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~~13IIOataSaV~.3~tnh 3nc 4-SFd6 <br />swaswssaa.coraT^ucroaa SITE PREPARATION & DRAINAGE <br />STANDARD FORM REV. 1 <br />awss uu em, vrwrr <br />RUNOFF & SEDIMENT CALCULATIONS y~o <br />SHT.I IA OF 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT tJ~.te;¢.l Ti~E~t I~srszat~o /ili..lE J08N0. ~1C-~?4Co <br />~DrNCr-~T~T~Gr~] i~~-rso tcR 1~.-~o2TAt~ POND NO. LP-1 <br />BY(P~a4rorJ DATE <br />R;ui6ad Gl,ot_~ <br />CHECKED BY DATE <br />6. Peak Rate o1 Discharge ~ Used to Design Emergency Spillway, Road Culverts and Interceptor Ditches <br />Drainage Area = t'-Q .l I Acres <br />Hydraulic Length = 3 ~ 80 _ Feet e ~ Z~c."- <br />Equivalent Drainage Area' 43 ~4- Acres (Fig, 7 ; TP-149) <br />Avera Natershed Slo Z5 (o tz ~ ""' ~~ ~ !- ~~ <br />Weighted Watershed Runoff Curve Number = ~~•7 <br />A. Peak Rate o1 Discharge From Charts ES-1026, ES-1027, TP-149 <br />Rainfall Frequenq = IG'o Years Rainfall Depth = Z . ~ Indses <br />Ol(For~~ RCN 11 = O(ES 702_for ~-rs~-v slopes) x Slope Correttion Factor (Ex. 2.Ot <br />I Q-i~i x I . I O = ~ G,7 GS cfs <br />021For ~ RCNy1 ~ 192 x 1 . I D = '' I I • 2 cfs <br />Equivalent Discharge = I(o9.S8 cfs Ilnterpolate Between Ol and Qyl <br />Actual Drainage Area <br />Actual Peak Oiss~+arge =Equivalent Disrfiarge x <br />Equivalent Drainage Area <br />Actual Peak Discharge I (e4 .SS x ( ~Q'~ I I = ~ 17 S * cfs <br />Q3.¢ <br />Note: Ol and Q2 above refer to runoff resulting from RCN"s to nearest 5 X60. 65, 70, etc.) <br />If computed RCN ends in 0 ar 5 160, 65, 70, etc.! , Q2 and the next line wdl not <br />be needed. In this rase, Ol runoff will be the equivalent Discharge. Refer to <br />SCS-TP-149 and Engineering Field Manual, Chapter 2. <br />Type 1 Storm distribution ES-1026: Hawaii, Alaska coastal side of Sierra Nevada <br />end Cascade Mountains in California, Oregon and Washington. <br />Type II Storm distribution ES-1027: rest of United States, Puerto Rico, and <br />the Virgin Islands. <br />* '~ntl~ades llssnol'F 4ro.n rjra~~rx C•f'rL SWEt-3$ ~ Su1C~- ~-O dssuMtr,9 <br />cvt-ofG ,~ic6.. t: arc ~1..5vrd or Clo.d.d and add.~~owa~ water <br />-,s dr.ec~ed -+o +l.tz c+~ and '~w{o po..d n?- 1 Fn. <br /> <br />