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Civil Software Design -- SEDCAD+ Version 3.1 Copyright (C) 1987-1992. Pamela J. Schwab. All rights reserved. Company Name: PEABODY COAL COMPANY • Filename: C:\SEDCAD3\COALCANY User: lmr Date: 12-20-1996 Time: 16:04:16 Coal Canyon Runoff and Drainage Design Storm: 1.70 inches, 20 year-24 hour, SCS Type II Hydrograph Convolution Interval: 0.1 hr ----------------------------------------- ----------------------------------------- NON-POND STRUCTURE INPUT/OUTPUT TABLE ----------------------------------------- ----------------------------------------- J2, Bl, S1 Bookcliffs to CRDA 3 Drainage Area from J2, B1, S1, SWS(s)1-3: 3465.9 acres Total Contributing Drainage Area: 7289.8 acres MATERIAL: GRADED LOAM TO COBBLES NONCOLLOIDAL Trapezoidal Earthen Channel Limiting Variable: Velocity = 5.000 fps Sediment-laden Water r~ U w/ Freeboard Design Bottom Manning's Discharge Width ZLeft ZRight Slope n (cfs) (ft) (o) ---------------------------------------------- 479.92 40.0 2.0:1 2.0:1 0.2 0.030 Top Hydraulic Froude Depth Velocity width Radius Number (ft) (fps) (ft) --2-69-_---3-93-_----50,8----__-2 349------0 45 2.99 52,0 Runoff Peak Volume Discharge (ac-ft) --- -- (cfs) ---- -- ----- ------- ----------------- IN/OUT 111.07 ----- - ------------ 479.92 *,t+:r~*,t**++++*+r+**,t*t*+*,t*+**+r,t,t~+++**+,*+++t,t++**+~*+t++*+**t,t~+*+,t**+++t,t++r J2, B2, S1 Coal Gulch Drainage Area from J2, B2, S1, SWS(s)1-2: 493.5 acres Total Contributing Drainage Area: 493.5 acres MATERIAL: Rock Riprap Trapezoidal Riprap Channel Steep Slope Design - Simons/OSM Method Design Bottom Manning's • Discharge Width ZLeft ZRight Slope n (cfs) (ft) ( o) ---------- 113.93 --------- 20.0 ---------------------- 2.0:1 2.0:1 6.6 -------- 0.035 13-1-14 (New 12/16/96)