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<br />Effective: precipitation was determined in order to compute the net lake evaporation. Effective <br />precipitation was computed as 70% of the total precipitation. Effective precipitation was then <br />subtracted from the gross evaporation to obtain the net evaporation. An adjustment is also made <br />for the rnonths of January and February when the water surface is typically frozen. The net <br />annual evaporation from a lake surface at the subject site is 2.34 fr (28.1 inches). <br />Consegwently the ne[ annual evaporation during mining from 2.1 acres of water surface will be <br />4.9 acre-feet. <br />There will be excavation and sale of material from the amendment property. ]t is anticipated that <br />a maximum of 400,000 tons of material will be mined and washed from the amendment area. <br />Assuming a 4% moisture wntent by weight this would equate to 11.8 acre-feet per year. <br />Water use also includes water applied for dust control. The quantity of water needed for dust <br />control during mining of the amendment area should be very similaz to what is being required <br />now in tFie original permit area; 4.9 acre-feet annually. <br />The total annual consumptive use for the amendment operation during mining is projected as <br />follows: <br />Evaporation 4.9 acre-feet <br />1Vloisture Retained in Material 11.8 acre-feet <br />Dust Control 4.9 acre-feet <br /> <br />Total 21.6 acre-feet <br />Water Rights <br />The landowner of the amendment area, Donald J. Sherwood, will be providing the necessary <br />water rights for the operation. See Exhibit O in the lease agreement which shows contractual <br />obligation to provide augmentation water. The landowner owns several senior water rights which <br />can be used for this project. The water rights include interest in the Plumb & Dailey Ditch and <br />the Coffin & Davis Ditch and shares of both Leggett Ditch and Reservoir Company and the <br />Bonus Ditch Company. <br />An analysis was done to determine the approximate annual consumptive use of each of the water <br />rights based on the diversion records for each and the landowner's proportionate share of <br />ownership. The attached Table No. 1 is a listing of the decrees for each water right and the <br />estimated consumptive use. This C.U. far exceeds the water usage proposed for the property. <br />For the purpose of calculating the average annual consumptive use of each water right a 50 <br />percent irrigation efficiency was assumed. As shown on Table No.2 the landowner owns more <br />than 550 acre-feet of consumptive use from the subject water rights. This C.U. faz exceeds the <br />water usage proposed for the property. <br /> <br />8 <br />