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ork Aa= &Vavb 7jtah 3nc <br />uva era 1 aa.COnataucTOKE <br />&ASS LAKE em, utAM <br />SITE PREPARATION & DRAINAGE <br />STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS <br />4 -SF-06 <br />1 <br />9/60 <br />SHT.1 OF 12 i s <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT 1�.-,Et?nt)o /i liJF. JOB NO. o(- ?4(o <br />DrNCr- 1T�T�Gr�] i�� -rso tcR 10.-='o 2TA L— PONDNO. rP -1 <br />BY ZaV44rc-J DATE <br />9eVilsea 4"e-+ <br />CHECKED BY DATE <br />6. Peak Rate of Discharge - Used to Design Emergency Spillway, Road Culverts and Interceptor Ditches <br />Drainage Area = (A .1 I Acres <br />Hydraulic Length = :!:,I 80 _ Feet e -ar <br />Equivalent Drainage Area' 43 4- Acres 1 Fig. 7; TP -149) <br />Average Watershed Z5 (o z�' ""� 1 '2� <br />9e Pe = % t 4a ra <br />Weighted Watershed Runoff Curve Number = ES.7 <br />A. Peak Rate of Discharge From Charts ES -1026, ES -1027, TP -149 <br />Rainfall Frequency = IG'o Years Rainfall Depth = Z - (e Inches <br />01(For R5 RCN1) = O(ES 102_for ' slopes) x Slope Correction Factor (Ex. 2.0) <br />I 4-?7 , x I.IO = ("7 GS cfs <br />02(For ' 30 RCN2) = 192 x 1 . I t7 n 11 • 2 cfs <br />Equivalent Discharge = 1169 -Se) cfs (Interpolate Between 01 and 02) <br />Actual Peak Discharge = Equivalent Discharge x Actual Drainage Area <br />Equivalent Drainage Area <br />Actual Peak Discharge I (a4 .SS x ( (�d.1 l 1 = 117 S * cfs <br />q3.¢ <br />Note: 0 and 0 above refer to runoff resulting from RCN's to nearest 5 1 60. 65, 70, etc.l <br />If computed RCN ends in 0 or 5 160, 65, 70, etc.) , 0 and the next line will not <br />be needed. In this rase, 0 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 />and Cascade Mountains in California, Oregon and Washington. <br />Type 11 Storm distribution ES -1027: rest of United States, Puerto Rico, and <br />the Virgin Islands. <br />* '1nr-k"8es tuvhoFF Provh dva i".Ie d'eas SWEt-'S$ Su1C�- �O ass uMhr , r� <br />c�!_o d ict.s are: �1..5ed cr Clo.A.d ^nil aAAA,owal wailer <br />s d +o +b.e cke- and 'iw�o po. d D ?- 1 Pne <br />�;};eesl tlr 1ilk ,r.` -Deei9n <br />