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...~ <br />~'ora,~acona~nvi67itnh inc. a-sF-o6 <br />tMerwtee^ coMSr~uerow• SITE PREPA RA 7ION & DRAINAGE REV. 1 <br />twsr swx[ cit r. urwn STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS 9180 <br />SH T. 100E 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT \~/ESTE21J FVELS pESEKAYJO /niIJE: JOB NO. Lam''-4~ <br />REFVSE A2EA `~ 4 _ POND NO. -2 P- 4 <br />BY 17. I~.\V. DATE 9.25 • fi ~ CHECKED BY DATE <br />B. PRINCIPAL SPILLWAY DESIGN <br />10 year 24 hour Storm Discharge O = 2L' cts lsee Section 61 <br />A. Drop Inlet With Splitter type Headwall (SCS Engineering Field Manual) <br />L= ~C ft. Y= 4' ft. H= ~' ft. 0=43-~4cfs <br />Dp = ~' Q_ Fig 6-25 or Fig 6-26 <br />Dr = 3~e" Fig 6-27 <br />h (req'd) = 0.35 Fig 6-27 <br />_T <br />h (used) = I.O <br /> <br />B. Anti Seep Collars (Increase Seepage path by 15Yo) <br />gp= o.of z= 3 <br />Ls=vlz+al ft+SS I = 4 13+a1 (1+0.0~ ~ = 29.2 <br />.25-SP .25- .oi <br />n _ Z V = Z <br />Ls+2nV> 1.15Ls 29 •? +2x? x? >1.15x29.2 <br />Cs = ~ ~'L ? '~3~54 <br />Max. Collar Spacing = 14 V = 14 x? _ _~_ <br />Emergency Spillway Crest <br />~_ ..._. <br />h Riser Assumed Phreatie Line <br />= Anti-seep collars 2 ~ <br />4 <br />Principle Dr 1 1 `Pipe conduit 1 <br />Spillway y <br />Crest DP p - ~ ~ ~~ <br />V Cs <br />Ls <br />L <br />F°~, <br />'`~::-~ <br />H = Head on pipe spillway (pipe Howl, centerline of outlet to emergency spillway <br />crest or to design high water if no emergency spillway <br />h = Head over riser crest (1.0 min.) <br />L = Length of pipe <br />DP = Diameter of pipe conduit <br />Dr = Diameter of riser <br />Sp = Slope of pipe conduit <br />n = No. collars <br />V = Collar projection (2" min.) <br />Cf = Collar spacing <br />• <br />u <br />~' <br />a <br />0 <br />10-80 <br />