HomeMy WebLinkAboutBUENO DRIVE CONDOS - PDP190004 - SUBMITTAL DOCUMENTS - ROUND 3 - DRAINAGE REPORTDesign Point Basins Area (ac) %Imp C2
C100 Q
2 (cfs) Q100
(cfs)
1 E1 0.934 47.1% 0.52 0.65 1.08 4.75
2 E2 0.032 1.8% 0.14 0.17 0.01 0.04
Existing Condition Hydrology Summary Table
5724 Bueno Drive
Fort Collins, CO
11:28 AM
5/22/2019
Design Point Basins Area (ac) %Imp C2
C100 Q
2 (cfs) Q100
(cfs)
1 S1 0.125 91.4% 0.91 1.00 0.32 1.25
2 S2 0.043 90.0% 0.95 1.00 0.12 0.43
3 S3 0.053 90.0% 0.95 1.00 0.14 0.53
4 S4 0.152 22.2% 0.33 0.41 0.13 0.58
Site S1,S2,S3,S4 0.373 63.0% 0.68 0.76 0.72 2.79
Proposed Condition Hydrology Summary Table
5724 Bueno Drive
Fort Collins, CO
11:28 AM
5/22/2019
Basin
No.
Total Area
(ft2)
Total
Area (ac.)
Paved Area
(ft2)
C = 0.95
100% IMP
Roof
(ft2)
C = 0.95
90% IMP
Lawns, Sandy Soil,
Avg Slope 2-7%
Area (ft2)
C = 0.15
2% IMP Composite C Composite C100
Percent
Impervious (%)
Net Impervious
Area (ft2)
Cummulative
Impervious Area (ft2)
Cummulative Site
%IMP
E1 40,693 0.934 16,915 2,041 21,737 0.52 0.65 47.1% 19,187 19,187 99.9%
S2 1,400 0.032 0 0 1,263 0.14 0.17 1.8% 25 19,212 100%
Site 42,093 0.966 0.51 0.64 45.6% 19,212
Runoff Coefficents and Site Percent Imperviousness Calculations
5724 Bueno Drive
Fort Collins, CO
Existing Conditions
11:31 AM
5/22/2019
Basin
No.
Total Area
(ft2)
Total
Area (ac.)
Paved
Area
(ft2)
C = 0.95
100% IMP
Roof
(ft2)
C = 0.95
90% IMP
Lawns, Sandy Soil,
Avg Slope 2-7%
Area (ft2)
C = 0.15
2% IMP Composite C Composite C100
Percent
Impervious (%)
Net Impervious
Area (ft2)
Cummulative
Impervious Area (ft2)
Cummulative Site
%IMP
S1 5,454 0.125 4,267 790 397 0.89 1.00 91.4% 4,986 4,986 49%
S2 1,877 0.043 0 1,877 0 0.95 1.00 90.0% 1,689 6,675 65%
S3 2,325 0.053 0 2,325 0 0.95 1.00 90.0% 2,093 8,768 86%
S4 6,601 0.152 442 1,025 5,134 0.33 0.41 22.2% 1,467 10,235 100%
Site 16,257 0.373 0.68 0.85 63.0% 10,235
Runoff Coefficents and Site Percent Imperviousness Calculations
5724 Bueno Drive
Fort Collins, CO
Proposed Conditions
11:35 AM
5/22/2019
Channel
Flow
Pipe
Flow Notes
Design Basins Area C*
Cf
(2yr)
Cf
(100yr) C2
C100 LS
ti
(2yr)
ti
(100yr) LSVt
L tL
tL
Computed
Tc
Max
Tc
Final
Tc
Computed
Tc
Max
Tc
Final
Tc i
2 i100
Q2 Q
100 Minor Major
Point (ac) (ft) (%) (min) (min) (ft) (ft/ft) (ft/s) (min) (min) (min) (min) (min) (min) (min) (min) (min) in/hr in/hr (cfs) (cfs) (cfs) (cfs)
1 E1 0.934 0.52 1.0 1.25 0.52 0.65 145 1.7 10.9 8.4 0 0.000 0.0 0.0 1.4 0.0 12.3 10.1 10.1 9.8 10.1 9.8 2.20 7.78 1.08 4.75
2 E2 0.032 0.14 1.0 1.25 0.14 0.17 109 2.8 13.4 12.9 0 0.000 0.0 0.0 0.0 0.0 13.4 10.1 10.1 12.9 10.1 10.1 2.20 7.70 0.01 0.04
* Weighted-area average method used to calculate composite C for design points that have multiple tributary basins.
Design
Lt
S
Rt
SW Slope "n" Y L V t
L
Lt
S
Rt
S WS"n"Y L V t
L Dia "n" S L V
Point (ft/ft) (ft/ft) (ft) (ft/ft) (ft) (ft) (ft/s) (min) (ft/ft) (ft/ft) (ft) (ft/ft) (ft) (ft) (ft/s) (min) (ft) (ft/ft) (ft) (ft/s)
1 10.0 10.0 0.0 0.044 0.035 0.23 174 2.09 1.4 n/a n/a n/a n/a n/a n/a n/a 0.00 0.00 n/a n/a n/a n/a 0.0
2 n/a n/a n/a n/a n/a n/a n/a 0.00 0.00 n/a n/a n/a n/a n/a n/a n/a 0.00 0.00 n/a n/a n/a n/a 0.0
Rational Method
Existing Conditions
5724 Bueno Drive
Sub-Basin Data Initial Overland Time Gutter Flow Tc 2yr T
c 100yr Intensity Runoff
Street
Capacity
Swale Pan Pipe
Fort Collins, CO
Travel Time Parameters
11:35 AM
Channel
Flow
Pipe
Flow Notes
Design Basins Area C*
Cf
(2yr)
Cf
(100yr) C2 C100 LS
ti
(2yr)
ti
(100yr) LSVtL tL tL
Computed
Tc
Max
Tc
Final
Tc
Computed
Tc
Max
Tc
Final
Tc i2 i100 Q2 Q100 Minor Major
Point (ac) (ft) (min) (min) (ft) (ft/ft) (ft/s) (min) (min) (min) (min) (min) (min) (min) (min) (min) in/hr in/hr (cfs) (cfs) (cfs) (cfs)
1 S1 0.125 0.91 1.0 1.25 0.91 1.00 44.9 2.9 1.7 0.9 0 0.000 0.0 0.0 0.8 0.0 2.5 10.2 5.0 1.7 10.2 5.0 2.85 9.95 0.32 1.25
2 S2 0.043 0.95 1.0 1.25 0.95 1.00 22.4 8.0 0.7 0.4 0 0.000 0.0 0.0 0.0 0.0 0.7 10.1 5.0 0.4 10.1 5.0 2.85 9.95 0.12 0.43
3 S3 0.053 0.95 1.0 1.25 0.95 1.00 23.3 8.0 0.7 0.5 0 0.000 0.0 0.0 0.0 0.0 0.7 10.1 5.0 0.5 10.1 5.0 2.85 9.95 0.14 0.53
4 S4 0.152 0.33 1.0 1.25 0.33 0.41 17 20.0 2.2 2.0 0 0.000 0.0 2.0 2.0 0.0 6.2 10.1 6.2 6.0 10.1 6.0 2.64 9.33 0.13 0.58
* Weighted-area average method used to calculate composite C for design points that have multiple tributary basins.
Design
Lt
S
Rt
SW Slope "n" Y L V tL
Lt
S
Rt
S WS"n"Y LV tL Dia "n" S L V tL
Point (ft/ft) (ft/ft) (ft) (ft/ft) (ft) (ft) (ft/s) (min) (ft/ft) (ft/ft) (ft) (ft/ft) (ft) (ft) (ft/s) (min) (ft) (ft/ft) (ft) (ft/s) (min)
1 n/a n/a n/a n/a n/a n/a n/a 0.00 0.0 8.0 8.0 0.0 0.005 0.013 0.13 60 1.27 0.8 n/a n/a n/a n/a 0.0 0.0
2 n/a n/a n/a n/a n/a n/a n/a 0.00 0.0 n/a n/a n/a n/a n/a n/a n/a 0.00 0.0 n/a n/a n/a n/a 0.0 0.0
3 n/a n/a n/a n/a n/a n/a n/a 0.00 0.0 n/a n/a n/a n/a n/a n/a n/a 0.00 0.0 n/a n/a n/a n/a 0.0 0.0
4 10.0 10.0 0.0 0.031 0.060 0.13 86.5 0.72 2.0 8.0 8.0 0.0 0.005 0.013 0.13 86 1.24 1.2 n/a n/a n/a n/a 0.0 0.0
Swale Pan Pipe
Travel Time Parameters
Street
Capacity
Rational Method
Proposed Conditions
5724 Bueno Drive
Fort Collins, CO
Sub-Basin Data Initial Overland Time Gutter Flow Tc 2yr Tc 100yr Intensity Runoff
11:36 AM
5/22/2019
Hydrologic Soil Group—Larimer County Area, Colorado
(xx)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/29/2019
Page 1 of 4
4484071 4484078 4484085 4484092 4484099 4484106
4484071 4484078 4484085 4484092 4484099 4484106
493595 493602 493609 493616 493623 493630 493637 493644 493651 493658
493595 493602 493609 493616 493623 493630 493637 493644 493651 493658
40° 30' 27'' N
105° 4' 32'' W
40° 30' 27'' N
105° 4' 29'' W
40° 30' 26'' N
105° 4' 32'' W
40° 30' 26'' N
105° 4' 29'' W
N
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 10 20 40 60
Feet
0 4 8 16 24
Meters
Map Scale: 1:301 if printed on A landscape (11" x 8.5") sheet.
Soil Map may not be valid at this scale.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Lines
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Soil Rating Points
A
A/D
B
B/D
C
C/D
D
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Warning: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
Hydrologic Soil Group
Map unit symbol Map unit name Rating Acres in AOI Percent of AOI
54 Kim loam, 3 to 5 percent
slopes
B 0.0 0.9%
55 Kim loam, 5 to 9 percent
slopes
B 0.4 99.1%
Totals for Area of Interest 0.4 100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive
precipitation from long-duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when
thoroughly wet. These consist mainly of deep, well drained to excessively
drained sands or gravelly sands. These soils have a high rate of water
transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well
drained soils that have moderately fine texture to moderately coarse texture.
These soils have a moderate rate of water transmission.
Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of
water transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay
layer at or near the surface, and soils that are shallow over nearly impervious
material. These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, B/D, or C/D), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in
their natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Hydrologic Soil Group—Larimer County Area, Colorado xx
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/29/2019
Page 3 of 4
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Hydrologic Soil Group—Larimer County Area, Colorado xx
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/29/2019
Page 4 of 4
of the version date(s) listed below.
Soil Survey Area: Larimer County Area, Colorado
Survey Area Data: Version 13, Sep 10, 2018
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Sep 20, 2015—Oct
21, 2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Hydrologic Soil Group—Larimer County Area, Colorado
(xx)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
3/29/2019
Page 2 of 4
5/22/2019