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CALCULATION SHEET <br />WEST OF THE REFIISE BELT <br />Runoff volume <br />Area =0.66 Ac. <br />CN = 90 <br />10 yr. 24 hr. Storm = 2.9 inches <br />Runoff = 1.89 inches <br />1.89 inches * 0.66 acres * 1 foot/12 inches = 0.104 Ac/ft <br />Containment Area Sizing <br />0.104 Ac/ft * 43.560 ft^2 = 4,528 ft^3 <br />Acre <br />Runoff volume <br />Sediment storage <br />and Freeboard <br />TOTAL =_> <br />0.104 Ac/ft <br />0.078 Ac/ft <br />0.182 Ac/ft <br />The containment area will be triangular in shape with 60 feet wide <br />by 66 feet long with an average depth of 4.0 feet for a total area <br />of 7,920 cubic feet. If topographical conditions are not suitable <br />for this configuration the pond will be configured to hold at least <br />0.18 Ac/ft as a minimum. <br />Ditch Sizing <br />All runoff that enters this pond is from direct runoff down the <br />side slopes and from direct precipitation. Ditches are not required <br />or present for this small area eximtion. <br />