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<br />~, J3acon s'e~aviaZitah ,inc. 4sF.o6 <br />sre nsseea.cowsTeuctoea SITE PREPARATION & DRAINAGE qEV. 1 <br />a~lT l~xa CRY, UT11N STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS 9/80 <br />SHT. 11 OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT '\V,'-_5'fE12n1 FEELS ~JE56i:AtJO LIirJE_.__--___ JOB NO.I]G•34~ ._ <br />REFUSE A2EA ~ 4c._ _-- _ -- ____-- POND NO. ~ZP~4--- <br />BV f~.lA.\V, DATE `/ • 25~ 60 CHECKED BV DATE <br />9. DESIGN OF EMERGENCY SPILLWAY <br />10 year 24 hour Storm Discharge 070 =uTds (Sea Section 61 <br />25 year 24 hour Storm Discharge 025 =~'4'ds <br />-year 24 (sour Storm Discharge 0( 1 = -cis <br /> <br />HP'? ft L= "1Z it b= Ip ft Z= Z <br />(max) <br />Spillway material 21P RAp n = 0.?4• gllowable veloeityLZ ft/see <br />0 - ODES -OPRINL. = Q[7-µ - ~,fi.7 = I ~i_7 Cfs <br />or 0 = ODES ~ 4 ds (Assume principle spillway plugged) <br />0 = 40.4 = ,04- Hp = ~ •4' (Charu ES-610 SCS TR No. 351 <br />b to <br />Se =0.05 Ve = Ls~ (Charts ES-600 SCS TR No. 351 <br />Top of Dam Elevation =Crest of Em. Spillway + Hp + 1.0 ft <br />=5505•l+ I.`F- + 1.0 ft =`h08•I ft (Settled Elevation) <br />U E ~o~ <br />Earth spillway "~ <br />Control <br />section <br />_ Outlet <br />channel <br />/ ~ Hp - 1.1- <br />Level section Level <br />I <br />Inlet channel <br />CL Embankment H <br />//~I p <br />Plan of earth spillway I~ <br />e <br />Profile of emergency spillway <br />,~ <br />Hp = DiHerenca in elevation between crest of earth spillway at the <br />control section end water surface in reservoir, ft. <br />b = Bottom width of earth spillway at the control section, ft. <br />n Manning's coef}ieient of roughness <br />0 = Total discharge, in cfs <br />Se = Flattest slope allowable for channel below control section, %. <br />Ve = Velocity, in feet per second, that will exist in channel below <br />control section (at design 01 if constructed to slope, S„that is <br />shown. <br />z = Side slope ratio. <br />MIN' <br />L <br />Cross section of earth <br />spillway at control section <br />Z rZ <br />~1 11 <br />I- b f <br />Control Section <br />0 <br />n <br />D <br />10$0 <br />