HomeMy WebLinkAboutSUN COMMUNITIES - THE FOOTHILLS - PDP210001 - SUBMITTAL DOCUMENTS - ROUND 5 - DRAINAGE RELATED DOCUMENT (3)D
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THE FOOTHILLS
LINEAR BIORETENTION EXHIBIT
Project Name:The Foothills
Project Number:19002763
Project Location:Fort Collins
Linear Bioretention 1
Tributary Sub Basins are A1 - A7
Basin ID Area (AC) Percent Impervious
A1 3.73 35%
A2 2.95 33%
A3 4.09 51%
A4 2.38 55%
A5 2.49 61%
A6 2.15 51%
A7 2.78 51%
Average 20.57 47.2%
Sheet 1 of 2
Designer:
Company:
Date:
Project:
Location:
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, Ia Ia =47.3 %
(100% if all paved and roofed areas upstream of rain garden)
B) Tributary Area's Imperviousness Ratio (i = Ia/100)i = 0.473
C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time WQCV = 0.16 watershed inches
(WQCV= 0.8 * (0.91* i3 - 1.19 * i2 + 0.78 * i)
D) Contributing Watershed Area (including rain garden area) Area = 895,594 sq ft
E) Water Quality Capture Volume (WQCV) Design Volume VWQCV =cu ft
Vol = (WQCV / 12) * Area
F) For Watersheds Outside of the Denver Region, Depth of d6 =0.40 in
Average Runoff Producing Storm
G) For Watersheds Outside of the Denver Region, VWQCV OTHER =11,053 cu ft
Water Quality Capture Volume (WQCV) Design Volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume VWQCV USER =cu ft
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
A) WQCV Depth (12-inch maximum)DWQCV =12 in
B) Rain Garden Side Slopes (Z = 4 min., horiz. dist per unit vertical) Z = 4.00 ft / ft
(Use "0" if rain garden has vertical walls)
C) Mimimum Flat Surface Area AMin =8472 sq ft
D) Actual Flat Surface Area AActual =9164 sq ft
E) Area at Design Depth (Top Surface Area)ATop =14347 sq ft
F) Rain Garden Total Volume VT=11,756 cu ft
(VT= ((ATop + AActual) / 2) * Depth)
3. Growing Media
4. Underdrain System
A) Are underdrains provided?1
B) Underdrain system orifice diameter for 12 hour drain time
i) Distance From Lowest Elevation of the Storage y =3.1 ft
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours Vol12 =11,053 cu ft
iii) Orifice Diameter, 3/8" Minimum DO =2 3/16 in
Design Procedure Form: Rain Garden (RG)
SB
Atwell, LLC
July 9, 2021
The foothills
Fort Collins
UD-BMP (Version 3.07, March 2018)
Choose One
Choose One
18" Rain Garden Growing Media
Other (Explain):
YES
NO
UD-BMP_v3.07 RG1, RG 7/9/2021, 11:40 AM
Sheet 2 of 2
Designer:
Company:
Date:
Project:
Location:
5. Impermeable Geomembrane Liner and Geotextile Separator Fabric
A) Is an impermeable liner provided due to proximity
of structures or groundwater contamination?
6. Inlet / Outlet Control
A) Inlet Control
7. Vegetation
8. Irrigation
A) Will the rain garden be irrigated?
Notes:
Design Procedure Form: Rain Garden (RG)
SB
Atwell, LLC
July 9, 2021
The foothills
Fort Collins
Choose One
Choose One
Choose One
Sheet Flow- No Energy Dissipation Required
Concentrated Flow- Energy Dissipation Provided
Plantings
Seed (Plan for frequent weed control)
Sand Grown or Other High Infiltration Sod
Choose One
YES
NO
YES
NO
UD-BMP_v3.07 RG1, RG 7/9/2021, 11:40 AM
Project Name:The Foothills
Project Number:19002763
Project Location:Fort Collins
Linear Bioretention 2
Tributary Sub Basins are A8 - A11
Basin ID Area (AC) Percent Impervious
A8 4.20 52%
A9 1.82 42%
A10 4.50 41%
A11 0.40 50%
Average 10.92 45.7%
Sheet 1 of 2
Designer:
Company:
Date:
Project:
Location:
1. Basin Storage Volume
A) Effective Imperviousness of Tributary Area, Ia Ia =45.7 %
(100% if all paved and roofed areas upstream of rain garden)
B) Tributary Area's Imperviousness Ratio (i = Ia/100)i = 0.457
C) Water Quality Capture Volume (WQCV) for a 12-hour Drain Time WQCV = 0.16 watershed inches
(WQCV= 0.8 * (0.91* i3 - 1.19 * i2 + 0.78 * i)
D) Contributing Watershed Area (including rain garden area) Area = 475,675 sq ft
E) Water Quality Capture Volume (WQCV) Design Volume VWQCV =cu ft
Vol = (WQCV / 12) * Area
F) For Watersheds Outside of the Denver Region, Depth of d6 =0.40 in
Average Runoff Producing Storm
G) For Watersheds Outside of the Denver Region, VWQCV OTHER =5,746 cu ft
Water Quality Capture Volume (WQCV) Design Volume
H) User Input of Water Quality Capture Volume (WQCV) Design Volume VWQCV USER =cu ft
(Only if a different WQCV Design Volume is desired)
2. Basin Geometry
A) WQCV Depth (12-inch maximum)DWQCV =12 in
B) Rain Garden Side Slopes (Z = 4 min., horiz. dist per unit vertical) Z = 4.00 ft / ft
(Use "0" if rain garden has vertical walls)
C) Mimimum Flat Surface Area AMin =4348 sq ft
D) Actual Flat Surface Area AActual =4348 sq ft
E) Area at Design Depth (Top Surface Area)ATop =7497 sq ft
F) Rain Garden Total Volume VT=5,923 cu ft
(VT= ((ATop + AActual) / 2) * Depth)
3. Growing Media
4. Underdrain System
A) Are underdrains provided?1
B) Underdrain system orifice diameter for 12 hour drain time
i) Distance From Lowest Elevation of the Storage y =3.1 ft
Volume to the Center of the Orifice
ii) Volume to Drain in 12 Hours Vol12 =5,746 cu ft
iii) Orifice Diameter, 3/8" Minimum DO =1 5/8 in
Design Procedure Form: Rain Garden (RG)
SB
Atwell, LLC
July 15, 2021
The foothills
Fort Collins
UD-BMP (Version 3.07, March 2018)
Choose One
Choose One
18" Rain Garden Growing Media
Other (Explain):
YES
NO
UD-BMP_v3.07 RG2, RG 7/15/2021, 9:47 AM
Sheet 2 of 2
Designer:
Company:
Date:
Project:
Location:
5. Impermeable Geomembrane Liner and Geotextile Separator Fabric
A) Is an impermeable liner provided due to proximity
of structures or groundwater contamination?
6. Inlet / Outlet Control
A) Inlet Control
7. Vegetation
8. Irrigation
A) Will the rain garden be irrigated?
Notes:
Design Procedure Form: Rain Garden (RG)
SB
Atwell, LLC
July 15, 2021
The foothills
Fort Collins
Choose One
Choose One
Choose One
Sheet Flow- No Energy Dissipation Required
Concentrated Flow- Energy Dissipation Provided
Plantings
Seed (Plan for frequent weed control)
Sand Grown or Other High Infiltration Sod
Choose One
YES
NO
YES
NO
UD-BMP_v3.07 RG2, RG 7/15/2021, 9:47 AM