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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 />Location: Basin 6 and Basin 7 are Evaluated Together since both drain to Sump 6 <br />1. Runoff curve number (Cn) <br />Cover description CN Soil Type Area <br />Forest 79 C&D 2.16 Acres <br />Disturbed Road 87 C 0.150 Acres <br />CN (weighted): 80 <br />2. Runoff <br />Frequency 10 yr <br />Rainfall, P (24-hour) : 1.6 in <br />Runoff, Q 0.3215 in <br />Runoff Volume 0.0619 Acre -Ft <br />Time of Concentration Tc = 0.03 <br />Storm Type• = II <br />Pond and swamp areas spread <br />throughout watershed = 0.00 percent 0.0000 Acres <br />Peak flow cfs = 1.137 <br />Sump 6 will have approximate dimensions of 30 ft x 18 feet with a depth of 5.0 <br />feet. A 2' tall berm will be placed on the downhill side. The berm will have <br />2H:1V sideslopes. <br />Each sump will have the required volume below the emergency spillway, reflecting the volume to <br />store the 10 year 6 hour event. Since the areas are so constrained on the steep slopes on site, further <br />detail on the sumps is not possible. The sump spillways will be able to pass the following 100 -yr 6 - <br />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 />The Pride of America DRMS 112c <br />Exhibit G - 7 12/23/15 <br />