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Location: Basin 5 <br />1. Runoff Curve Number (CN) <br />Cover description <br />Forest <br />Disturbed <br />CN Soil Group Area(Acre) <br />79 C&D 2.050 <br />87 D 0.470 <br />CN (weighted): 80.5 <br />Total Area: 2.520 Acre <br />2. Runoff <br />Return Period: 10-Year <br />Rainfall, P: 1.60 in <br />Runoff, Q: 0.3515 in <br />Runoff Volume: 0.0738 Acre-Ft <br />Time of Concentration (Tc) 0.043 hrs, 2.6 min. <br />Peak Flow 1.38 cfs <br />Sump 5 will have approximate dimensions of 25' x 26' x 5' with a 2' tall berm on <br />the downhill side. The berm will have 2H:1V sideslopes. <br />Each sump will have the required volume below the emergency spillway, reflecting the volume to store <br />the 10 year 6 hour event. Since the areas are so constrained on the steep slopes on site, further detail on <br />the sumps is not possible. <br />The sump spillways will be able to pass the following 100-yr 6-hr peak flows: <br />Sump 1: 2.88 cfs <br />Sump 2: 2.98 cfs <br />Sump 3: 0.85 cfs <br />Sump 4: 0.63 cfs <br />Sump 5: 2.72 cfs <br />The typical sump schematic is shown below: <br />Yule Quarry April 10 23