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.-- <br />c <br />~1L[>a~IIC011 a<~dVfB~LIIII ~11C. SITE PREPARATION & DRAINAGE 4•SF-06 <br />awsruae-co~neuctoea REV. 0 <br />a.tt uaa trtv, than STANDARD FORM <br />RUNOFF f4 SE DIMEN7 CALCULATIONS 7ny <br />SH7. OF <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT WESTERN FUELS UTAH INC ~ DESERAPO MINE JOR N0. UC•34/o- 104 <br />HAUL ROAD DrzAINAGE ~ TYP. IH~~ ~Gu I_VE lZT VJATEIRQ EAD W ¢ <br />BVGIFaIrJ B- DATE APR. 9 ~Iq»p CHECKED BV DATE '_ <br />6. Psak Rate of Discharge -Used to Design Emergency Spillway, Raced Culverts and Interceptor Ditches <br />Orainege Araa- 4.5~ Acres <br />Hydraulic Length ~ 50~ Feet <br />Equivalent Drainage Area ° 5. 4~. Acres (Fig. 7 ; TP-149) <br />Average Watershed Slope - 15 . 5 2 % <br />Weighted Watershed Runoff Curve Number = 8~ ~AMG ~ <br />l~J <br />A. Peak Rate of Discharge From Charts ES-1026, ES-1027, TP-149 <br />Rainfall Frequency = I D Years Rainfall Depth = f • ~ Inches <br />011 Fore RCN11 ° 0(ES 102_far STEEP slopes) x Slope Correction Factor IEx. 2.01 <br />X0.5 x I.00 (0.5 ds <br />02(For_~i~RCN21= 3,1 x I ~ ~O = 3.1 cis <br />Equivalent Discharge ~ ~~_ cfs (Interpolate Between 01 and 021 <br />Actual Pesk Discharge ^ Equivalent Dixharge x Actual Drainage Aree <br />Equivalent Drainage Area <br />Aetusl Pesk Oischarga 4. 2 ~ x (~~~ 1 - 3.53 a}t '* <br />5,46 <br /> <br />Note: Ot and 0~ above refer to runoff resulting from RCN's to nearest 6 (60, 65, 70, etc.) <br />If oompuCsd RCN ends in 0 or 5 (60, 65, 70, ate.) , 02 and the next line will not <br />W needed. In this case, Ot runoff will be the equivalent Discharge. Refer to <br />SCS•TP-149 and Engineering Field Manual, Chapter 2. <br />Type I Storm distribution ES•1028: Hawaii, Alaska coastal tide of Sierra Nevada <br />and Gseada Mountains in California, Oregon and Washington. <br />T pe II Storm distribution S•1027: rest of United Statef, Puerto Rico, and <br />the Virgin Islands. <br />~ THIS t5 THE MAX~MUf"~ D15GHAR6E AT At~l`( 16~~ <br />DIAMETER `DITGN RELIC-f=~ GCJLVERT, <br />SEE ~iA-f's s6-6~ <br />To•sD <br />