Open Area of Grate (ft2): 0.23
Flowline Elevation (ft): 0.000
Clogging Factor: 20%
Depth vs. Flow:
Depth Above Inlet (ft)
Elevation
(ft)
Shallow
Weir Flow
(cfs)
Orifice
Flow
(cfs)
Actual
Flow
(cfs)
0.00 0.00 0.00 0.00 0.00
0.10 0.10 0.16 0.31 0.16 2-yr = 0.14 cfs
0.20 0.20 0.45 0.44 0.44
0.30 0.30 0.83 0.54 0.54
0.40 0.40 1.28 0.62 0.62
0.50 0.50 1.79 0.70 0.70
0.60 0.60 2.35 0.76 0.76
0.70 0.70 2.96 0.82 0.82
0.80 0.80 3.61 0.88 0.88
0.90 0.90 4.31 0.93 0.93
1.00 1.00 5.05 0.99 0.99
Q 3 . 0 P H 1 . 5
Q 0 . 67 A ( 2 gH ) 0 . 5
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
4.00
4.50
5.00
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
Discharge (cfs)
Stage (ft)
Stage -Discharge Curves
Weir Flow
Orifice Flow
Area Inlet Performance Curve:
Inlet E
Governing Equations:
At low flow depths, the inlet will act like a weir governed by the following equation:
* where P = 3.1416*Dia.of grate
* where H corresponds to the depth of water above the flowline
At higher flow depths, the inlet will act like an orifice governed by the following equation:
* where A equals the open area of the inlet grate
* where H corresponds to the depth of water above the centroid of the cross-sectional area (A)
The exact depth at which the inlet ceases to act like a weir, and begins to act like an orifice is unknown.
However, what is known, is that the stage-discharge curves of the weir equation and the orifice equation
will cross at a certain flow depth. The two curves can be found below:
If H > 1.792 (A/P), then the grate operates like an orifice; otherwise it operates like a weir.
Input Parameters:
Type of Grate: PERFORATED MANHOLE COVER
Diameter of Grate (ft): 0.5
Open Area of Grate (ft2): 0.13
Flowline Elevation (ft): 0.000
Clogging Factor: 20%
Depth vs. Flow:
Depth Above Inlet (ft)
Elevation
(ft)
Shallow
Weir Flow
(cfs)
Orifice
Flow
(cfs)
Actual
Flow
(cfs)
0.00 0.00 0.00 0.00 0.00
0.10 0.10 0.12 0.17 0.12 2-yr = 0.05 cfs
0.20 0.20 0.34 0.25 0.25
0.30 0.30 0.62 0.30 0.30
0.40 0.40 0.95 0.35 0.35
0.50 0.50 1.33 0.39 0.39
0.60 0.60 1.75 0.43 0.43
0.70 0.70 2.21 0.46 0.46
0.80 0.80 2.70 0.49 0.49
0.90 0.90 3.22 0.52 0.52
1.00 1.00 3.77 0.55 0.55
Q 3 . 0 P H 1 . 5
Q 0 . 67 A ( 2 gH ) 0 . 5
0.00
0.50
1.00
1.50
2.00
2.50
3.00
3.50
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
Discharge (cfs)
Stage (ft)
Stage -Discharge Curves
Weir Flow
Orifice Flow
(min)
10-yr
Tc
(min)
100-yr
Tc
(min)
11No0.25 0.60 0.75 55 2.00% 9.4 5.5 3.8 159 0.50% 1.41 1.9 0 0.00% N/A N/A 11 7 6
22No0.55 0.62 0.77 34 2.10% 4.7 4.1 2.8 188 0.75% 1.73 1.8 0 0.00% N/A N/A 6 6 5
OS1 OS1 No 0.25 0.39 0.48 10 2.00% 4.0 3.3 2.9 0 0.00% N/A N/A 0 0.00% N/A N/A 5 5 5
OS2 OS2 No 0.95 0.95 1.00 24 2.20% 1.1 1.1 0.7 129 0.80% 1.79 1.2 0 0.00% N/A N/A 5 5 5
OS3 OS3 No 0.95 0.95 1.00 28 1.90% 1.2 1.2 0.8 62 0.60% 1.55 0.7 0 0.00% N/A N/A 5 5 5
OS4 OS4 No 0.95 0.25 0.31 14 2.00% 0.8 4.7 4.4 0 0.00% N/A N/A 0 0.00% N/A N/A 5 5 5
DEVELOPED TIME OF CONCENTRATION COMPUTATIONS
Gutter Flow Swale Flow
Design
Point Basin
Overland Flow
ATC
April 1, 2014
Time of Concentration
(Equation RO-4)
3
1
1 . 87 1 . 1 *
S
Ti C Cf L
Rational Method Equation: Project: 940-002
Calculations By:
Date:
From Section 3.2.1 of the CFCSDDC
Rainfall Intensity:
1 1 0.93 11 7 6 0.60 0.60 0.75 2.13 4.31 9.63 1.19 2.41 6.73
2 2 0.17 6 6 5 0.62 0.62 0.77 2.67 4.72 9.95 0.29 0.51 1.33
OS1 OS1 0.01 5 5 5 0.39 0.39 0.48 2.85 4.87 9.95 0.01 0.02 0.06
OS2 OS2 0.11 5 5 5 0.95 0.95 1.00 2.85 4.87 9.95 0.29 0.49 1.05
OS3 OS3 0.05 5 5 5 0.95 0.95 1.00 2.85 4.87 9.95 0.13 0.21 0.46
OS4 OS4 0.01 5 5 5 0.25 0.25 0.31 2.85 4.87 9.95 0.00 0.01 0.02
Intensity,
i10
(in/hr)
Rainfall Intensity taken from the City of Fort Collins Storm Drainage Design Criteria (CFCSDDC), Figure 3.1
C10
Area, A
(acres)
Intensity,
i2
(in/hr)
100-yr
Tc
(min)
DEVELOPED RUNOFF COMPUTATIONS
C100
Design
Point
Flow,
Q100
(cfs)
Flow,
Q2
(cfs)
10-yr
Tc
(min)
2-yr
Tc
(min)
C2
Flow,
Q10
(cfs)
Intensity,
i100
(in/hr)
Basin(s)
ATC
April 1, 2014
Q C f C i A
Area Inlet Performance Curve:
Inlet A
Governing Equations:
At low flow depths, the inlet will act like a weir governed by the following equation:
* where P = 3.1416*Dia.of grate
* where H corresponds to the depth of water above the flowline
At higher flow depths, the inlet will act like an orifice governed by the following equation:
* where A equals the open area of the inlet grate
* where H corresponds to the depth of water above the centroid of the cross-sectional area (A)
The exact depth at which the inlet ceases to act like a weir, and begins to act like an orifice is unknown.
However, what is known, is that the stage-discharge curves of the weir equation and the orifice equation
will cross at a certain flow depth. The two curves can be found below:
If H > 1.792 (A/P), then the grate operates like an orifice; otherwise it operates like a weir.
Input Parameters:
Type of Grate: PERFORATED MANHOLE COVER
Diameter of Grate (ft): 2
Open Area of Grate (ft2): 2.04
Flowline Elevation (ft): 0.000
Clogging Factor: 20%
Depth vs. Flow:
Depth Above Inlet (ft)
Elevation
(ft)
Shallow
Weir Flow
(cfs)
Orifice
Flow
(cfs)
Actual
Flow
(cfs)
0.00 0.00 0.00 0.00 0.00
0.10 0.10 0.48 2.78 0.48
0.20 0.20 1.35 3.93 1.35
0.30 0.30 2.48 4.81 2.48
0.40 0.40 3.81 5.55 3.81
0.50 0.50 5.33 6.21 5.33
0.60 0.60 7.01 6.80 6.80 100-yr = 6.7cfs
0.70 0.70 8.83 7.35 7.35
0.80 0.80 10.79 7.85 7.85
0.90 0.90 12.88 8.33 8.33
1.00 1.00 15.08 8.78 8.78
Q 3 . 0 P H 1 . 5
Q 0 . 67 A ( 2 gH ) 0 . 5
0.00
2.00
4.00
6.00
8.00
10.00
12.00
14.00
0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00
Discharge (cfs)
Stage (ft)
Stage -Discharge Curves
Weir Flow
Orifice Flow
Runoff
Coefficient
100-year
Composite
Runoff
Coefficient
Composite
% Imperv.
1 40455 0.929 0.000 0.112 0.361 0.016 0.440 0.60 0.60 0.75 46%
2 7587 0.174 0.000 0.091 0.005 0.012 0.066 0.62 0.62 0.77 49%
OS1 522 0.012 0.000 0.004 0.000 0.003 0.005 0.39 0.39 0.48 27%
OS2 4588 0.105 0.000 0.105 0.000 0.000 0.000 0.95 0.95 1.00 90%
OS3 2012 0.046 0.000 0.046 0.000 0.000 0.000 0.95 0.95 1.00 90%
OS4 286 0.007 0.000 0.000 0.000 0.000 0.007 0.25 0.25 0.31 0%
DEVELOPED COMPOSITE % IMPERVIOUSNESS AND RUNOFF COEFFICIENT CALCULATIONS
Runoff Coefficients are taken from the City of Fort Collins Storm Drainage Design Criteria and Construction Standards, Table 3-3. % Impervious taken from UDFCD USDCM, Volume I.
10-year Cf
= 1.00
April 1, 2014