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Design Volume Calculations Upper Sump I <br />Area Drainage Area (acres) 4.37 <br />Design Event 100 yr. storm <br />Design Precipitation 3.2 <br />Average CN 89 <br />Calculated S 1.23595505618 <br /> <br />Description Exposed gravel and rocky soil before <br />vegetation <br />Calculated Runoff Volume (Q) 2.08 <br />Calculated Runoff Volume (acre-ft.) 0.76 <br />Ponding Percentage 5.00 <br />Actual Runoff Volume (acre/ft.) 0.72 <br />As shown on the Hydrology Map, this sump wntains approximately 1.09 acre-feet. This sump will <br />have arip-rapped trapezoidal spillway width of 10 feet and a 0.5 foot depth to pass any overflow <br />from storms above the 100 year event. <br />TR09, TRl l (v1.0) 5-12 Revised 3/98, 8102 <br />