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<br />,~, ~4acon a'aavFeZitah inc. <br />^rarr~ u~-t or ~T ~ucT ors <br />fl~lT 4R~ CRT. r,T~r <br />4•SF-06 <br />SITE PREPARATION & DRAINAGE REV. ~ <br />STANDARD FORM <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 />PROeECr (xSE/,'ADO M/n/E .IOB No. UC346 _ <br />fQEFUSE A/P~A ~/ POND NO. P'~ __ <br />BY .DM W DATE 9-25-80 CHECKED BY _ DATE _ _ <br />2. SETTLING VOLUME (For 24-hour deten[ion time) <br />Settling volume =volume of runoff from 10-year, 24-hour rainfall <br />10 year, 24-hour rainfall, inches /'8 <br /> <br />DETERMINATION OF WEIGHTED RUNOFF CURVE NUMBER FOR CONTRIBUTING WATERSHED <br /> <br />SOIL TYPE HYDROLOGIC <br /> <br />GROUP RCN <br /> <br />IAMC III <br />ACRES <br />RCN X ACRES <br />(Jv1Sr5 to r 6- <br />~r kn,~ sa.,d G <br />79 <br />SD <br />632~a <br />/?e~u,S~-i7~c/NIMr/-Lore <br />~r/e Fine C f~2 /2•G /,D-33 •2 <br />Tsd ~,~ s~drA~•~ <br />r" F-.,e Sir c 92 3.9 ._ .....3/98' <br />f~on/ Ar~R <br />~~h~ C Q 2 0 8 73-G <br /> <br />TOTALS 25.3 2,OS8•G <br />WEIGHTED RCN, AMC II = (TOTAL RCN X ACRESI/TOTAL ACRES - g/.9 <br /> <br />RUNOFF, INCHES • s I SCS•TP-149 p.5 1 <br />RUNOFF, ACRE-FEET /'2~ I Contributing drainage area, acres X runoff, inches/12 I <br />ADDITIONAL RUNOFF VOLUME CALCULATIONS <br />FREQ. <br />24HR STM RAINFALL <br />INCHES RUNOFF <br />INCHES RUNOFF <br />AC. FT. <br />2s 2.2 • 7 /. <br /> <br /> <br /> <br /> <br /> <br />\J <br /> <br />