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t <br />• <br />~ a9aam a'~aviaZitah inc. a-sF.os <br />^rrlr~~w~~cor~TrrxTOlrs SITE PREPARATION & DRAINAGE qEV. 1 <br />~wiT uw~ orrr, rrtwr STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS 9/80 <br />SHT. 1 OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT L~SE.Crtoa ~t•IiNE JOB No. LG3~ <br />rtEF USG AREA ~ ~ POND NO. ~~ <br />BY .DM W DATE 9-~.~~ CHECKED BV DATE <br />1. SEDIMENT VOLUME <br />CONTRIBUTING DRAINAGE AREA, ACRES <br />DISTURBED AREA IN CONTRIBUTING AREA, ACRES /5 ~3 <br />A. Sediment Volume = .1 acre ft. of sediment per acre of disturbed area. <br />_ .1 acre~ft./acre X /S ~3 acre <br />_ /•.Sj acre-f t. <br />B. Sediment Volume = 3 years sediment from entire watershed as determined by the Universal <br />Soil Loss Equation IUSLEI USLE : A=RKLSCP <br />• <br />Where' A = Average annual soil loss in tons/acre. <br />R = Rainfall factor <br />K = Soil erodibility factor <br />LS = Slope length and slope gradient factor <br />C = Cover factor <br />P = Erosion control practice factor <br />Watershed must be divided into sub areas if different factors occur for different areas within the watershed. <br /> <br />SUBAREA <br />I.D. NO. SUB AREA DISCRIPT ION AREA <br />Ar R K LS C p q TONS <br />A X Ar <br /> <br />l n rs wr e~ <br />7"' ~ S, <br />8'•0 <br />30 <br />•28 <br />/ 092 /•D • 35 <br />282 <br /> <br />2 f2e~isa -'~sc/oirnrt/-Bare /26 30 •2$ g /~U /•r)) <br />67z <br />896.72 <br />3 To .y S)eS9C 3 9 3b •28 8 /•U /•D <br />67.2 <br />262.Ory <br /> <br />9 /•~on r a <br />~;, ~ s4.,s <br />o•a 30 28 •S /-U /•0 •q2 3~3i. <br /> <br /> <br /> <br /> <br />TOTAL AREA TOTAL TONS PER YEAR (~ r/9.98 <br />/ TONS/YEAR a 2t1001b/TON a 3 YEARS <br />SEDIMENT VOLUME (ACRE FEET) = I <br />(Settled Density = ~JZIb/it3) ~~ Ibr/(t.3 >< 43660 ItZ/ ACRE <br />C'CT_ ww A I~11` ~ / _ ~ R <br />/~9z <br /> <br />