365 10th Street Topo SURVEY 05.27.2021(404x50%)2022,66635.5%OVERFLOWPOP-UP6" HARD ADSPIPE TO POP UPAT STREET
35'-0"44'-0"37'-6"29'-0"Comp. By:Date:6/2/2021Public Works DepartmentCity of Atlantic BeachPermit No:RES20-0139Address:365 10th Street (Final) Adam GrayRequired Storage VolumeCriteria:Section 24-66 of the City of Atlantic Beach's Zoning, Subdivsion, and Land Development Regulations requiresthat stormwater runoff from impervious areas be stored onsite. Volume to be retained is as follows:V = CAR/12which is the Modified Rational Method for estimating stormwater runoffWhere: 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 = 7,500ft2Impervious Area (A) = 2,666ft2 =35.5%V = 0.92 x2,666.0x 9.3 / 12V = 1,901ft3Provided Storage:Area 1 - Relative Elev.AreaStorageSideslope::1(ft) (ft2) (ft3)0.01,088BOTTOMsize:37.5X290.801,540TOBsize:44X35Area 2 - Relative Elev.AreaStorage(ft) (ft2) (ft3)0.00BOTTOMsize:0X00TOBsize:X0.75AreaStorage(ft) (ft2) (ft3)0.00BOTTOMsize:0X00.00TOBsize:0X0Inground Storage: = A*d/pfTotal Storage Area at TOB (A) =1540.0ft2Depth to ESHWT from BOTTOM (d) =2.0ft, default is 2.0 ft, verify onsite ESHWTPore Factor (pf) = 0.4 default is 0.4Inground Storage Provided =1232.0ft3Required Treatment Volume =1,901ft3Supplied Treatment Volume =2,283ft31,05100Retention Stormwater Runoff for 10th Street - Final Rev. 6/2/2021