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Carbon Junction Mine <br />Pill Underdrain <br />Calculatiqn Sheet 2 of 4 <br />Maximum Sandetane Discharge (Q_) <br />~- <br />Vv a CWm)'S (i).54 (1 ft/12 in) <br />s (32 in/sec) (.250) (1 ft/12 in) <br />_ .667 ft/sec <br />Qs (cross'sectional area of sandstone placement) (Vv) (nss)/100X <br />_ (200 ft2) (.667 ft/sec) (10X)/100X <br />= 13.34 cfs or 1,152,500 ft3/day <br />Maximum Total Underdrain Discharge Q <br />Q ~ QT + QS <br />= 13.84 cfs or over 1,195,000 ft3/day <br />Maximum Infiltration from Precipitation Events <br />10 year 24 hour Event ~ 2.2" <br />from runoff calculations for Sediment Pond R2 (11/5/82), maximum <br />infiltration for the 46.3 acre drainage area is 1.64". Assuming <br />equal distribution of this event over the 46.3 acres, the volume <br />of infiltration from this event is: <br />I10 (1.64") (1'/12") (46.3 ac) (43,560 ft2/1 ac) <br />= 275,633 ft3 or 275,600 ft3 <br />