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APPENDIX 2.05.3-8A (Continued) <br />u <br />C1 <br />J <br />• <br />Sedimentation Pond No. 1 (Lower Pond) <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 9.0 cfs - Total <br />25-year, 24-hour runoff 17.1 cfs - Total <br />100-year, 24-hour runoff 24.3 cfs - Total <br />Soil Conservation Service Curve Number 75 <br />Drainage Area 38.4 acres <br />Vegetative Type - Grassland <br />Emergency Spillway Design <br />Trapezoidal <br />flow 0.65 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 180 feet <br />Topsoil Depth 6 inches <br />Vegetative Type - Grass <br />- 263 - <br />(Rev. 5/86) <br />