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NORTH DECLINE CHANNEL <br />REESTABLISHMENT CALCULATIONS <br />REFERENCE: Trihydro, Ver. 2.2, 1986, Western Water Consultants, Sheridan, WY <br />North Decline Drainage Channel Flow Calculations, 100 -year, 24-hour event <br />Powderhorn Coal Company <br />- 0 <br />F_I <br />L <br />BASIN CHARACTERISTICS <br />DRAINAGE AREA (SQ. MI.) . . . . . . . . . <br />. . . = 2.055 <br />STREAM LENGTH (MI.) . . . . . . . . . <br />. . . = 3.655 <br />ELEVATION DIFFERENCE (FT.) . . . . . . . . <br />. . . = 1940.000 <br />RUNOFF CURVE NUMBER, CN . . . . . <br />. . . = 78.000 <br />MINIMUM INFILTRATION IHSS (IN./HR.) . . . . <br />. . . = 0.150 <br />PRECIPITATION FOR SPECIFIED STORM <br />ADJUSTED PRECIPITATION FOR SELECTED STORM (IN.) <br />UNIT HYDROGRAPH PARAMETERS <br />UNADJUSTED TIME OF CONCENTRATION (HR.) . . . . . _ <br />ADJUSTED TIME OF CONCENTRATION (HR.) . . . . . . _ <br />DURATION OF EXCESS RAINFALL, D (HR.) . . . . . . _ <br />TIMETO PEAK (HR.) . . . . . . . . . . . . . . _ <br />BASE TIME (HR.). . . . . . . . . . . . . . . . _ <br />QPEAK (PEAK FLOWIN CFS FOR UNIT HYDROGRAPH). . _ <br />RESULTANT HYDROGRAPH VALUES <br />PEAK DISCHARGE (CFS) . . . . . . . . . . . . _ <br />RUNOFF VOLUME (ACRE-FEET) . . . . . . . . . . . . _ <br />TIME TO PEAK DISCHARGE (HR) . . . . . . . . . . . _ <br />USED SCS TYPE II 24-HOUR GENERAL STORM <br />NDEC - 10 <br />2.20 <br />0.63 <br />0.68 <br />0.09 <br />0.45 <br />1.21 <br />2195.2 <br />467.73 <br />32.04 <br />12.46 <br />(New 2-26-92) <br />