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<br />• <br />Project: Seneca IIW <br />ate: August 2003 <br />Prepared By: T ]xidich <br />i1e Name: run-off.xls <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 />T ical Drill Pad <br />Disturbed 10,000 1.7 91 0.99 0.91 754.9 <br />1) Run-ott based on NRCS Runoff Curve Number method: <br /> <br />P= Accumulative Precipitation <br />S= (1000/CNj-10 <br />2) CN was determined assuming the following assumptions: <br />Disturbe <br />Hydrologic Soil Group C <br />Vegetation Cover ~ None <br />CN 91 <br />Containment Ditch: <br />Dimentions: Trigular 1H:3V/ 1H1.5V, 2' deep <br />Crass-sectioal Area: 9 sq-ff <br />Length Along Countour: 100 fool <br />Volume: 900 cu-ff <br />• <br />