W.R. for sending 808 Amberjack Lane RES24-0044Comp. By:
Date:4/24/2024
Public Works Department
City of Atlantic Beach
Permit No:RES24-0044
Address:808 Amberjack Lane
Required Storage Volume
Criteria:
Section 24-68 of the City of Atlantic Beach's Zoning, Subdivsion, and Land Development Regulations requires
that stormwater runoff from impervious areas be stored onsite. Volume to be retained is as follows:
V = CAR/12 which is the Modified Rational Method for estimating stormwater runoff
Where:V = Volume of Runoff to be stored (cubic feet)
C = Runoff Coefficient, 0.92, the difference between impervious area (C=1.0)
and undeveloped conditions (C=0.08).
A = Impervious Area (square feet)
R= 25-yr / 24-hr rainfall depth (9.3 inches for Atlantic Beach)
Onsite Storage Volume Required for Impervious Area:
Lot Area = 8,370 ft2
Impervious Area (A) = 1,980 ft2 =24%Double check of numbers.
V = 0.92 x 1,980.2 x 9.3 /12
V = 1,412 ft3
Provided Storage:
Area 1 - Relative Elev.Area Storage Sideslope:2 :1
(ft)(ft2)(ft3)
11.0 990 BOTTOM size:-2 X -2
11.5 1,258 TOB size:0 X 0
Area 2 - Relative Elev.Area Storage
(ft)(ft2)(ft3)
0.0 0 BOTTOM size:0 X 0
0.0 0 TOB size:0 X 0
Area 3 - Relative Elev.Area Storage
(ft)(ft2)(ft3)
0.0 0 BOTTOM size:0 X 0
0.0 0 TOB size:0 X 0
Inground Storage:= A*d/pf
Total Storage Area at TOB (A) =1257.6 ft2
Depth to ESHWT from BOTTOM (d) =2.0 ft, default is 2.0 ft, verify onsite ESHWT
Pore Factor (pf) =0.4 default is 0.4
Inground Storage Provided =1006.1 ft3
Required Treatment Volume =1,412 ft3
Supplied Treatment Volume =1,568 ft3
D. Martin
562
0
0
Retention W.R. for sending 808 Amberjack Lane RES24-0044 4/24/2024