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HomeMy WebLinkAboutSW8060442_COMPLIANCE_20060928STORMWATER DIVISION CODING SHEET POST -CONSTRUCTION PERMITS PERMIT NO. SW DOC TYPE ❑ CURRENT PERMIT ❑ APPROVED PLANS ❑ HISTORICAL FILE COMPLIANCE EVALUATION INSPECTION DOC DATE ?x%F.CJ`}a& YYYYMMDD WET DETENTION POND ANALYSIS FILE NAME: S:IWQSIPOND1060442.WK1 PROJECT #: SW8 060442 REVIEWER:'L .:L ew►s PROJECT NAME: Commercial hllini Mall Shallotte DATE: 28-Sep-06 Receiving Stream: Sharon Creek Class: SCHQW Drainage Basin: Lumber....,:.;:. Index No. �c`•25.=-`` -�Z Site Area -:<> 204 > acres Drainage Area 88$620E) square feet Area in Acres 2.04 IMPERVIOUS AREAS Rational C Buildings 157D0 00 . square feet Parking .4t765 DO square feet SW 369,0 00 ` square feet Street _.,.._::::.432a.40:`squarefeet TOTAL SURFACE AREA CALCULATION % IMPERVIOUS Des, Depth TSS, 85 or 90: 74.02% 35 square feet square feet square feet square feet Rational Cc= 0.05 SA/DA Ratio 7.40% Req. SA 6578 sf Prov. SA 6C0>1' sf VOLUME CALCULATION * place a "1" in the box if Rational is used Rational ?* Des. Storm 1:00< inches Rv= 0.716 Bottom :.:-28�msl Perm. Poo! 3f50.` msl Design Pool 32 5 msl Storage met @elev 32.26 msl Req. Volume 5303 cf Vol. Prov. at DP 7002 cf ORIFICE CALCULATION FOREBAY Perm. Pool Volume= Req. Forebay Volume= Provided Volume= Percent= Elevation Area €......3.150 :�.......:5601.00.�.:::: 3250. 7402 00 <10050: 2a10 Inc. Vol. 7001,50 Avg. Head = 0.47 ft Q2 Area = 1.33 sq. inches Flow Q2, cfs 0.031 cfs Q5 Area = 0.53 sq. inches Flow Q5, cfs 0.012 cfs Orifice Area 1.23 sq. inches No. of Orifices 1', Q= 0.028 cfs Acc. Vol. 0.00 7001.50 Diameter, inches _ i 25 weir x - in in x Drawdown = 2.2 days Surface Area @DP = 7402 sq. ft. Falling Head Drawdown = 3,9 days C: 3.324166667 L= -0.095 COMMENTS Surface Area , Volume and Orifice are within Design Guidelines