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APPENDIX 2.05.3-8A (Continued) <br />• <br />Sedimentation Pond No. 1 (Lower 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 9.6 cfs - Total flow 0.72 acre feet <br />25-year, 24-hour runoff 18.2 cfs - Tatal flow 1.36 acre feet <br />100-year, 24-hour runoff 25.9 cfs - Total flow 1.9 acre feet <br />Soil Conservation Service Curve Number 75 <br />Drainage Area 43.1 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 SpiTlwa~y 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 75 feet <br />Spillway Flow Characteristics 100-year storm <br />Peak Fiow 26 cfs <br />Depth of Flow .727 feet <br />Flow Velocity 3.12 fps slope @ 1 percent <br />Embankment Height 9 feet <br />Embankment Width 180 feet <br />Impoundment Storage Capacity 1.0 acre feet <br />Impoundment Sediment Storage Capacity, See Map 14 <br />Topsoil .Depth 6 inches <br />Vegetative Type -Grass <br /> <br />- 264 - (Rev. 5/86) <br />