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III III III IIIIIII III Doc Date:12/11/2001 <br />sss <br />`5 JE APPENDIX 2.05.3-3 <br />YAMPA RIVER SEDIMENTATION POND DESIGN <br />HAUL ROAD <br />SUN COAL COMPANY - MEADOWS N0. 1 <br />ROUTT COUNTY, COLORADO <br />Yampa Sedimentation Pond Design <br />Drainage area = 1.29 acres CN = 80 Hydrologic Group D Slope = 20$ <br />Pptlp = 1.6 PptPS = 2.0 PPt100 = 2.6 Ppt = precipitation <br />Peak Flow Calculations ~ <br />Unadjusted Peak Runoff Factor Peak Flow 3.2 cfs <br />~,.~ ~.~; <br />~ Q10 Q25 Q100 Q10 Q25 Q100 <br />~~ <br />r., .34 .56 .96 1.12 1.85 3.16 <br />Total Flow Calculations <br />Drainage Area <br />Da = 1.29 acres <br />Total Q10 = .34 = 1.29 acres x 34~~ _ .04 ac/ft -~ ,~ <br />Zen/ft <br />Total QP5 = .56" = 1.29 acres x~in/ft •06 ac/ft -` _ . <br />Total Q100 = .96" = 1.79 acres xl~in/ft •10 ac/ft <br />Design sediment pond to contain 10-year, 24-hour storm, include sediment <br />storage = .O1 ac/ft. <br />Total Volume = .05 ac/ft <br />Design 5 feet deep <br />Construct impoundment. 3:1 sideslopes <br />Triangular shape 30 feet wide x 30 feet long <br />Dewatering device must convey Q100 = 3.16 cfs <br />Install 18-inch capable to convey 5.5 cfs with CMP Project from fill - no head <br /> <br /> <br />_ ~,F _ (Rev. s/a61 <br />