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Design Volume Calculations Upper Sump 2 <br />Area Drainage Area (acres) 3.08 <br />Design Event 100 yr. storm <br />Design Precipitation 3.2 <br />Average CN 84 <br />Calculated S 1.90476190476 <br /> <br />Description Half exposed gravel and half pinon- <br />juniper <br />Calculated Runoff Volume (~ 1.68 <br />Calculated Runoff Volume (acre-ft.) 0.43 <br />Ponding Percentage 5.00 <br />Actual Runoff Volume (acre/ft.) 0.41 <br />As shown on the Hydrology Map, this sump contains approximately 0.66 acre-feet. This sump will <br />have grip-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 5-7 Revised 3/98, 8/02 <br />