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• APPENDIX 2.05.3-8A (Continued) <br />Sedimentation Pond No. 2 (Upper Pond) <br />"As-Built" Desi <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 11.0 cfs - Total flow 0.80 acre feet <br />25-year, 24-hour runoff 20.9 cfs - Total flow 1.52 acre feet <br />100-year, 24-hour runoff 29.7 cfs - Tatal flow 2.35 acre feet <br />Soil Conservation Service Curve Number 75 <br />Drainage Area 48.2 acres <br />Vegetative Type - Grassland <br />Principal Spillway Capacity <br />Drop Structure 36-inch - capacity 28 cfs <br />Drop Structure Embankment Discharge Pipe = 18-inch CMP <br />Capacity with Head approximately 22 cfs <br />Emergency Spillway Design <br />• Trapezoidal <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 />Spillway Flow Characteristics 100-year storm <br />Peak Flow 30 cfs <br />Depth of Flow .790 feet <br />Flow-Y elocity 3.3 fps slope @ 1 percent <br />Embankment Height 9 feet <br />Embankment Width 15 feet <br />Embankment Length 280 feet <br />Impoundment Storage Capacity 1.1 acre feet <br />Impoundment Sediment Storage Capacity, See Map 13 <br />Topsoil Depth 6 inches <br />Vegetative Type - Grass <br /> <br />- 266 - (Rev. 5/86) <br />