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• <br />~brD, J3ncrn a~'I'~eZitah <br />~nc. 4sF-os <br />_, <br />~rarr~~~~~cor~truttors <br />~~li urn CRS <br />VTAr SITE PREPARATION & DRAINAGE <br />STANDARD FORM REV. 1 <br />, RUNOFF & SEDIMENT CALCULATIONS 9/80 <br /> SHT. 20F 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT y~ESTbti?J 'FJELS (DESEt2D0 /A~u1= JOB NO. t~G-3¢i'o _ <br />Gµ ELK f~A YY~S i1LOrJL SGUUa etil C-rJLCF~ POND NO. <br />BV ~~ f'~~:4.rs DATE 3_T~I CHECKED BY DATE <br />2. SETTLING VOLUME (for 24-hour detention time) <br />Settling volume =volume of runoff from 10-year, 24-hour rainfall <br />10 year, 24~hour rainfall, inches I . ~ <br />DETERMINATION OF WEIGHTED RUNOFF CURVE NUMBER FOR CONTRIBUTING WATERSHED <br />• <br /> <br />SOIL TYPE HYDROLOGIC <br /> <br />GROUP RCN <br /> <br />IAMC III <br />ACRES <br />RCN X ACRES <br /> <br /> <br /> <br /> <br /> <br />TOTALS <br />WEIGHTED RCN, AMC II = (TOTAL RCN X ACRESI/TOTAL ACRES '7~ ~ <br />it VALUE ~eOr+'1 5G1W-I ATt.gA. NIAJo2 EArJ WP?E12 A2EA FoQ SGULG~ <br />GVl{tl <br />RUNOFF, INCHES <br />(SCS-TP-149 p.5 1 <br />RUNOFF, ACRE-FEET ~~~ A=~tS 1 • Z (Contributing drainage area, acres X runoff, inches/12 1 <br />57L~.6 acres I .(o <br />ADDITIONAL RUNOFF VOLUME CALCULATIONS <br />r <br />FRED <br />24HR STM RAINFALL <br />INCHES RUNOFF <br />INCHES RUNOFF <br />AC. FT. <br />25 2.2 d. I. ~~ 2a ,c <br /> <br /> <br /> <br /> <br /> <br />