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• <br />~. ~d00'R 3~dVf8 ~TIIII .3RC, 4 s F ~06 <br />~warru[rrrr~co~rrrrtucrort~ <br />swir uarr crrr. urwn SITE PREPARATION f4 DRAINAGE <br />STANDARD FORM REV. 1 <br /> RUNOFF & SEDIMENT CALCULATIONS 9/80 <br /> SHT. 2 OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT \yE51E2r.7 ~~~aLS LES L'Ago /A •:E JOB NO. L>G' 34(0 _ <br />~Y71mE.NTA'ioN PctifD Fp4 D-PorCTAL POND NO. DV'I __ <br />gy V~rt+ $IPJI.~S DATE 10•b~b0 CHECKED BV DATE <br />2. SETTLING VOLUME (For 24-hour detention time) <br />Settling volume =volume of runoff from 10-year, 24-hour rainfall <br />10 year, 24-hour rainfall, inches I ~ <br />DETERMINATION OF WEIGHTED RUNOFF CURVE NUMBER FOR CONTRIBUTING WATERSHED <br />• <br /> <br />SOIL TYPE HYDROLOGIC <br /> <br />GROUP RCN <br /> <br />(AMC I1) <br />ACRES <br />RCN X ACRES <br />IZt~~s4c ~rceancc (?on,~la~ F3 Sq' 35.bZ 300$. i8 <br />ri~lvven~s• gull~er <br />'(p~ 17 8 <br />9 2.05 I$2.4i <br />n pp <br />1 <br />aenTSRG'Mc~C/Svnt,y+~t'•r\%^`~rh G q <br />/ <br />, <br />~(o (o.l(o ~iZ~1.?(. <br /> <br /> <br />TOTALS 4.4,Oj 3'jZI. 09 <br />WEIGHTED RCN, AMC II = (TOTAL RCN X ACRESI/TOTAL ACRES G4.51 <br /> <br />RUNOFF, INCHES ~• /05 (SCS-TP~ 149 p.5 I <br />RUNOFF, ACRE-FEET 2.36 (Contributing drainage area, acres X runoff, inches/12 1 <br />ADDITIONAL RUNOFF VOLUME CALCULATIONS <br />• <br />FREQ. <br />24HR STM RAINFALL <br />INCHES RUNOFF <br />INCHES RUNOFF <br />AC. FT. <br />25 2.2 0.92 .38 <br /> <br /> <br /> <br /> <br /> <br />