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I <br /> ID. Storm water Flow Control Plan <br /> Narbeck Creek: <br /> I <br /> Flow control calculations for the Narbeck Creek detention tank are provided below: <br /> IPeak flows based upon the above input are as follows: <br /> Peak Flows(cfs) <br /> I2-year 10-year 100-year <br /> Pre-Dev 0.0078 0.0360 0.0598 <br /> Developed 0.1027 0.1801 0.2274 <br /> IAllowable Release Rates (0.0078* .5) = 0.0039 0,0360 0.0598' <br /> I The following are StormSHED's analytical output sheets for the stormwater detention facility <br /> design: <br /> I Start of live storage: 100 0000 ft <br /> Event ;Match Q (cfs):Pea <br /> k Q (cfs) Peak Stg (ft) Vol (cf) Vol (acft) Time to Empty. <br /> 2 year I op2, 0.0036 1104.9873 1020.60 0.0234 150.67 <br /> I10 year f_Wat 0.0318 105.6310 1158.50 0.0266 159.33 <br /> `100 year 0.0589 3 105.9910 1220.31 0.0280 j 159.33 <br /> Event Precip (in) <br /> I <br /> 6 mo 0 9920 <br /> 2 year 1.5500 <br /> 10 year 2.6000 ' <br /> I <br /> 100 year i3.2500 <br /> Peak Q Peak T Peak Vol (ac- Area <br /> BasinlD Event Method/Loss Raintype <br /> j 1 (cfs) (hrs) j cf) (ac) <br /> POST 2 year 0 0801 8.00 0.0272 0.31 SBUH/SCS TYPE1A <br /> I POST 10 year £ 0.1592 8.00 0.0530 0.31 SBUH/SCS TYPE1A <br /> POST 100 year E 0.2082 8.00 0.0693 0.31 SBUH/SCS ,TYPE1A <br /> IPRE 2 0 year .y � 0078 9.17 0.0088 0.31 SBUH/SCS TYPE1A <br /> 1POST 2 year 1-0 0801 8.00 0.0272 0.31 SBUH/SCS ITYPE1A <br /> IPRE 10 year 10.0360 P 8.50 1 0.0262 0.31 SBUH/SCS ITYPEIA <br /> POST 10 year 0.1592 [ 8.00 0.0530 0.31 SBUH/SCS TYPE1A <br /> PRE 100 year 0.0598 8.17 0.0390 0.31 j SBUH/SCS TYPE1A <br /> POST 100 year 0.2082 8.00 0.0693 0.31 SBUH/SCS TYPE1A <br /> 6/16/2011 Stormwater Site Plan Page 25 <br />