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• <br />", ]M= & l dTIIh .3RC. <br />LHarHeeAS coHSTSUCTOSS <br />SALT LASS crrT. UTAH <br />SITE PREPARATION & DRAINAGE <br />STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS <br />4 S F-06 <br />REV. 1 <br />9/80 <br />SHT. 2 OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT WP_5TE2r.7 LES VAA n /A •:E JOB NO. L>G' 3 4 - (o _ <br />QIV y% F.NTA'ioN PLOD r D P0 POND NO. D17 -I <br />BY Vert+ $ieyaS DATE 10•b-b0 CHECKED BY DATE <br />2. SETTLING VOLUME (For 24 -hour detention time) <br />Settling volume = volume of runoff from 10 -year, 24 -hour rainfall <br />10 year, 24 -hour rainfall, inches I ro <br />DETERMINATION OF WEIGHTED RUNOFF CURVE NUMBER FOR CONTRIBUTING WATERSHED <br />• <br />SOIL TYPE <br />HYDROLOGIC <br />GROUP <br />RCN <br />(AMC II) <br />ACRES <br />RCN X ACRES <br />�t� +sat pleeancC eornrley <br />0.92 <br />Sq' <br />35t)z <br />300$ i8 <br />lorriflove"Is- gull'ea <br />17 <br />89 <br />2.05 <br />1$2.4; <br />eeA spic_ - MDge✓Svn � +t <br />G <br />�(0 <br />(o. I(o <br />52 <br />TOTALS <br />44-,03 <br />31ZI. <br />WEIGHTED RCN, AMC II = (TOTAL RCN X ACRES) /TOTAL ACRES <br />G4.51 <br />RUNOFF, INCHES 0, ( o 5 (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 <br />RAINFALL <br />INCHES <br />RUNOFF <br />INCHES <br />RUNOFF <br />AC. FT. <br />25 <br />2.2 <br />0.92 <br />.38 <br />