365 10th St RES20-0139 Storm Water Restrictive CovenantComp. By:
Date:5/13/2020
Public Works Department
City of Atlantic Beach
Permit No:_____________________________
Address:365 10th Street Atlantic Beach 32233
Required Storage Volume
Criteria:
Section 24-66 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 = 7,500 ft2
Impervious Area (A) = 2,892 ft2 =38.6%
V = 0.92 x 2,892.0 x 9.3 /12
V = 2,062 ft3
Provided Storage:
Area 1 - Relative Elev.Area Storage Sideslope:2 :1
(ft)(ft2) (ft
3)
0.0 1,183 BOTTOM size:43 X 27.5
0.75 1,403 TOB size:46 X 30.5
Area 2 - Relative Elev.Area Storage
(ft)(ft2) (ft
3)
0.0 0 BOTTOM size:0 X 0
0.00 0 TOB size:0 X 0
Area 3 - Relative Elev.Area Storage
(ft)(ft2) (ft
3)
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) =1403.0 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 =1122.4 ft3
Required Treatment Volume =2,062 ft3
Supplied Treatment Volume =2,092 ft3
SW
970
0
0
Retention Stormwater Runoff for 10th 369 5/13/2020
2'-0"2'
-
0
"
46' X 30.5' X 9"d
ONSITE WATER
RETENTION
: With Turf Block 214 SQ FT
2,892 SQ FT
2,892
38.6%
2'-0"
30
'
-
6
"
46'-0"
Grade site to drain to
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