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<br />fi)i~ J3acon a~9Vtf3~LAh ~3nc SITE PREPARATION & DRAINAGE 4-SF-06 <br />erarrur~-coranssetor~ REV. 1 <br />swot urn ertr, urwr STANDARD FORM <br />RUNOFF & SEDIMENT CALCULATIONS 9/80 <br />SHT. 50F 12 <br />DETERMINATION OF SEDIMENT VOLUME, SETTLING VOLUME <br />AND TOTAL STORAGE VOLUME OF SEDIMENTATION PONDS <br />PROJECT \V'ESTf~s2ti) FUELS LESEQAC70 ~nir-rE JOB NO. UG 34C~ <br />REFVS~ AREA 'i 4 POND NO. 2P-4 <br />BV ~• I~~ N. DATE `7 • 2~ • 8y CHECKED BY DATE _ <br />6. Peak Rate of Discharge ~ Used to Design Emergency Spillway, Road Culverts and Interceptor Ditches <br />Drainage Area = 32 •'~ Acres <br />°. ~ <br />Hydraulic Length = `Z `} O 3 _ Feet ~ = 20`7 ~ <br />Equivalent Drainage Area = Sa-~ Acres (Fig. 7 ; TP-149) <br />Average Watershed Slope = ~ I - 1 % <br />Weighted Watershed Runoff Curve Number = ~(°'Z <br />A. Peak Rate of Discharge From Charts ES-1026, ES-1027, TP-149 <br /> <br />Rainfall Frequency = I ~ Years Rainfall Depth = _ I • 6 _ Inches <br />01(For ~r~ RCN1) = OIES 102-for 31~ slopes) x Slope Correction Factor (Ex. 2~0) <br />- 4S.o x 6-~5 = 42.75 cts <br />021For `/O RCN21=_7°•° x V,95 ~f'•5° cfs <br />Equivalent Discharge = '~~.45 cfs (Interpolate Between 01 and 021 <br />Actual Peak Discharge =Equivalent Discharge x Actual Drainage Area <br />Equivalent Drainage Area <br />Actual Peak Diseharae ¢~ ~4'r x ( 32'x' ) = ZL'~ cfs <br />5$.~- <br />Note: 01 and 02 above refer to runoff resulting from RCN's to nearest 5 (60, G5, 70, etc.) <br />If computed RCN ends in 0 or 5 (60, 65, 70, etc.) , 02 and the next line will not <br />be needed. In this case, 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 Caseade 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 />~1 <br />100 <br />