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GOFF <br />Memo <br />ENGINEERING ;- SURVEYING INC <br />Goff Engineering & Surveying, Inc. <br />126 Rock Point Drive Suite A • PO Box 97 Durango, CO 81302 <br />www.goffen ingZ eering com (970) 247 -1705 (voice) (970) 247 -1710 (fax) <br />Project: Carbon Junction Mine Re: Segment 4 Culvert - As -built capacity <br />Date: May 7, 2007 <br />To: M. Savage From: B. Duff / R. Markgraff ecA- <br />Culvert Calculator <br />HEAD- <br />Entered Data: <br />OUTLET <br />Shape ........................... <br />Circular <br />Number of Barrels ............... 2 <br />Solving for ..................... Headwater <br />Chart Number .................... 2 <br />Scale Number .................... 3 <br />Chart Description ............... <br />CORRUGATED METAL PIPE CULVERT <br />Scale Description ............... <br />PIPE PROJECTING FROM FILL <br />Overtopping ..................... <br />Off <br />Flowrate ........................ <br />345.0000 cfs <br />Manning's n ..................... <br />0.0240 <br />Roadway Elevation ............... <br />105.9000 ft <br />Inlet Elevation ................. <br />100.0000 ft <br />Outlet Elevation ................ <br />85.7000 ft <br />Diameter ........................ <br />66.0000 in <br />Length .......................... <br />90.0000 ft <br />Entrance Loss ................... <br />0.8000 <br />Tailwater ....................... <br />0.2000 ft <br />Computed Results: <br />Headwater ....................... 105.8817 ft Inlet Control <br />Slope ........................... 0.1589 fUft <br />Velocity ........................ 25.0326 fps <br />Messages: <br />Computing Inlet Control headwater. <br />Headwater: 105.8817 ft <br />DIS- <br />HEAD- <br />INLET <br />OUTLET <br />CHARGE <br />WATER <br />CONTROL <br />CONTROL <br />FLOW <br />NORMAL <br />CRITICAL <br />OUTLET <br />TAILWATER <br />Flow <br />ELEV. <br />DEPTH <br />DEPTH <br />TYPE <br />DEPTH <br />DEPTH <br />VEL. <br />DEPTH <br />VEL. <br />DEPTH <br />cfs <br />ft <br />ft <br />ft <br />in <br />in <br />fps <br />ft <br />fps <br />ft <br />250.00 <br />104.57 <br />4.57 <br />0.00 <br />NA <br />18.54 <br />37.28 <br />22.85 <br />1.54 <br />0.00 <br />0.20 <br />260.00 <br />104.71 <br />4.71 <br />0.00 <br />NA <br />18.91 <br />38.05 <br />23.11 <br />1.58 <br />0.00 <br />0.20 <br />270.00 <br />104.84 <br />4.84 <br />0.00 <br />NA <br />19.28 <br />38.81 <br />23.36 <br />1.61 <br />0.00 <br />0.20 <br />280.00 <br />104.98 <br />4.98 <br />0.00 <br />NA <br />19.65 <br />39.55 <br />23.60 <br />1.64 <br />0.00 <br />0.20 <br />290.00 <br />105.12 <br />5.12 <br />0.00 <br />NA <br />20.01 <br />40.29 <br />23.84 <br />1.67 <br />0.00 <br />0.20 <br />300.00 <br />105.26 <br />5.26 <br />0.00 <br />NA <br />20.36 <br />41.00 <br />24.07 <br />1.70 <br />0.00 <br />0.20 <br />310.00 <br />105.40 <br />5.40 <br />0.00 <br />NA <br />20.71 <br />41.71 <br />24.29 <br />1.73 <br />0.00 <br />0.20 <br />320.00 <br />105.54 <br />5.54 <br />0.00 <br />NA <br />21.06 <br />42.40 <br />24.51 <br />1.75 <br />0.00 <br />0.20 <br />