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Carbon Junction Mine <br />Fill Underdrain <br />Calculation Sheet 4 of 4 <br />Average thickness of fill ~ Designed volume of fill/area of fill <br />(from Table 5-4 and Sediment Pond d2 sheets) <br />_ (2,837,000 yds3) (27 ft3/1 yd3) <br />32.7 acres) 43,560 ft acre) <br />= 53.8' use 55' <br />T = k x 55' _ (75'/day) (55') <br />= 4,125 ft2/day <br />QF = 41T1 <br />(1,300') (4,125 ft2/day) (410'/3,330') <br />= 659,587.5 ft3/day <br />Use 660,000 ft3/day <br />The discharge capacity of the underdrain exceeds the <br />discharge capacity of the saturated fill area by <br />535,000 ft3/day. <br />