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~~3acarta~avka~tnh~nc, 4-SF-06 <br />s^a~^se[s-co^sT^ucro^a S17E PREPARATION & DRAINAGE <br />STANDARD FORM REV. 1 <br />4lT U[r CRT, IrTAM <br />RUNOFF & SEDIMENT CALCULATIONS y~o <br />SHT. S OF 12 ~ <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT ~VE~iTEVJ ~uG-1.3 fhse(Lano //~iuE JOB NO.I~G•34G <br />SEt7~vnENTATia..+ ~•r-+r~ Fug I"~Po2Tnc POND NO. OP I <br />BY km IJ~(CI(ES DATE I y • U ~ tfo CHECKED BY DATE <br />6. Peak Rate of Dixharge -Used to Design Emergency Spillway, Road Culverts and Interceptor Ditdtet <br />Drainage Area = 44'• 03 Aeres <br />Hydraulie length = 'Jr 180 Feet Q ^_ ?~ A -~ <br />Equivalent Drainage Area = 93.4 Acres (Fig. 7 ; TP-149) <br />Average Watershed Slope = `1.3.4 % x,460 ~o') _ 0,23x4 <br />d6.oi (aaSVe~ <br />Weighted Watershed Runoff Curve Number = b4'S <br />A. Peak Rate of Dixharge From Charts ES•1026, ES-1027, TP-149 <br />Rainfall Frequency = 1 ~ Years Rainfall Depih = 1 • $ Inches <br />011For~_ RCN1) = OIES 102_for31EE slopes) x Slope Correction Factor (Ex. 2.0) <br />- 38 x l.08 = 41.od ~, <br />021For~ RCN21 = ~/o x I.O$ = 11 .2S cy <br />Equivalent Discharge = fO0.2 (O efs (Interpolate Between 01 and 02) <br />Actual Peak Discharge =Equivalent Discharge x Actual Drainage Area <br />Equivalent Drainage Araa <br />Actual Peak Discharge 1o1~•Zfi x 1 44 .03 1= 32.2 efs <br />934 <br />Note: 01 and 02 above refer to runoff resulting from RCN's to nearest 5 160, 65, 70, etc.) <br />If computed RCN ends in 0 or 5 160, 65, 70, etc.) , 02 and the next line will not <br />he needed. In this ease, 01 runoff will be the equivalent Discharge. Refer to <br />SCS•TP-149 and Engineering Field Manual, Chapter 2. <br />Type I Storm distribution ES-1026: Hawaii, Alaska coastal side of Sierra Nevada <br />and 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 />• <br /> <br />