PW 3rd Revision Documentation (PPRI22-0008)I
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Comp. By: d.Martin Check of numbers
1 Date: 7/25/2023 P U D L I C WORKS
U
6APPROVED
Public Works Department { } DENIED
City of Atlantic Beach { LE 0 DEPS
Permit No: I!OOMBBNOM
Address:
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 Re uired for Impervious Area:
Lot Area = 4,030 ft2
Impervious Area (A) = 1,783 if = 44.24%
V = 0.92 x 1,783.0 x 9.3
/ 12
V = 1,271 ft3
Provided Stora-ge
Area 1 - Relative Elev. Area Storage Sideslope: :1
(ft) (ft) (ft3)
BOTTOM size:
X
TOB size:
X
Area 2 - Relative Elev. Area Storage
(ft) (ft) (ft3)
BOTTOM size:
X
TOB size:
X
Area 3 - Relative Elev. Area Storage
A (ft2) (ft3)
BOTTOM size:
X
TOB size:
X
Inground Storage: = A" d/pf
Total Storage Area at TOB (A) = 457.6 ft2
Depth to ESHWT from BOTTOM (d) = 3.0 ft, default is 2.0 ft, verify onsite ESHWT
Pore Factor (pf) = 0.4 default is 0.4
Inground Storage Provided = 549.1 ft3
Required Treatment Volume = 1,271 ft3 50% Requirement on 1271 =
635.5
Supplied Treatment Volume = 757 ft3
Retention Takeoff and QTY Sheet % Impervious -1962 Francis Avenue PPRI22-0008 7/25/2023
Comp. By:
Date:
" 'f - ,
Public Works Department
City of Atlantic Beam
Permit No.
Address I9e2 francs Averme
Required Storage Volume
Cdwa:
Sectan 24-88 of the City of Atlantic Beech's Z.orwv, Sul!), on, and Land Devebp rm t Regulations requires
that stormwater runoff from impervious areas be stand onsite. Volume to be retained is as fol$ows
V - C, R `12 which is the Modified Rational Method for estimating stormwater runoff
Where. V = Volume of Runoff to be stored (cubic feet)
C = Rurpff Coefficient 0.99 the difference between impervious area (C=1.0)
and undeveloped condlMorw (C- 08).
Impervious Area (square feet)
R= yr 124 -hr rairrfaM depth (9,3 inches for Atlantic Beach)
,site 8eor a Volume R ui►ed loos Area:
Lot Area = 4,636
impervious Area (A) - 1.763\,fVe
V = 0.02 x .3
V
pUBLIC VVaFtKs
VA99ROVED
pEN1EDF'97'p ICA131 rT0
f
DENIED
Area 1 - RekMve Elev.
Ars
Storage
slope:
;1
M)
W)
(V)
10.3
BOTTOM
tze:
X
11.0
TOB
e:
x
Area 2 - Relative Elev.
Area
Storage
im
(f>)
(n'i
6.7
OM
size:
X
so
OB
size:
x
Area 3 - Relative Elw.
Area
Storage
BOTTOM
size:
X
TOB
size:
x
tnground Storage: - A"d/p/-
Required
Total Storage Ars at TO
Depth to ESHWT from BOTTO8
Pore Facto(pt)4
Inground Storage ProvTreatment Volume
Supplied Treatment Volume
fe
ft, defaurt is 2.0 R, verify onsfte ESHWT
defauk Is 0.4
fe
28.6
fe 60% of required per agreerrlant 1271 x 60% - 636
ft'
Rewtm 1952dfmnaW 711&2023