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<br />~'ot>J, ~3acon s~vi6liuth ,inc. asF.o6 <br />lNGINIle^~CONaT11UCTex• SITE PREPARATION & DRAINAGE REV. 1 <br />GAIT Ll.il CRY, UTAH STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS g/80 <br />SHT. 10 OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT ~ DES~~Pit'UD /y1U/E _ _ _ _ _- . _ JOB NO. /~~'S _ <br />.E?EF//~E ,~~F/J '.~~ _ POND NO. _%PP~ <br />gY ~DMd'/ _pATE `I'7d-8D CHECKED BV ___-__ DATE _ _ <br />8. PRINCIPAL SPILLWAY DESIGN <br />10 year 24 hour Storm Discharge O = /S•O cfs {See Section 6) <br />A. Drop Inlet With Spliner type Headwall (SCS Engineering Field Manuall <br />L=111Ltt. Y=,~_ft. H=11L_tt. O=~_cts <br />Dp = 1B i. Fig 6.25 or Fig 6-26 <br />Dr= ~~~Fig6-27 /-1=5.2~If•l/OX•o3G-1~=~/: <br />h (req'dl = ^8 Fig 6-27 <br />h (used) _ ~~ <br /> <br />8, Anti Saep Collars (Increase Seepage paM by 15%) <br />SP'~2' 3 <br />Ls'v(2+4) [1 25 Sp =~'(3+4) [T+,25` <br />n =_~V= 2.0 <br />Ls+2nV? 1.15Ls q91 +2x3 x? >1.15x 991 <br />Max. Collar Spacing = 14 V = 74 x 2 =~~ ~t <br />Emergency Spillway Crest <br />-~ -____. <br />h Riser Assumed Phreatie Line <br />= Anti•seep collars Z <br />Prinei le D 1 1 <br />P y r 1 ~ Pi=e conduit <br />Spillway <br />Crest Dp - ---~--> ~ <br />Ls <br />L <br /> <br />H ° Head on pipe spillwsy (pipe Howl, centerline of outlet to amargsnty spillway <br />crest or to design high water if no emergency spillway <br />h = Head over riser crest 11.0 min.) <br />L = length of pipe <br />D = Diameter of pipe conduit <br />DP= Diameiar of riser ` <br />SD = Slope of pipe conduit <br />n = No. collars <br />V = Colar projenion 12' min.) <br />Cs = Collar spacing <br />1 <br /> <br />• <br /> <br />n <br />c <br />-s <br />