Laserfiche WebLink
,fr, <br />u <br />afo[>).13aCOn s Davie ~itah ,ant. asF-o5 <br />FIYeiME[aa.COatT11UCTOa• SITE PREPARATION & DRAINAGE REV. 1 <br />s~[t uae cnr, ut•w STANDARD FORM <br />RUNOFF f4 SEDIMENT CALCULATIONS 9/80 <br />SHT. 11 OF 12 <br />DETEflMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT ~~~~i00 /L!/n/E JOB NO. U~"346 _ <br />__ __J4EFU,SE__/J/?f~ ~ I _ POND NO. ~~'I <br />BV _~M_u/ DATE _9'.30-'2O_ CHECKED BV DATE <br />9. DESIGN OF EMERGENCY SPILLWAY <br />10 year 24 hour Storm Dixharge 010 = // 5 rft (See Section 61 <br />25 year 24 hour Storm Dixharge 025' 23 efs <br />-year 24 hour Storm Discharge 01 I = -cfs <br /> <br />Hp=2~0 ft L'~~ft b= /D ft Z= 2 <br />Imax) <br />Spillway material /7rP 10~ln n =~_ Allowable velocity ~;_ ft/sec <br />0 ° ODES'•OPRINC. _ - __ _cfs <br />~~. or D' ODES = 2~cfs (Auurne principle sPillwaV Plugged) <br />4' ~2 ~ _ ~:~ ~ Hp = '/~ (Charts ES-670 SCS TR No. 35) <br />b /~ <br />Se = 262+ Ve' q_L (Charts ES•600 SCS TR No. 351 <br />Top of Dam Elevation' Crest of Em. Spillway + Hp + 1.0 ft <br />+ / 7 + 1-0 ft = 8T~ 3 ft (Settled Elevation) <br />USA. ag.0 <br />Earth spillway <br />Control <br />section <br />channel Hp Control Section <br />/' Laval section Leval Section <br />1 <br />MtN, 30' <br />Inlet channel S ' ~ S <br />CL Embankment NP o e <br />Plan of earth spillway L <br />Profile of emergency spillway <br /> <br />Hp = Diffsrana in alaration between nest of earth spillway at the <br />control section and water surface in reservoir, ft. <br />b =Bottom width of earth spillway at the eonVO1 section, ft. <br />n = Manning i cceffieiant of roughness <br />O = Total disctsarge, in efs <br />Se = Flattest slope allowable for channel below control section, %. <br />Ve = Velocity, in feet par second, that will exist in channel below <br />control action (at design DI if eonsvuetad to slope, $, that is <br />shown. <br />z Side slope ratio. <br />Z I+Z- <br />~1 111 <br />I b f <br />Cross section of earth <br />spillway at control section <br />