36C26124N0485_-_640-23-105_Demo_B100_Jones_Hall_Mnt_View_-_Pre_Tr.pdf
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- Solicitation number
- 36C26125R0092
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This document is a Stormwater Pretreatment Runoff Calculation for a construction project at Jones Hall Mountain View, prepared by GDM Architects + Engineers and dated 09-10-2024. The calculations demonstrate the volumetric requirements for stormwater management within a 1.06-acre project area, specifically focusing on detaining the first 1 inch of rainfall runoff. The analysis shows that the proposed detention area will capture 3,903 cubic feet of stormwater, which exceeds the required 3,847 cubic feet for pretreatment.
The technical details include a detention basin with a bottom elevation of 21.00 NAVD-88 and a raised rim elevation of 22.00 NAVD-88. The basin has a bottom surface area of 1,991 square feet and bank slopes of 15:1, with a perimeter of 255 feet. The accompanying site plan and cross-section diagrams illustrate the detention basin's layout and characteristics, prepared for the U.S. Department of Veterans Affairs' Office of Construction and Facilities Management.
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Text version
640-23-105 Demo B100 Jones Hall Mnt View –
95% CONSTRUCTION DOCUMENTS
Pretreatment Stormwater Runoff Calculations Date: 09-10-2024
Calculations below demonstrate the volumetric calculations for the pre-treatment of the storm water runoff within the project boundary scope.
Known:
Project area: 1.06 acres
Pre Treatment rainfall (in) first 1 inch of runoff
Total Run off volume Project Area * runoff /12
1.06 acres * 1 inch /12
= 0.09 AF
Dry Detention Sizing Required:
Volume required to be detained for pretreatment: 0.09 AF ~ 3,847 cuft
Proposed bottom of detention area: 1,991 sqft
Bottom of Detention is set at Elevation: 21.00 NAVD-88
Proposed raised rim elevation 22.00 NAVD-88
Detention Bank slopes: 15:1
Perimeter of center of bank: 255 ft
Bottom Surface Area A1: 1,991 sqft
Cross Section of Bank Area A2: (15*1)/2 = 7.5 sqft
Volume of Area 1 V1: 1,620 sqft * 1 ft = 1,991 cuft
Volume of Area 2 V2: 7.5 sqft * 255 ft = 1,912 cuft
Total Volume provided: 3,903 cuft
Volume required: 3,847CuFt
Therefore, Stormwater pretreatment volume requirement has been met with a total detained volume of 3,903 and a raised rim inlet set at 22.00 NAVD-88. See exhibit attached for diagram.
Celyn Dezmain CJD Stamp
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
PB
21.00 21.00
21.00
Feet 0 40 80
Project Number
Building Number
Drawing Number
Project Title
Location
Issue Date Checked Drawn
Drawing Title
Approved:
A
Fi le
P at h 6/
/2
:3
9:
P M
95% CONSTRUCTION
DOCUMENTS
FULLY SPRINKLERED
Office of Construction and Facilities Management
U.S. Department of Veterans Affairs
B
C
D
E
F
A
B
C
D
E
F
21 4 5 6 7 8 9 10
PhaseARCHITECT/ENGINEER OF RECORD A/E:
STAMPCONSULTANT
321 4 5 6 7 8 9 10
GDM OF OREGON
1000 W STEUBEN ST., UNIT 3
BINGEN, WA 98605
(541) 463-4723
CELYN DEZMAIN
WWW.GDM-AE.COM
DEMO B100 JONES HALL
MOUNTAIN VIEW
1776 OLD MIDDLEFIELD WAY, MOUNTAIN VIEW, CA 94043
640-23-105
Project Director
9/10/2024 CD DTRevisions: Date:
EXHIBIT
PROJECT # 640-23-105 STORMWATER
SUBBASIN
CENTROID OF
SECTION
CENTROID OF
SECTION
STORMWATER
SUBBASIN
TOTAL AREA: 1.06 AC
Feet 0 10 20
BOTTOM OF DDA
FG: 21.00
TOP OF BANK
FG: 22.00
DETENTION AREA
BANK
File details come from the government source that posted it. Updated .