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<br />APPENDIX II <br />DETAILS OF CALCULATIONS <br />• <br />A) Annual Recharge to Eastern Backfill Area <br />Area of Eastern Backfill <br />Estimated Annual Recharge Rate <br />Total Recharge = (6 x 10') (0.25) <br />B) Storage Changes in Eastern Backfill <br />Area <br />= 6 x l0~ft <br />= 0.25 ft/yr <br />= 1.5 x l0~ft /yr <br />200gpm <br />(i) Snowmelt Recharge Period <br />Assumption: All recharge for year occurs during snowmelt <br />period. <br />Length of Active Recharge Period = 60 days <br />Recharge during this period (from (A) above) = 1.5 x 10~ ft <br />Average discharge rate during this period = IOOOgpm <br />= 1.93 x lOsft/day <br />Total discharge during this period: <br />(1.93 x 105 ft /day) (60 days) = 1.16 x 10~ ft <br />Storage change during period = 3.4 x 106 ft <br />(Recharge-Discharge) <br />(ii) Rest of the Year <br />Assumption: All discharge during period derived from <br />excess storage <br />Quantity of Period <br />Length of Water in Excess Storage <br />(from i above) <br />Average discharge rate during period: <br />(3.4 x 10~ ft )/ (305 days) <br />= 305 days <br />= 3,4 x 106 ft <br />= 1.I1 x 10~ ft /day <br />= 58gpm <br />• <br />