1209 W Plaza Comp. By: Brian Vonn
Date: 3/13/2013
JOB COPY
1� THIS PLAN MUST SE
Public Works Department ON JOE SITE FOR
City of Atlantic Beach EACH INSPECTION
Permit No: 12-xxx
Address: 1209 W Plaza
Required Storage Volume
Criteria:
Section 24-66 of the City of Atlantic Beach's Zoning, Subdivsion, and Land Development Regulations
requires that the difference between the pre- and postdevelopment volume of stormwawter runoff be
stored on site. Volume of Runoff is defined as follows:
V= CAR/12
Where: V= Volume of Runoff
C = Coefficient of Runoff
A=Area of lot in square feet
R= 25-yr/24-hr rainfall depth (9.3-inches for Atlantic Beach)
Predevelopment Runoff Volume:
Lot Area (A) = 17,340 ft'
Runoff Coefficient
Area Lot Area
Description (ft) (ft) "C" Wtd "C"
Impervious 0 17,340 1.00 0.00
Pervious 17,340 17,340 0.20 0.20
Runoff Coefficient(C) = 0.20
Runoff Volume
V= 0.20 x 17,340 x 9.3 / 12
V= 2,688 ft3
Postdevelopment Runoff Volume:
Lot Area (A) = 17,340 ft
Runoff Coefficient
Area Lot Area
Description (ft) (ft) "C" Wtd "C"
Impervious 1,836 17,340 1.00 0.11
Pervious 15,504 17,340 0.20 0.18
Runoff Coefficient(C) = 0.28
Runoff Volume
V= 0.28 x 17,340 x 9.3 I 12
V= 3,826 ft3
Required Storage Volume
DV= Postdevelopment Runoff Volume- Predevelopment Runoff Volume
DV= 3,826 - 2,688
DV= 1,138 ft3
Retention Stormwater Calcs for 1209 W Plaza-Feb Revision.xls 4/29/2013
y Comp. By: Brian Vonn
Date. 3/13/2013
Public Works Department
City of Atlantic Beach
Permit No: 12-xxx
Address: 1209 W Plaza
Provided Storage:
Elevation Area Storage
(ft) (ft) (ft)
A 6.1 1,000 0 TOB
4.1 304 1,304 BOTTOM
B 5.7 160 0 TOB
3.7 72 232 BOTTOM
1,536
Required Treatment Volume = 1,138 ft
Supplied Treatment Volume = 1,536 ft3
Retention Stormwater Calcs for 1209 W Plaza-Feb Revisionxls 4/29/2013