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n <br />~~ <br />GRAND MESA COAL COMPANY <br />PEAK FLOW CALCULATIONS <br />DITCH & CULVERT DESIGN <br />NO. 1 <br />EAST <br />AREA <br />DRAINAGE AREA (ACRES) 9.50 <br />CURVE NO. 78.00 <br />STORM EVENT _YR., 24 HR. 10.00 <br />STORM EVENT in. 2.200 <br />RUNOFF 0.600 <br />WATERSHED RELIEF 200.00 <br />Lc 25 750.00 <br />Lc 50 600.00 <br />Lc 75 530.00 <br />WATERSHED SLOPE 0.23 <br />SLOPE ADJUSTMENT FACTOR 1.05 <br />LENGHT OF WATERSHED 1860.00 <br />EQUIVALENT DRAINAGB AREA 39.00 <br />PEAK FLOW cfs/in 17.50 <br />• ADJUSTED PEAK FLOW 2.69 <br />NO. 2 <br />EAST <br />AREA <br />15.38 <br />78.00 <br />10.00 <br />2.200 <br />0.600 <br />200.00 <br />320.00 <br />1130.00 <br />900.00 <br />0.18 <br />1.02 <br />1610.00 <br />31.00 <br />22.50 <br />TABLE 2.05.314)(d)-4 <br />WEST <br />ARBA <br />18.56 <br />79.00 <br />10.00 <br />2.200 <br />0.640 <br />200.00 <br />520.00 <br />1140.00 <br />1000.00 <br />0.16 <br />1.01 <br />1260.00 <br />20.50 <br />28.00 <br />UPPER <br />DIVERSION <br />DITCH <br />4.73 <br />74.00 <br />10.00 <br />2.200 <br />0.550 <br />1.05 <br />550.00 <br />10.00 <br />9.50 <br />6.83 16.39 2.59 <br />SPILLWAY DESIGN <br />NO. 1 <br />BAST <br />AREA <br />DRAINAGH AREA (ACRES) <br />CURVE N0. <br />STORM EVENT _YR., 24 HR <br />STORM EVBNT in. <br />RUNOFF <br />WATERSHED RELIEF <br />Lc 25 <br />Lc 50 <br />Lc 75 <br />WATERSHED SLOPE <br />SLOPE ADJUSTMENT FACTOR <br />LENGHT OF WATERSHED <br />EQUIVALENT DRAINAGE AREA <br />PEAK FLOW cfs/in <br />ADJUSTED PEAK FLOW <br />9.50 <br />78.00 <br />25.00 <br />2.600 <br />0.850 <br />200.00 <br />750.00 <br />.600.00 <br />530.00 <br />0.23 <br />1.05 <br />1860.00 <br />39.00 <br />17.50 <br />3.80 <br />NO. 2 <br />EAST <br />AREA <br />15.38 <br />78.00 <br />25.00 <br />2.600 <br />0.850 <br />200.00 <br />320.00 <br />1130.00 <br />900.00 <br />0.18 <br />1.02 <br />1610.00 <br />31.00 <br />22.50 <br />9.68 <br />WEST <br />AREA <br />18.56 <br />79.00 <br />25.00 <br />2.600 <br />0.900 <br />200.00 <br />520.00 <br />1140.00 <br />1000.00 <br />0.16 <br />1.01 <br />1260.00 <br />20.50 <br />28.00 <br />23.04 <br />• PEAK FLOW FOR SPILLWAY DESIGN 36.63~~'~ <br />Revised June 16, 1988 <br />