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voi, Q-a <br />~ T„b 3J z <br />SEDCAD+ CULVERT SIZING UTILITY , <br />Culvert D-t-A <br />Design Dischazge = 13.800.cfs <br />Entrance Loss Coefficient = 0.9 <br />Pipe Length = 50.000 feet <br />Pipe Slope = 0.900 <br />Manning's n = 0.015 <br />Maximum Headwater = 2.500 feet <br />Tailwater Depth = 1.110 feet <br />iii iiiiiiiuiiu iii <br />999 <br />Smallest Diameter Required to Pass Flow is 24 inches <br />~~ <br /> <br />1, MICHAEL W. LUDLOW, A REGISTERED PROFESSIONAL ENGINEER IN THE <br />STATE OF COLORADO, DO HEREBY CERTIFY THAT THE CULVERT DESIGN <br />CALCULATIONS FOR TWENTMILE COAL COMPANY, CULVERTS D-I-A, D-1-B, <br />AND D-I-D (EXHIBIT 8, PAGES 206, 207, AND 208), ARE TRUE AND CORRECT <br />TO THE BEST OF MY KNOWLEDGE AND BELIEF BASED UPON MY INQUIRY <br />OF THE PERSON RESPOItlSdBitiu~ifaR COMPLETING THE DESIGN. <br />MICHAEL W. I <br />P.E. N0.24046 <br />TAB 3.12, PG 1 <br />d~ 36 ~'C <br />DATE <br />Permit Renewal No. 3 <br />F(1RMFR1 V r~~ n Ana IlIV99 <br />