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Civil Software Design -- SEDCAD+ Version 3.1 <br />Copyright (C) 1987-1992. Pamela J. Schwab. All rights reserved. <br />Companyy Name: CYPRUS YAMPA VALLEY COAL <br />• Filename: E:\SEDCAD3\TCC DEH2OC User: CW BEGEJ <br />Date: 06-02-1995 Time: 08:01:07 <br />CULVERT EMD-3 ON ACCESS ROAD TO TCC DEWATERING FACILITY <br />Storm: 1.80 inches, 10 ear-24 hour, SCS Type II <br />Hydrograph convolution Interval: 0.1 hr <br />NON-POND STRUCTURE INPUT/OUTPUT TABLE <br />Jl, Bl, S1 <br />CROPLAND ON BINCO <br />Drainage Area from J1, B1, S1, SWS(s)1: 25.3 acres <br />Total Contributing Drainage Area: 25.3 acres <br />Entrance <br />Loss Maximum Pipe Pipe Manning's <br />Coefficient He(dw,ter L`nq;h Slope n Ta(lw,ter <br /> ft ft $ ft <br /> <br />0.90 3.0 30.0 5.0 0.024 0.5 <br />Minimum Pipe Diameter Required: 36.0 inches <br />(See Culvert Utility Program for full performance curves) <br />Runoff Peak <br />Volume Discharge <br />(ac-f t) (cfs) <br />IN/OUT 2.38- -27.20 <br />ki~*+Ff ttf ie vi it it YF**at it#,F iFf A#fat.t•*~F aF it tk*ak iFA*ik aF*aF *tk +F it tF ie vk it tF tk**ilt*+Fit*>•#*iF*aF*t*aF#iF*f#ir*** <br />1'llt!~-~~~ Exhibit 8a, Page 11 of 18 Revised 9/19/95 <br />