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2_2 East Sumn <br /> Runoff Curve Number and Runoff <br /> Project:Eagle Rock <br /> Project: East Sump By: B Langenfeld Date: 06/28/18 <br /> Location: Tower Pit <br /> Developed <br /> 1. Runoff Curve Number(CN) <br /> Cover description CN Soil Group Area(Acre) <br /> Open Space-Fair(50%to 75%grass) 49 A 1.801 <br /> Open Space-Fair(50%to 75%grass) 69 B 9.358 <br /> Mined Land, Disturbed (Poor) 87 C 11.023 <br /> CN(weighted): 76.3 <br /> Total Area: 22.182 Acre <br /> 2. Runoff <br /> Return Period: 100 YEAR <br /> Rainfall, P: 2.51 in <br /> Runoff,Q: 0.7152 in <br /> Runoff Volume: 1.3220 Acre-Ft <br /> The area of the pit that drains to the east sump is 14.4 acres. With a two foot stormwater berm, <br /> there is 28.8 acre-ft of storage. This more than sufficient to contain the entire 1.3 acre-ft of runoff <br /> that drains to this area. <br /> Tower Pit 1 <br /> .2 <br /> 11--c►i and 15wnatr. PI.1 <br /> October 2018 G-4 <br />