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~f'ora, ~1wn a~~aiitnh 3nc 4sF.o6 <br />f MGIMIf et~CONeT xYCTOxe SITE PREPARATION & DRAINAGE REV. 1 <br />^~st uxs crtr, uT~M 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 ~VE'S7CQr) r-BLS ~iESEsftio [A~vE JOB NO.~G 39._~-_ <br />SEOiw+cNTa~__~,~_ Q••~n...~~__P_Ye~c7/)I~.--- POND NO. ~P_! <br />BV Wn (~J~YKb`•DATE :D-b•0J CHECKED BV DATE <br />CeV. ~-8~ - ~ -- ----- <br />9. DESIGN OF EMERGENCY SPILLWAY <br />10 year 24 hour Storm Discharge 010 =32~2cfs (Sea Section 6) ' <br />25 year 24 hour Storm Discharge 0~ =4B•4cfs <br />1t7~ year 24 hour Storm Discharge 0(~~ =IlLsccfs ~ncluci~S wi3~Gr$4.~dsrJ(iV.l-3~u~-;~ <br />:,ee sL,ca~s ~ICt 11d~ <br />HP= 4' h L=3~`Lh b=~h F= Z.O <br />(max) <br />Spillway material 2 ~ P ZAD n = O.o4 allowable velocity ~ 2 h/see <br />0= ODES-naRlNC. = 117,6 - 32.2= lids <br />or 0=ODES =l~~~s (Assume Principle spillway Plugsedl <br />0 =11'i. 5 = 36 ~ <br />L Hp = ~ a (Charts ES-610 SCS TR No. 35) <br />b Ib <br />Se =~QVe = 6_I (Charts ES-600 SCS TR No. 35) <br />Top of Dam Eleration =Crest of Em. Spillway + Hp + 1.0 ft <br />= 5626+ ?.O + 1.0 ft =r~bZ9 ft (Settled Elevation) <br />,` L}SE~~ 5(02 <br />Earth spillway '- ~~`'~'~~ <br />7 ~ Control <br />section T\ <br />.~ channel HP =~Or Control5ection <br />/ Lerel section Lerel Section <br />v <br />1 <br />MtN. 30' <br />Inlet channel <q°k <br />CL Embankment Hp So ~ <br />%an of earth spillway L <br />Profile of emergency spillway <br />Hp = Difference in elevation between vest of earth spillway et the <br />Control section and water surface in reservoir, h. <br />b = Bottom width of earth spillway at the control section, h. <br />n = Manning's cceffieient of roughness <br />0 = Total discharge, in cfs <br />Se = Flattest slope allowable for channel below control section, %. <br />Ve = Velocity, in feet per teeond, that will exist in channel below <br />Control section (at design 0) if constructed to slope, S, that is <br />shown. <br />x Side dope ratio. <br />a I-a-- <br />1 11 <br />I b I <br />Cross section of earth <br />spillway at control section <br />