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<br />o <br /> <br />.... <br /> <br />., I'J <br /> <br />o <br />b1e 2.9. Leaching requirement has been set at 5\ of crop evapotranspiration. <br /> <br /> <br />lis amount was 0.12 af/acre for the irrigation season. The effective' <br /> <br />Linfall of O.44af/acre is a 40-year average over the Dolores Project areas, <br /> <br /> <br />Ie frost-free period for the Towaoc area is 130 days (May 24-0ctober 2) <br /> <br />w the irrigation season 168 days (May I_October 15). Por agricultural <br /> <br /> <br />:onomic analysis, the USBR estimates a 150 day frost-free period for this <br /> <br />rea. <br /> <br />The ne~ irrigation requirement is estimated to be 2.02 af/acre for each <br />nrigable acre. Assuming a farm or unit irrigation efficiency of 65% and no <br />!divertible return flows, 3.13 af/acre is needed as a net farm delivery <br />,quirement. The total seasonal net farm delivery requirements for the 7,500 <br />, <br />nrigable acres becomes 23,475 acre-feet. <br /> <br />. <br /> <br />If water measurements are to be made at McPhee (Alternative I), 4.15 feet <br /> <br /> <br />1st be diverted for each irrigable acre or 31,125 acre-feet total for the <br /> <br />. <br />,ason. This includes 19.5% or 0.81 af/acr~ of conveyance -seepage and <br />raporation _ losses in the 42 mile reach of the Towaoc Canal. A 5% operational <br />lste is also included. If Alternative II were select~d, the net diversion <br />5quirement becomes 3.60 af/acre and the cor.veyancelosses, 0.29 af/acre or <br />~. Under this system, a total of 27,000 acre-feet must be diverted at the <br />~ian Reservation boundary. The canal losses, using the Moritz formula with <br />"C" f~ctor of 0.32 ft3/ft2/day, have been ~tilDa.ted at 6,075 acre-feet for <br />l~ernative I and 2,175 acre-feet for Alternative II. <br />The water supply requirement for t~e ;;~e Mountain Tribe is sUllDJlarized <br />1 Table 2.10 for the two alternatives. All?Ving 1,000 acre-feet of water for <br />micipal and" Industrial use, a total of 32,125 acre-feet need to be allocated <br />,r the Ute Mountain tribe- if water is mea.$.=-ed at McPhee. The water supply <br />llocation would be 28,000 acre-feet if ~~ed at the Indian Reservation <br />lundary . <br /> <br />.( <br />