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~V.:. <br />Sedimentation Control Structure for Truck Scale <br />Area of scale site: <br />Area (1) 1/2 (120') 370' = 22,200 <br />Area (2) (2) 1/2 (60) 40' = 2,400 <br />24,600 sq. ft - 43560 .56 Acrea <br />i 1.7" for a one hr. 10 year storm CSC Technical paper No. 55 <br />C = 0.25 from table 111-4 Erosion and Sediment Control EPA Technology Transfer <br />Seminar Publication <br />Q = CIA = 0.25 (1.7) (.56) = 0.238 cfs <br />peak inflow from 1 hr. 10 yr. storm <br />Volume for 1 hr. 10 yr. storm <br />0.238 cfs X 60 sec/mm X 60 min/hr = 856.8 cf <br />Volume of sediment pond required to hold a one hour 10 year event and expected <br />sediment load would be 2.5' X 15' X 30 equaling 1125 cf. Due to the almost flat <br />grades, hard surfaces, and low usage, the expected sediment yield is negligible. <br />Therefore, the excess 268cf storge volume is more than adequate for the sediment <br />loading. <br />(Rev. 1-22-82) <br />