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The 330 acre-feet of domestic water will primarily be used for individual homes using septic and <br /> leach fields, the normal depletion is 20% of the amount diverted, for a total depletion of 66 acre- <br /> feet. <br /> The surface evaporation from increased use of the inlet and delivery ditches are estimated to be: <br /> (A) Inlet Ditch - Due to the priority of the Red Mesa water rights, diversions are only allowed <br /> from about November 1 through May 1, months of no evaporation. A review of the hydrologic <br /> simulation model showed that the inflow ditch, at best, was used until May 1 and normally ends <br /> in early April. Assuming: (1) the ditch is operated 2 weeks into April on the average that was <br /> not diverted historically, which isn't totally accurate, and (2) that the water surface is 12 feet <br /> wide for 1.5 miles which is 2.2 acres; then the evaporation would be 0.15 feet of evaporation <br /> (half of the April evaporation) times 2.2 acres which is 0.34 acre-feet per year. <br /> (B) Delivery Ditches - There are three delivery ditches that use water from Red Mesa Reservoir: <br /> (1) the Vossburg which is about 1 mile long and 3 feet wide at the top for .36 surface acres; (2) <br /> the Revival Ditch which is about 1.7 miles long and 3 wide at the top for .62 surface acres; and <br /> (3) the Freed Ditch which is about 2.2 miles long and 5 wide at the top for 1.33 surface acres. <br /> The total is 2.31 surface acres. Assuming that these ditches run water in July and August with <br /> the enlargement and using the reservoir water surface evaporation or .92 feet for July and August <br /> the annual average evaporation is 1.7 acre-feet. <br /> The total additional ditch evaporation is about 2 acre-feet per year. <br /> The total depletion with the enlargement is estimated to be 2,193 acre-feet; 283 acre-feet for <br /> reservoir evaporation, 1,842 acre-feet for irrigation consumption, 66 acre-feet for domestic <br /> consumption, and 2 acre-feet for increased evaporation in the ditches. <br /> Net Increase in Supply and Depletion - The water irrigation water supply will increase from <br /> 2,088 acre-feet to 3,499 acre-feet, a total of 1,411 acre-feet. The domestic supply will increase <br /> from zero to 330 acre-feet. Evaporation will increase from 102 to 283 acre-feet. <br /> The depletion's associated with Red Mesa Ward Reservoir will increase from 1,202 acre-feet <br /> presently to 2,193 acre-feet, a net increase of 991 acre-feet, to enlarge the reservoir from 1,170 to <br /> 4,070 acre-feet of capacity. <br /> 31 <br />