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• <br />APPENDIX 2.05.3-8A (Continued) <br />Sedimentation Pond 2 (Upper Impoundment) <br />L~ <br />• <br />Design Criteria <br />Capable of containing and treating the peak flow from the 10-year, 24-hour <br />storm event and capable of conveying the, peak flow from the 25-year, 24-hour <br />storm event through the combination of the principal and emergency spillway. <br />Design Criteria <br />10-year, 24-hour storm event, 1.6 inches <br />25-year, 24-hour storm event, 2.0 inches <br />100-year, 24-hour storm event, 2.3 inches <br />10-year, 24-hour runoff 10.1 cfs - Total <br />25-year, 24-hour runoff 19.1 cfs - Total <br />100-year, 24-hour runoff 29.7 cfs - Total <br />Soil Conservation Service Curve Number 75 <br />Drainage Area 47.9 acres <br />Vegetative Type -Grassland <br />Principal Spillway Capacity <br />Emergency Spillway Design <br />Trapezoidal <br />flow 0.80 acre feet <br />flow 1.22 acre feet <br />flow 1.73 acre feet <br />'Spillway Depth 2.0 feet <br />Spillway Width 10 feet <br />Spillway Sideslopes 2:1 <br />Riprap D-50 = 6 inches <br />Riprap Channel Length 20 feet <br />Embankment Height 9 feet <br />Embankment Width 15 feet <br />Embankment Length 130 feet <br />Impoundment Storage Capacity 0.80 acre feet <br />Topsoil Depth 6 inches <br />Vegetative Type -Grass <br />- 265 - <br />(Rev. 5/86) <br />