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• <br />• <br />Project Seneca IIW <br />ate: August 2003 <br />Prepazed By: T Leidich <br />File Name; run-oEfxls <br />Phase 6 Area Rain Fall CN S Rainfall Excess Run-Off <br /> (10-yr,24-hr) (10-yr,24-hr) <br /> (sq-ft) (in) (in) (Cu-ft) <br />ypical Drill Pad <br />Disturbed 10,000 1.7 91 0.99 0.91 754.9 <br />1) Run-off based on NRCS Runoff Curve Number method: <br />Q = (P-0.2S)^2/(PtU.BS) <br />P=Accumulative Precipitation <br />S= (1000/CN)-10 <br />2) CN was determined assuming the following assumptions: <br />Disturbed <br />Hydrologic Soil Group C <br />Vegetation Cover None <br />CN 91 <br />ontainment Ditch: <br />Dimentions: Trigular 1H;3V/ 1H1.5V, 2' deep <br />Cross-sectioal Area: 9 sq-ft <br />Length Along Countour: 10o foot <br />Votume: 900 cu-ft <br />• <br />