HomeMy WebLinkAbout320 MAPLE MIXED-USE - FDP - FDP160032 - SUBMITTAL DOCUMENTS - ROUND 1 - STORMWATER-RELATED DOCUMENTSAugust 3, 2016
FLOODPLAIN MODELING REPORT
MAPLE MIXED USE
Fort Collins, Colorado
Prepared for:
Alex Schuman
Schuman Companies, Inc.
605 S. College Avenue, Suite 100
Fort Collins, Colorado 80524
Prepared by:
301 N. Howes Street Suite 100
Fort Collins, Colorado 80521
Phone: 970.221.4158
www.northernengineering.com
Project Number: 574-007
This Drainage Report is consciously provided as a PDF.
Please consider the environment before printing this document in its entirety.
When a hard copy is absolutely necessary, we recommend double-sided printing.
August 3, 2016
City of Fort Collins
Stormwater Utility
700 Wood Street
Fort Collins, Colorado 80521
RE: Floodplain Modeling Report for
Maple Mixed Use
Dear Staff:
Northern Engineering is pleased to submit this Floodplain Modeling Report for your review.
This report accompanies the Final Plan submittal for the proposed Maple Mixed Use
development.
This report has been prepared in accordance with the Fort Collins Floodplain Modeling
Report Submittal Guidelines, and serves to document updated conditions for the Maple
Street floodplain.
If you should have any questions as you review this report, please feel free to contact us at
your earliest convenience.
Sincerely,
NORTHERN ENGINEERING SERVICES, INC.
Aaron Cvar, PhD, PE
Senior Project Engineer
Maple Mixed Use
TABLE OF CONTENTS
I. PROJECT DESCRIPTION AND BACKGROUND ................................................... 1
II. STUDY LIMITS AND MAPPING ........................................................................ 5
III. HYDROLOGY AND HYDRAULICS ..................................................................... 5
IV. DISCUSSION OF RESULTS .............................................................................. 6
V. REGULATION COMPLIANCE ............................................................................ 7
References ............................................................................................................... 8
APPENDICES:
APPENDIX A – Hydraulic Modeling Workmap
APPENDIX B – Annotated City Floodplain Workmap (Old Town Master Drainage Plan)
APPENDIX C.1 – BFE Comparison Table
APPENDIX C.2 – Hydraulic Modeling Output – Duplicate Effective Model
APPENDIX C.3 – Hydraulic Modeling Output – Corrected Effective Model
Maple Mixed Use
Page|1
I. PROJECT DESCRIPTION AND BACKGROUND
A. Location
1. Vicinity Map
Figure 1 – Vicinity Map
2. The Maple Mixed Use project site is located in the southwest quarter of Section 11,
Township 7 North, Range 69 West of the 6th Principal Meridian, City of Fort Collins,
County of Larimer, State of Colorado.
3. The project site (refer to Figure 1) is bordered to the north by a single family
residence; to the south by Maple Street (100’ ROW); to the east by an existing public
alley (20' Right-of-Way); and to the west by Meldrum Street (100’ ROW).
4. There are no major drainageways within or adjacent to the site.
Maple Mixed Use
Page|2
B. Description of Property
1. Maple Mixed Use is comprised of ±0.65 acres.
2. The site is currently occupied by two commercial buildings, a single family residence
and several small outbuildings.
Figure 2 – Aerial Photograph
3. The existing groundcover consists of grasses, asphalt and gravel. The existing on-site
runoff generally drains from the southwest-to-northeast east across flat grades (e.g.,
<2.00%) into the existing alley. From there it is directed to Maple Street via the
alley, and then to an existing inlet via curb and gutter on Maple. The existing inlet is
located at the intersection of Maple and Howes, at the northwest corner. From there,
the drainage continues through an existing storm system down Maple Street to a large
regional drainage culvert near Mason Street, and on to the Cache La Poudre River.
4. There are no major drainageways within or adjacent to the project site.
5. The proposed Maple Mixed Use development will consist of a single mixed-use
building. Other proposed improvements include: a new concrete parking area located
under the building, new sidewalks and new landscaping.
6. The proposed land use is mixed-use. This is a permitted use in the Downtown District
(D).
Project Site
Maple Mixed Use
Page|3
C. Floodplain
1. The subject property is not located in a FEMA regulatory floodplain. In particular, the
project site is not located within a FEMA designated 100-year floodplain per Map
Number 08069C0979H (Effective date: May 2, 2012).
Figure 3 – FEMA Firmette (Map Number 08069C0979H)
Project Site
Maple Mixed Use
Page|4
2. The project site is, however, located adjacent to a City of Fort Collins regulated Old
Town floodplain.
Figure 4 – City of Fort Collins Old Town Master Drainage Plan (May 10, 2002)
3. Our initial analysis of the Old Town Floodplain adjacent to the project site
indicated that the City floodplain and floodway limits did not necessarily match
existing observed conditions. As such, the project has completed an updated
HEC-RAS model of the Old Town Floodplain using field survey data collected by
Northern Engineering. The results of the updated modeling indicate that the limit
of the existing Old Town Floodplain adjacent to the property should more closely
follow the existing sidewalk along Maple Street.
Maple Mixed Use
Page|5
II. STUDY LIMITS AND MAPPING
A. Study Limits, Mapping
1. The project site is located at the northeast corner of Maple Street and Meldrum Street.
Three effective model cross-sections (1281, 1373, and 1481) have been modified in
this study, in order to represent updated conditions based on field survey data. These
cross-sections have been modified in the corrected effective model and include field
survey data for both left and right overbank areas as well as main channel area (Maple
Street). The surveyed portions of these three cross-sections extend to the full base
(100-year) flood elevation.
2. In this study, the corrected effective model map change is only within the left
overbank of Maple Street, as the project site is located only within this overbank area.
The annotated effective workmap provided in Appendix B shows the corrected
effective conditions map change that this study is proposing.
3. As seen in the corrected effective workmap provided in Appendix A, the corrected
effective mapping extends from effective cross-section 1281 to 1481.
4. Remapping of the effective floodplain extends only from effective cross-section 1281
to 1481.
5. All original City Basin Master Plan mapping was done on the NGVD-29 (Fort Collins
Unadjusted) datum. Modeling completed for this study remained consistent with this
original datum. It is noted that survey data for the proposed project is referenced to
the NAVD-88 datum. Datum conversion utilized for conversion from NGVD-29 (Fort
Collins Unadjusted) Datum to the NAVD-88 datum is +3.18-FT.
III. HYDROLOGY AND HYDRAULICS
A. Hydrology
1. The City of Fort Collins Old Town Master Drainage Plan, May 10, 2002, Anderson
Consulting Engineers, Inc. has been utilized for all floodplain hydrology, and no
changes are proposed with the current study.
2. A 100-year discharge of 116 cfs through the revised reach has been used, consistent
with the current effective model for Maple Street.
B. Hydraulics
1. The City of Fort Collins Old Town Master Drainage Plan, May 10, 2002, Anderson
Consulting Engineers, Inc. has been utilized as the source of baseline modeling for all
floodplain hydraulics for Maple Street.
2. The Current Effective model of Maple Street was obtained from the City of Fort Collins
Stormwater Utility in December of 2015.
3. The Current Effective model was run on the computer program HEC-RAS Version
5.0.1 by the U.S. Army Corps of Engineers and saved as the Duplicate Effective
model. Output from the Duplicate Effective model is provided in Appendix C.2.
Additionally, a summary of modeling results is shown in the BFE Comparison Table
provided in Appendix C.1.
4. A Corrected Effective model was run on the computer program HEC-RAS Version
5.0.1 by the U.S. Army Corps of Engineers, starting from the Duplicate Effective
Maple Mixed Use
Page|6
model, and modifying cross-sections 1281, 1373, and 1481. No additional cross-
sections were placed in the Corrected Effective model, and no changes to the
alignments of these cross-sections were performed.
5. The Corrected Effective model represents updated conditions within the channel and
left and right overbank areas of cross-sections 1281, 1373, and 1481 based on
recent field topographic mapping provided by Northern Engineering. As stated in
Section II.A, field survey of the site and adjacent Maple Street was done on the NAVD-
88 datum.
IV. DISCUSSION OF RESULTS
A. Effective, Duplicate Effective. and Corrected Effective Model Results
1. As shown in Table 1, below, minimal differences occur between the Effective model
and the Corrected Effective model.
2. .
Table 1 – Comparison of Effective, Duplicate
Effective and Corrected Effective Modeling Results
Corrected
Effective
Cross-Section ID
Base Flood Elevations (NAVD88) Comparisons
Effective
Duplicate
Effective
Corrected
Effective
DUP.
EFF
vs. EFF.
COR.
EFF.
vs. EFF.
BFE BFE BFE BFE BFE
1281 4986.30 4986.30 4986.17 0.00 -0.13
1373 4986.72 4986.72 4986.71 0.00 -0.01
1481 4987.43 4987.43 4987.34 0.00 -0.09
1598 4988.77 4988.77 4988.77 0.00 0.00
B. Mapping Changes
1. Please see the Hydraulic Modeling Workmap provided in Appendix A for 100-
year floodplain mapping changes that occur in the Corrected Effective model.
2. No changes are proposed to the mapped floodway within Maple Street. Only
changes to the 100-year floodplain boundary within the left overbank of Maple
Street are proposed with this study.
Maple Mixed Use
Page|7
V. REGULATION COMPLIANCE
A. Compliance with Standards
1. Floodplain design proposed with Maple Mixed Use complies with the City of Fort
Collins Master Drainage Plan for the Old Town Basin.
2. There are no FEMA regulatory floodplains associated with the Maple Mixed Use
development. However the project is impacted by the Old Town Floodplain, which is
a City Regulated floodplain. All provisions within Chapter 10 of the City Municipal
Code shall be adhered to.
Maple Mixed Use
Page|8
References
1. City of Fort Collins Old Town Master Drainage Plan, May 10, 2002, Anderson
Consulting Engineers, Inc.
2. Final Drainage Report for Maple Mixed Use, August 3, 2016, Northern Engineering.
(Currently Under Review)
APPENDIX A
Hydraulic Modeling Workmap
/
/
/ /
/
/ /
/
/ /
/ / / / / / / / /
/
/ /
/
/
/ / /
/ / / / /
/
/ / / / / /
/ /
/ / / / / / /
/
/
/
/
/
/ /
/
/
/
/
/
/
/ / / / / / / / / / / / / /
/ / /
/
/
/
/
/
/
/
/
/
/
/
/
/
/ / / / / / / / /
/
/
/
/ / / /
/
/ / / / / / / / /
/
/
/ /
/
/ / / / / / / / /
/
/ / / / / / / / /
/
APPENDIX B
Annotated City Floodplain Workmap (Old Town Master Drainage Plan)
CORRECTED EFFECTIVE
100-YR FLOODPLAIN BOUNDARY
APPENDIX C.1
BFE Comparison Table
City of Fort Collins Stormwater
Master Planning and Floodplain
Administration Division
Last Updated May, 2014
Effective
Duplicate
Effective
Corrected
Effective
Existing Proposed
DUP. EFF
vs. EFF.
COR. EFF.
vs. EFF.
EX. vs.
COR. EFF.
PP. vs.
COR. EFF.
PP. vs.
EFF.
BFE BFE BFE BFE BFE BFE BFE BFE BFE BFE
1281 1281 1281 N/A N/A N/A 4986.30 4986.30 4986.17 N/A N/A 0.00 -0.13 N/A N/A N/A
1373 1373 1373 N/A N/A N/A 4986.72 4986.72 4986.71 N/A N/A 0.00 -0.01 N/A N/A N/A
1481 1481 1481 N/A N/A N/A 4987.43 4987.43 4987.34 N/A N/A 0.00 -0.09 N/A N/A N/A
1598 1598 1598 N/A N/A N/A 4988.77 4988.77 4988.77 N/A N/A 0.00 0.00 N/A N/A N/A
Proposed
Stream
Station
Project Name :
Flooding Source:
Company:
Effective Cross-
Section ID (Letter)
Corrected Effective
Cross-Section ID
Corrected Effective
Stream Station
Existing
Cross-
Section ID
Proposed
Cross-
Section ID
BASE FLOOD ELEVATIONS (NAVD88)
Completed By:
SOURCE DATA COMPARISONS
HYDRAULIC CROSS-SECTION INFO.
BFE Comparison Table
574-007; Maple Street Floodplain Modeling
Maple Street
Northern Engineering
ATC
APPENDIX C.2
Hydraulic Modeling Output – Duplicate Effective Model
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 1 of 8
HEC-RAS HEC-RAS 5.0.1 April 2016
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: Maple Street Hydraulics
Project File : MapleDE.prj
Run Date and Time: 7/26/2016 2:07:28 PM
Project in English units
PLAN DATA
Plan Title: Maple - 2-, 10-, and 100-YR Flows (no splits)
Plan File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\DE\MapleDE.p02
Geometry Title: Maple - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\DE\MapleDE.g02
Flow Title : Maple - 2-, 10-, and 100-YR Flows (no splits)
Flow File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\DE\MapleDE.f02
Plan Summary Information:
Number of: Cross Sections = 13 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
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: Maple - 2-, 10-, and 100-YR Flows (no splits)
Flow File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\DE\MapleDE.f02
Flow Data (cfs)
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 2 of 8
River Reach RS 2-YR 10-YR 100-YR
Maple Howes to Whit. 2458 29 60 172
Maple Howes to Whit. 1977 39 83 234
Maple Howes to Whit. 1481 2 18 116
Maple Howes to Whit. 1018 1 1 27
Maple Howes to Whit. 783 7 13 32
Boundary Conditions
River Reach Profile Upstream
Downstream
Maple Howes to Whit. 2-YR Normal S = 0.0047
Critical
Maple Howes to Whit. 10-YR Normal S = 0.0047
Critical
Maple Howes to Whit. 100-YR Normal S = 0.0047 Known WS =
4982.38
GEOMETRY DATA
Geometry Title: Maple - 2-, 10-, and 100-YR Flows (no splits)
Geometry File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\DE\MapleDE.g02
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 2458
INPUT
Description: East of Maple and Whitcomb intersection
Station Elevation Data num= 14
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4993.1 3.4 4993 14.8 4992 34.7 4991.4 34.8 4990.9
37.5 4991 58.4 4992 64.9 4992.3 73.1 4992 92.8 4991.3
92.9 4991.8 100.8 4992 125.8 4992.2 215.8 4993
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 34.7 .016 92.9 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
34.7 92.9 208 208 208 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 19.4 5002 F
108 215.8 5002 F
Blocked Obstructions num= 1
Sta L Sta R Elev
147.2 199.9 5002
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 2250
INPUT
Description: Maple between Sherwood and Whitcomb
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4992 110.3 4991 243.9 4990.8 274.7 4990.8 274.8 4990.3
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 3 of 8
303.8 4990.9 333.2 4990.1 333.3 4990.6 341.1 4991 374.5 4991
485.2 4991 668.2 4992
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 274.7 .016 333.3 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
274.7 333.3 147 147 147 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 259 5001 F
350 668.2 5001 F
Blocked Obstructions num= 3
Sta L Sta R Elev Sta L Sta R Elev Sta L Sta R Elev
68.2 151.7 5001 200.6 244.5 5001 374.1 601 5001
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 2103
INPUT
Description: West of Maple and Sherwood intersection
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4991 71.8 4990.4 105.8 4990.4 105.9 4989.9 115.1 4990
130.5 4990.4 146.3 4990 161.8 4989.5 161.9 4990 169.5 4990
194.3 4990.5 236.1 4991
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 105.8 .016 161.9 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
105.8 161.9 126 126 126 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 87.7 5000 F
178.7 236.1 5000 F
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
13.9 70.2 5000 194.9 222.5 5000
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1977
INPUT
Description: East of Maple and Sherwood intersection
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4989.4 14.6 4989.4 14.7 4988.9 16.3 4989 40.5 4989.9
66.9 4989 70.3 4988.6 70.4 4989.1 85.8 4990
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 14.6 .016 70.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
14.6 70.4 186 186 186 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5000 F
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 4 of 8
84.9 85.8 5000 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1791
INPUT
Description: Maple between Meldrum and Sherwood
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4989.1 7.8 4989 13.8 4988.7 13.9 4988.2 42.5 4988.9
68.7 4988 70 4987.9 70.1 4988.4 74.4 4989 107.1 4989.5
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 13.8 .016 70.1 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
13.8 70.1 193 193 193 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 4999 F
84.4 107.1 4999 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1598
INPUT
Description: West of Maple and Meldrum intersection
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4989.1 18.3 4989 27.3 4988 27.4 4987.5 32.2 4988
57.6 4988.2 78 4988 86.3 4987.3 86.4 4987.8 87.5 4988
125.7 4989 149.1 4989.5
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 27.3 .016 87.5 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
27.3 87.5 117 117 117 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 13.3 4999 F
105.7 149.1 4999 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1481
INPUT
Description: Immediately east of Meldrum on Maple
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4987.6 69.5 4987 73.8 4987 73.9 4986.5 76.6 4987
101.5 4987.4 125.8 4987 130.8 4986.4 130.9 4986.9 133.2 4987
318.3 4988
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 5 of 8
0 .06 73.8 .016 130.9 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
73.8 130.9 108 108 108 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 62.7 4997 F
153.2 318.3 4997 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1373
INPUT
Description: Cross Section 1373
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4987 20 4986 20 4985.5 50 4986.75 77 4986
81 4985.8 81 4986.3 90 4987 130 4987.4
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 20 .016 81 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
20 81 92 92 92 .1 .3
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4990 130 130 4990
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1281
INPUT
Description: Cross Section 1281
Station Elevation Data num= 11
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986.2 120 4986 140 4985.5 150 4986 172 4986.32
182 4986 200 4985.14 200 4985.89 205 4986 260 4986.6
276 4986.72
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 140 .016 200 .045
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
140 200 168 168 168 .1 .3
Blocked Obstructions num= 1
Sta L Sta R Elev
0 120 4990
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1113
INPUT
Description: Cross Section 1113
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 25 4985.5 40 4985 40 4984.5 53 4985
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 6 of 8
75 4985.35 86 4985 105 4984.25 105 4985 136 4985.64
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 40 .016 105 .045
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
40 105 95 95 95 .1 .3
Blocked Obstructions num= 1
Sta L Sta R Elev
0 25 4990
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1018
INPUT
Description: Cross Section 1018
Station Elevation Data num= 6
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4985 37 4985.1 76 4985 94 4984.9 122 4984.85
255 4984.6
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .016 0 .016 255 .016
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
0 255 80 80 80 .1 .3
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 938
INPUT
Description: Cross Section 938
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4984.25 6 4984 20 4983 33 4983 52 4983.83
77 4983 82 4983 90 4983.63 239 4984
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 20 .016 82 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
20 82 155 155 155 .1 .3
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4990 90 239 4990
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 783
INPUT
Description: Cross Section 783
Station Elevation Data num= 8
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4984 8 4984 20 4983.13 20 4982.63 51 4983.25
77 4982.73 77 4983.23 90 4983.5
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 7 of 8
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 20 .016 77 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
20 77 0 0 0 .1 .3
Right Levee Station= 77 Elevation= 4983.22
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4990 90 90 4990
SUMMARY OF MANNING'S N VALUES
River:Maple
Reach River Sta. n1 n2 n3
Howes to Whit. 2458 .06 .016 .06
Howes to Whit. 2250 .06 .016 .06
Howes to Whit. 2103 .06 .016 .06
Howes to Whit. 1977 .06 .016 .06
Howes to Whit. 1791 .06 .016 .06
Howes to Whit. 1598 .06 .016 .06
Howes to Whit. 1481 .06 .016 .06
Howes to Whit. 1373 .04 .016 .06
Howes to Whit. 1281 .04 .016 .045
Howes to Whit. 1113 .04 .016 .045
Howes to Whit. 1018 .016 .016 .016
Howes to Whit. 938 .04 .016 .04
Howes to Whit. 783 .04 .016 .04
SUMMARY OF REACH LENGTHS
River: Maple
Reach River Sta. Left Channel Right
Howes to Whit. 2458 208 208 208
Howes to Whit. 2250 147 147 147
Howes to Whit. 2103 126 126 126
Howes to Whit. 1977 186 186 186
Howes to Whit. 1791 193 193 193
Howes to Whit. 1598 117 117 117
Howes to Whit. 1481 108 108 108
Howes to Whit. 1373 92 92 92
Howes to Whit. 1281 168 168 168
Howes to Whit. 1113 95 95 95
Howes to Whit. 1018 80 80 80
Howes to Whit. 938 155 155 155
Howes to Whit. 783 0 0 0
SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS
River: Maple
Reach River Sta. Contr. Expan.
Howes to Whit. 2458 .1 .3
PROJECT: 574-007
MAPLE STREET HYDRAULICS; DUPLICATE EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 8 of 8
Howes to Whit. 2250 .1 .3
Howes to Whit. 2103 .1 .3
Howes to Whit. 1977 .1 .3
Howes to Whit. 1791 .1 .3
Howes to Whit. 1598 .1 .3
Howes to Whit. 1481 .1 .3
Howes to Whit. 1373 .1 .3
Howes to Whit. 1281 .1 .3
Howes to Whit. 1113 .1 .3
Howes to Whit. 1018 .1 .3
Howes to Whit. 938 .1 .3
Howes to Whit. 783 .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. 2458 100-YR 172.00 4990.90 4992.28 4992.29
4992.57 0.004696 4.50 49.40 122.68 1.02
Howes to Whit. 2250 100-YR 172.00 4990.10 4991.20 4991.19
4991.47 0.003835 4.28 49.38 178.50 0.94
Howes to Whit. 2103 100-YR 172.00 4989.50 4990.73 4990.66
4990.96 0.003029 3.98 56.62 124.70 0.84
Howes to Whit. 1977 100-YR 234.00 4988.60 4990.14 4990.14
4990.49 0.004359 5.01 61.65 85.80 1.02
Howes to Whit. 1791 100-YR 234.00 4987.90 4989.42 4989.31
4989.70 0.002375 4.28 65.43 101.99 0.78
Howes to Whit. 1598 100-YR 234.00 4987.30 4988.77 4988.77
4989.11 0.003994 4.85 58.07 96.36 0.98
Howes to Whit. 1481 100-YR 116.00 4986.40 4987.43 4987.54
4987.81 0.018053 5.48 30.03 192.71 1.78
Howes to Whit. 1373 100-YR 116.00 4985.50 4986.72 4986.68
4986.91 0.003641 3.57 37.08 79.34 0.87
Howes to Whit. 1281 100-YR 116.00 4985.14 4986.30 4986.29
4986.49 0.006027 3.87 40.18 110.76 1.08
Howes to Whit. 1113 100-YR 116.00 4984.25 4985.39 4985.39
4985.60 0.004647 3.72 35.83 95.52 0.97
Howes to Whit. 1018 100-YR 27.00 4984.60 4984.82 4984.83
4984.89 0.009314 2.07 13.07 117.93 1.09
Howes to Whit. 938 100-YR 27.00 4983.00 4983.53 4983.34
4983.56 0.000995 1.50 20.52 59.96 0.44
Howes to Whit. 783 100-YR 32.00 4982.63 4983.15 4983.15
4983.28 0.006320 2.81 11.38 47.77 1.01
APPENDIX C.3
Hydraulic Modeling Output – Corrected Effective Model
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 1 of 9
HEC-RAS HEC-RAS 5.0.1 April 2016
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: Maple Street Hydraulics
Project File : MapleCE.prj
Run Date and Time: 7/26/2016 2:01:34 PM
Project in English units
PLAN DATA
Plan Title: CE
Plan File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\CE\MapleCE.p01
Geometry Title: Maple-CE
Geometry File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\CE\MapleCE.g01
Flow Title : Maple - 2-, 10-, and 100-YR Flows (no splits)
Flow File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\CE\MapleCE.f02
Plan Summary Information:
Number of: Cross Sections = 13 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
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: Maple - 2-, 10-, and 100-YR Flows (no splits)
Flow File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\CE\MapleCE.f02
Flow Data (cfs)
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 2 of 9
River Reach RS 2-YR 10-YR 100-YR
Maple Howes to Whit. 2458 29 60 172
Maple Howes to Whit. 1977 39 83 234
Maple Howes to Whit. 1481 2 18 116
Maple Howes to Whit. 1018 1 1 27
Maple Howes to Whit. 783 7 13 32
Boundary Conditions
River Reach Profile Upstream
Downstream
Maple Howes to Whit. 2-YR Normal S = 0.0047
Critical
Maple Howes to Whit. 10-YR Normal S = 0.0047
Critical
Maple Howes to Whit. 100-YR Normal S = 0.0047 Known WS =
4982.38
GEOMETRY DATA
Geometry Title: Maple-CE
Geometry File : d:\Projects\574-007\Drainage\Modeling\HEC-RAS\NEmod\CE\MapleCE.g01
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 2458
INPUT
Description: East of Maple and Whitcomb intersection
Station Elevation Data num= 14
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4993.1 3.4 4993 14.8 4992 34.7 4991.4 34.8 4990.9
37.5 4991 58.4 4992 64.9 4992.3 73.1 4992 92.8 4991.3
92.9 4991.8 100.8 4992 125.8 4992.2 215.8 4993
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 34.7 .016 92.9 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
34.7 92.9 208 208 208 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 19.4 5002 F
108 215.8 5002 F
Blocked Obstructions num= 1
Sta L Sta R Elev
147.2 199.9 5002
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 2250
INPUT
Description: Maple between Sherwood and Whitcomb
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4992 110.3 4991 243.9 4990.8 274.7 4990.8 274.8 4990.3
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 3 of 9
303.8 4990.9 333.2 4990.1 333.3 4990.6 341.1 4991 374.5 4991
485.2 4991 668.2 4992
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 274.7 .016 333.3 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
274.7 333.3 147 147 147 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 259 5001 F
350 668.2 5001 F
Blocked Obstructions num= 3
Sta L Sta R Elev Sta L Sta R Elev Sta L Sta R Elev
68.2 151.7 5001 200.6 244.5 5001 374.1 601 5001
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 2103
INPUT
Description: West of Maple and Sherwood intersection
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4991 71.8 4990.4 105.8 4990.4 105.9 4989.9 115.1 4990
130.5 4990.4 146.3 4990 161.8 4989.5 161.9 4990 169.5 4990
194.3 4990.5 236.1 4991
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 105.8 .016 161.9 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
105.8 161.9 126 126 126 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 87.7 5000 F
178.7 236.1 5000 F
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
13.9 70.2 5000 194.9 222.5 5000
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1977
INPUT
Description: East of Maple and Sherwood intersection
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4989.4 14.6 4989.4 14.7 4988.9 16.3 4989 40.5 4989.9
66.9 4989 70.3 4988.6 70.4 4989.1 85.8 4990
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 14.6 .016 70.4 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
14.6 70.4 186 186 186 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 5000 F
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 4 of 9
84.9 85.8 5000 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1791
INPUT
Description: Maple between Meldrum and Sherwood
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4989.1 7.8 4989 13.8 4988.7 13.9 4988.2 42.5 4988.9
68.7 4988 70 4987.9 70.1 4988.4 74.4 4989 107.1 4989.5
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 13.8 .016 70.1 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
13.8 70.1 193 193 193 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 0 4999 F
84.4 107.1 4999 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1598
INPUT
Description: West of Maple and Meldrum intersection
Station Elevation Data num= 12
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4989.1 18.3 4989 27.3 4988 27.4 4987.5 32.2 4988
57.6 4988.2 78 4988 86.3 4987.3 86.4 4987.8 87.5 4988
125.7 4989 149.1 4989.5
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 27.3 .016 87.5 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
27.3 87.5 117 117 117 .1 .3
Ineffective Flow num= 2
Sta L Sta R Elev Permanent
0 13.3 4999 F
105.7 149.1 4999 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1481
INPUT
Description: Immediately east of Meldrum on Maple
Station Elevation Data num= 45
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4987.36 3.68 4987.34 4.44 4987.29 12.31 4987.1 12.56 4987.12
22.14 4987.12 22.42 4987.14 30.68 4987.23 31.26 4987.27 33.49 4987.37
56.66 4987.21 58.53 4987.09 62.72 4986.98 63.64 4986.97 66.24 4986.96
66.84 4986.95 68.1 4986.97 73.65 4986.72 73.67 4986.72 73.86 4986.57
74.23 4986.58 74.64 4986.64 75.96 4986.78 80.92 4986.88 102.21 4987.29
103.11 4987.3 110.62 4987.24 117.45 4987.16 129.94 4986.77 131.86 4986.71
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 5 of 9
132.38 4986.71 133.25 4986.65 133.26 4986.65 133.88 4986.62 134.05 4986.74
134.37 4986.79 135.64 4986.89 135.87 4986.87 136.1 4986.87 136.99 4986.86
144.48 4987.34 148.9 4987.34 190.58 4987.52 217.12 4987.63 232.62 4987.62
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .06 73.65 .016 134.37 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
73.65 134.37 108 108 108 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
0 64 4988.83 T
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1373
INPUT
Description: Cross Section 1373
Station Elevation Data num= 63
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986.44 .78 4986.39 1.21 4986.37 5.74 4986.36 8.18 4986.44
8.81 4986.53 8.9 4986.83 8.97 4986.96 9.25 4986.94 9.36 4986.7
10.15 4986.64 10.54 4986.7 12.48 4986.85 13.13 4986.87 13.93 4986.86
14.25 4986.45 14.36 4986.43 16.47 4986.42 18.44 4986.24 21.48 4986.08
21.49 4986.08 21.49 4986.09 21.5 4986.09 23.2 4986.01 23.87 4985.97
23.88 4985.95 24.49 4985.88 24.58 4985.88 24.85 4985.91 26.37 4986.01
29.29 4986.15 29.63 4986.2 29.99 4986.25 42.33 4986.48 51.52 4986.46
63.96 4986.43 74.71 4986.1 82.2 4985.78 83.41 4985.73 84.14 4985.68
84.35 4985.84 84.68 4986.07 88.62 4986.23 91.52 4986.35 95.61 4986.47
99.03 4986.62 99.69 4986.63 99.95 4986.66 101.67 4986.7 105.65 4986.82
120.48 4987.54 125.29 4987.68 126.53 4987.72 126.63 4988.13 129.57 4987.55
140.17 4987.48 141.29 4987.85 145.97 4987.72 152.82 4987.36 157.45 4987.41
158.21 4987.4 160.71 4987.32 182.21 4987.2
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 21.48 .016 84.68 .06
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
21.48 84.68 92 92 92 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
0 13.8 4988.83 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1281
INPUT
Description: Cross Section 1281
Station Elevation Data num= 55
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986.08 23.05 4986.02 23.62 4986.02 35.05 4985.94 36.37 4985.94
73.36 4985.85 74.5 4985.85 75.08 4985.84 99.66 4985.71 101.95 4985.71
126.47 4985.57 128.39 4985.58 131.96 4985.52 135.16 4985.47 139.67 4985.46
140.22 4985.44 140.43 4985.48 140.45 4985.45 141.24 4985.44 143.66 4985.28
145.03 4985.4 145.36 4985.43 147.83 4985.5 155.11 4985.67 169.25 4986.02
170.92 4986.01 181.39 4985.96 185.44 4985.94 188.93 4985.81 200.79 4985.19
201.56 4985.15 203.09 4985.14 203.49 4985.73 203.63 4985.96 205.2 4986.08
205.29 4985.95 212.43 4986.13 214.37 4986.1 217.79 4986.23 219.28 4986.26
219.73 4986.22 221.09 4986.19 226.46 4986.15 227.12 4985.83 227.37 4985.7
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 6 of 9
228.78 4985.63 228.81 4985.66 229.15 4985.89 230.06 4985.95 242.16 4986
248.05 4986.02 255.29 4986.04 274.33 4986.08 279.72 4986.14 300.82 4986.37
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 141.24 .016 203.63 .045
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
141.24 203.63 168 168 168 .1 .3
Ineffective Flow num= 1
Sta L Sta R Elev Permanent
0 133.4 4986.83 F
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1113
INPUT
Description: Cross Section 1113
Station Elevation Data num= 10
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4986 25 4985.5 40 4985 40 4984.5 53 4985
75 4985.35 86 4985 105 4984.25 105 4985 136 4985.64
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 40 .016 105 .045
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
40 105 95 95 95 .1 .3
Blocked Obstructions num= 1
Sta L Sta R Elev
0 25 4990
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 1018
INPUT
Description: Cross Section 1018
Station Elevation Data num= 6
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4985 37 4985.1 76 4985 94 4984.9 122 4984.85
255 4984.6
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .016 0 .016 255 .016
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
0 255 80 80 80 .1 .3
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 938
INPUT
Description: Cross Section 938
Station Elevation Data num= 9
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4984.25 6 4984 20 4983 33 4983 52 4983.83
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 7 of 9
77 4983 82 4983 90 4983.63 239 4984
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 20 .016 82 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
20 82 155 155 155 .1 .3
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4990 90 239 4990
CROSS SECTION
RIVER: Maple
REACH: Howes to Whit. RS: 783
INPUT
Description: Cross Section 783
Station Elevation Data num= 8
Sta Elev Sta Elev Sta Elev Sta Elev Sta Elev
0 4984 8 4984 20 4983.13 20 4982.63 51 4983.25
77 4982.73 77 4983.23 90 4983.5
Manning's n Values num= 3
Sta n Val Sta n Val Sta n Val
0 .04 20 .016 77 .04
Bank Sta: Left Right Lengths: Left Channel Right Coeff Contr. Expan.
20 77 0 0 0 .1 .3
Right Levee Station= 77 Elevation= 4983.22
Blocked Obstructions num= 2
Sta L Sta R Elev Sta L Sta R Elev
0 0 4990 90 90 4990
SUMMARY OF MANNING'S N VALUES
River:Maple
Reach River Sta. n1 n2 n3
Howes to Whit. 2458 .06 .016 .06
Howes to Whit. 2250 .06 .016 .06
Howes to Whit. 2103 .06 .016 .06
Howes to Whit. 1977 .06 .016 .06
Howes to Whit. 1791 .06 .016 .06
Howes to Whit. 1598 .06 .016 .06
Howes to Whit. 1481 .06 .016 .06
Howes to Whit. 1373 .04 .016 .06
Howes to Whit. 1281 .04 .016 .045
Howes to Whit. 1113 .04 .016 .045
Howes to Whit. 1018 .016 .016 .016
Howes to Whit. 938 .04 .016 .04
Howes to Whit. 783 .04 .016 .04
SUMMARY OF REACH LENGTHS
River: Maple
Reach River Sta. Left Channel Right
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 8 of 9
Howes to Whit. 2458 208 208 208
Howes to Whit. 2250 147 147 147
Howes to Whit. 2103 126 126 126
Howes to Whit. 1977 186 186 186
Howes to Whit. 1791 193 193 193
Howes to Whit. 1598 117 117 117
Howes to Whit. 1481 108 108 108
Howes to Whit. 1373 92 92 92
Howes to Whit. 1281 168 168 168
Howes to Whit. 1113 95 95 95
Howes to Whit. 1018 80 80 80
Howes to Whit. 938 155 155 155
Howes to Whit. 783 0 0 0
SUMMARY OF CONTRACTION AND EXPANSION COEFFICIENTS
River: Maple
Reach River Sta. Contr. Expan.
Howes to Whit. 2458 .1 .3
Howes to Whit. 2250 .1 .3
Howes to Whit. 2103 .1 .3
Howes to Whit. 1977 .1 .3
Howes to Whit. 1791 .1 .3
Howes to Whit. 1598 .1 .3
Howes to Whit. 1481 .1 .3
Howes to Whit. 1373 .1 .3
Howes to Whit. 1281 .1 .3
Howes to Whit. 1113 .1 .3
Howes to Whit. 1018 .1 .3
Howes to Whit. 938 .1 .3
Howes to Whit. 783 .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. 2458 100-YR 172.00 4990.90 4992.28 4992.29
4992.57 0.004696 4.50 49.40 122.68 1.02
Howes to Whit. 2250 100-YR 172.00 4990.10 4991.20 4991.19
4991.47 0.003835 4.28 49.38 178.50 0.94
Howes to Whit. 2103 100-YR 172.00 4989.50 4990.73 4990.66
4990.96 0.003029 3.98 56.62 124.70 0.84
Howes to Whit. 1977 100-YR 234.00 4988.60 4990.14 4990.14
4990.49 0.004359 5.01 61.65 85.80 1.02
Howes to Whit. 1791 100-YR 234.00 4987.90 4989.42 4989.31
4989.70 0.002397 4.29 65.22 101.83 0.78
Howes to Whit. 1598 100-YR 234.00 4987.30 4988.77 4988.77
4989.11 0.003994 4.85 58.07 96.36 0.98
Howes to Whit. 1481 100-YR 116.00 4986.57 4987.34 4987.48
4987.78 0.018575 5.66 25.48 134.78 1.82
Howes to Whit. 1373 100-YR 116.00 4985.68 4986.71 4986.71
4986.92 0.005029 3.83 36.37 97.89 1.01
Howes to Whit. 1281 100-YR 116.00 4985.14 4986.17 4986.14
4986.34 0.004178 3.54 43.10 273.90 0.92
Howes to Whit. 1113 100-YR 116.00 4984.25 4985.39 4985.39
4985.60 0.004647 3.72 35.83 95.52 0.97
Howes to Whit. 1018 100-YR 27.00 4984.60 4984.82 4984.83
4984.89 0.009314 2.07 13.07 117.93 1.09
PROJECT: 574-007
MAPLE STREET HYDRAULICS; CORRECTED EFFECTIVE MODEL
NORTHERN ENGINEERING; JULY 2016
Page 9 of 9
Howes to Whit. 938 100-YR 27.00 4983.00 4983.53 4983.34
4983.56 0.000995 1.50 20.52 59.96 0.44
Howes to Whit. 783 100-YR 32.00 4982.63 4983.15 4983.15
4983.28 0.006320 2.81 11.38 47.77 1.01
/ / / / / / / / /
/
/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /
/
/ / / / /
/ /
/
/
/
/ /
/
/
/ /
/
/ /
/
/ /
/
/ /
/
/
/
/ / / / /
/
/ / / / / / /
/
/
/
/
/
/
/
/ / /
/
/
/
/
/
/ / / / /
/ / / / / / / / / / / / / / / / /
/
/ / / / / / / /
/ /
/
/
/ / / / / / /
/
/ / /
/ /
/
/ /
/ / /
/
/
/ / / / / / /
/
/
/
/ / / /
/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /
/ / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / / /
/
/
/ / / / / / / /
/ /
/
/ /
/
/ /
/ / /
/
/ /
/ /
/
/
/ / / / /
/
/ /
/
/ / / / /
/
/ /
/ /
/ /
/ /
/ /
/
/
/
/
/ / / /
/ /
/ / / / / / / / / / / / / / / / / /
/ / / / / / / /
/
/ / / / / / / / / / / / /
/
/
/
/ / / / / / / / /
/
/
/ /
/
/ / / / / /
/
/
/
/
/
/ /
/
/
/ / / / / /
/
/
/ /
/
/
/ /
/
/ /
/ /
/ / / / /
/
/
/
/ /
/
/
/ / / / /
/
/
/ /
/
/
/ /
/
/ / / /
/
/
/ /
/ / / / / / /
/
/
/ / / /
/
/ /
/
/
/
/ /
/
/ /
/ /
/
/
/
/
/ / / /
/
/
/
/
/
/ /
/
/
/
/
/ / /
/ / / / / / / / /
/ /
/ / / / / / / / / / / / / / / / /
/ / /
/
/
/
/
/
/
/ / / /
/ / / / / /
/
/ / / /
/
/
/
/ / / / /
/
/ /
/
/
/
/ /
/ / /
/
/
/ / /
/
/ / / / / / / / / /
/
/
/
/
/
/ / / / / / / / / / / /
/
/
/
/
/
/
/ / /
/ /
/
/
/ /
/
/
/
/ /
/
/
/ /
/ / / / / / / /
/
/ /
/
/ / / / / / /
/
/
/
/
/ / /
/
/
/ / /
/
/
/
/
/
/
/
/
/ /
/
/ / /
/
/
/
/ /
/
/
/
/
/
/
/
/ / /
/
/
/
/ / /
/
/
/
/
/
/
/
/
/ / / /
/
/ / /
/
/ /
/
/ / /
/ / / / / / / / /
/
/ / / / /
/ / / / / / / / / / /
/ / /
/
/ / /
/ / /
/ /
/
/ / /
/
/
/ / / / / / / /
/
/
/
/ /
T
T
VAULT
ELEC
FO
VAULT
ELEC
CONTROL
IRR
C
VAULT
ELEC
E E
G G G G
G
CTV
CTV
CTV
CTV
CTV
E
E
E
E
E
E
E
G G
G
G G G G
G
G
G
E
E
E
E E E E E E
E
E
E
E
CTV
CTV
CTV CTV
CTV
CTV
CTV CTV CTV CTV
CTV
SS
SS SS SS SS SS SS SS
SS SS SS SS SS SS SS SS SS
ST
ST
ST ST ST ST
ST ST ST ST ST ST
ST
ST ST ST ST ST ST
SS
SS
SS SS
SS SS SS SS
SS
SS
SS
SS
SS
TF
4991.18
1598
4992.18
4990.18
4989.18
FFE=91.00
FFE=91.00
FFE=91.00
FFE=91.00
FFE=91.00
BIKE PARKING
STAIRWELL
STAIRWELL
FFE=91.00
FFE=91.00
TRASH/
RECYCLING
TRANSFORMER
EXISTING 100-YR CITY
REGULATED FLOODWAY
(OLD TOWN)
EXISTING 100-YR CITY
REGULATED FLOODWAY
(OLD TOWN)
CURRENT EFFECTIVE 100-YR CITY
REGULATED FLOODPLAIN
BOUNDARY (OLD TOWN)
STAIRWELL
SD SD SD SD SD SD SD
SD SD SD SD SD SD SD
SD SD
5' SIDEWALK
5' SIDEWALK
MAPLE STREET
(100' ROW)
MELDRUM STREET
(100' ROW)
ALLEY
(EXISTING 20' ROW)
JAMES E. & CAROL S. BURRILL
305 MAPLE STREET
JESS L & DICK L. GRIES
312 N. MELDRUM STREET
WASHINGTON PARK, LLC
301 N. HOWES STREET
WASHINGTON PARK, LLC
301 N. HOWES STREET
WASHINGTON PARK, LLC
301 N. HOWES STREET
CITY OF FORT COLLINS
300 LAPORTE AVENUE
CORRECTED EFFECTIVE
100-YR CITY
REGULATED FLOODPLAIN
BOUNDARY (OLD TOWN)
CURRENT EFFECTIVE 100-YR CITY
REGULATED FLOODPLAIN
BOUNDARY (OLD TOWN)
CURRENT EFFECTIVE 100-YR CITY
REGULATED FLOODPLAIN
BOUNDARY (OLD TOWN)
1281
1373
1481
Sheet
MAPLE MIXED USE These drawings are
instruments of service
provided by Northern
Engineering Services, Inc.
and are not to be used for
any type of construction
unless signed and sealed by
a Professional Engineer in
the employ of Northern
Engineering Services, Inc.
NOT FOR CONSTRUCTION
REVIEW SET
301 North Howes Street, Suite 100
Fort Collins, Colorado 80521
ENGINEER ING
N O R T H E RN
PHONE: 970.221.4158
www.northernengineering.com
FLOOD
MODELING WORKMAP
FLOODPLAIN EXHIBIT/FLOOD
LEGEND:
PROPOSED CONTOUR
EXISTING STORM SEWER
PROPOSED STORM SEWER
ST
PROPOSED SWALE
EXISTING CONTOUR
PROPOSED CURB & GUTTER
EXISTING 100-YEAR CITY FLOODWAY
PROPOSED STORM INLET
PROPOSED CONCRETE
CROSS PAN (TYP.)
PEDESTRIAN ACCESS RAMPS
/ / / / / / / / / / / / / / / / / / / / / / / / / / /
PROPERTY BOUNDARY
CROSS-SECTION (CSL)
EXISTING 100-YEAR CITY FLOODPLAIN
XS#: 2446
( IN FEET )
0
1 INCH = 20 FEET
20 20 40 60
NORTH
NOTES:
FOR STORMWATER REVIEW ONLY
NOT FOR CONSTRUCTION
1. REFER TO THE PLAT FOR LOT AREAS, TRACT SIZES, EASEMENTS, LOT DIMENSIONS,
UTILITY EASEMENTS, OTHER EASEMENTS, AND OTHER SURVEY INFORMATION
2. THIS PROJECT IS LOCATED WITHIN A CITY-REGULATED OLD TOWN 100-YEAR
FLOODWAY AND FLOOD FRINGE AND MUST COMPLY WITH CHAPTER 10 OF THE CITY
CODE.
3. ALL ELEVATIONS DEPICTED IN PLAN VIEW AND BENCHMARKS LISTED HEREON ARE
PER THE CITY OF FORT COLLINS VERTICAL CONTROL DATUM (NAVD 88).
4. ANY ITEMS LOCATED IN THE FLOODWAY THAT CAN FLOAT (E.G., PICNIC TABLES,
BIKE RACKS, ETC.) MUST BE ANCHORED.
5. THE LOWEST FLOOR AND THE FINISHED FLOOR FOR ANY BUILDING IN THE
FLOODPLAIN SHALL BE CONSTRUCTED ABOVE THE REGULATORY FLOOD
PROTECTION ELEVATION OR BELOW THE REGULATORY FLOOD PROTECTION
ELEVATION.
6. A FLOODPLAIN USE PERMIT SHALL BE REQUIRED FOR EACH STRUCTURE AND EACH
SITE CONSTRUCTION ELEMENT IN THE FLOODPLAIN.
7. THE FLOODPLAIN USE PERMIT FOR THE BUILDING WILL BE SUBMITTED AT THE TIME
OF THE BUILDING PERMIT APPLICATION.
8. A FLOODPROOFING CERTIFICATE SHALL BE COMPLETED AND APPROVED BEFORE
THE CERTIFICATE OF OCCUPANCY IS ISSUED FOR ANY STRUCTURE IN THE
FLOODPLAIN.
9. THE FLOODPROOFING REQUIREMENTS OF CHAPTER 10 OF THE CITY CODE WILL BE
SATISFIED PRIOR TO ISSUANCE OF A BUILDING PERMIT.
10. NO STORAGE OF MATERIALS OR EQUIPMENT SHALL BE ALLOWED IN THE
FLOODWAY, WHETHER TEMPORARY (DURING CONSTRUCTION) OR PERMANENT.
LANDSCAPING SHALL ALSO MEET THE REQUIREMENTS FOR NO RISE IN THE
FLOODWAY.
11. REFER TO THE DRAINAGE REPORT FOR MAPLE MIXED USE DATED AUGUST 3, 2016
FOR ADDITIONAL INFORMATION.
12. A FLOODPLAIN USE PERMIT AND NO RISE CERTIFICATION IS REQUIRED PRIOR TO
PERFORMING ANY WORK WITHIN THE FLOODWAY (I.E., CURB CUT REMOVAL,
LANDSCAPING).
13. ALL HVAC EQUIPMENT IS TO BE LOCATED ON THE ROOFTOP OF THE STRUCTURE.
FIELD SURVEY BY:
BENCHMARKS:
Northern Engineering Services, Inc.
Project No. 574-007
Date: September 2015
BENCHMARK #1:
City of Fort Collins Benchmark 10-00
Elevation= 4991.61
BENCHMARK #2:
City of Fort Collins Benchmark 36-97
Elevation= 5064.31
Please Note: This plan set is using NAVD88 for a vertical datum. Surrounding developments have
used NGVD29 Unadjusted for their vertical datums.
If NGVD29 Unadjusted datum is required for any purpose, the following equation should be used:
NGVD29 Unadjusted = NAVD88 - 3.18'.
DETAIL
MIXED-USE BUILDING
SUMMARY
EL. DESIGNATION NAVD 88
A 4990.42 FT
B 4991.92 FT
C 4992.00 FT
REGULATORY FLOOD
PROTECTION
ELEVATION (RFPE)
4991.92 FT
MINIMUM
FLOODPROOFING
ELEVATION
4991.92 FT
ELEVATION OF HVAC
EQUIPMENT ROOFTOP
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
Know what'sbelow.
Call before you dig.
R
FEMA BASE FLOOD ELEVATION (BFE)
ELEVATION NAVD 88 5003
ELEVATION NGVD 29
(FORT COLLINS-UNADJUSTED)
Duplicate Effective (DE) Corrected Effective (CE) Difference
River Sta W.S. Elev W.S. Elev W.S. Elev
(ft) (ft) (ft)
1281 4986.3 4986.17 -0.13
1373 4986.72 4986.71 -0.01
1481 4987.43 4987.34 -0.09
1598 4988.77 4988.77 0.00