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<br /> <br />Plan Four _ 1m roved Irri ation Water Mana ement and Onfarm Ditch Linin <br />Minimum Level - on 43,800 Acres of Selected Area <br /> <br />I <br />I <br />I <br /> <br />This plan assumes implementing irrigation water management and onfarm <br />ditch lining or pipeline at the minimum level only for those watersheds having <br />economic feasibility based on total benefits. The irrigated area targeted for <br />improvement is 43,800 acres in Watersheds 1, 3, 4, 7, 8, 9, 20 and 21. <br /> <br />I <br />I <br />I <br />, <br /> <br />The onfarm portion of this plan can be implemented at a one-time construction <br />cost of $43,199,000. Technical assistance and administrative costs; estimated <br />to be $8,600,000, make a total installation cost of $51,799,000. Including <br />the 136 miles of off-farm lateral improvements adds $22,001,000 to the construction <br />cost and $4,400,000 to the cost of technical assistance and administration, <br />making a total installati~n cost of $78,200,000. <br /> <br />The 150,000 ton reduction in salt loading due to onfarm improvements represents <br />a 34 percent reduction in the total salt load being delivered to the Colorado <br />River due to irrigation. Treating off-farm laterals will reduce salt loading <br />by 55,000 tons, making a total of 205,000 tons. <br /> <br />Implementation of this plan could impact an estimated 400 acres of wetlands <br />within the area targeted for improvement, or about 1.3 percent of the total <br />wetlands in the Lower Gunnison Unit. Full mitigation for the impacted habitat, <br />estimated to cost $1,800,000, would require upgrading the habitat value on 900 <br />acres of wetlands elsewhere in the valley undisturbed by implementing this <br />plan. <br /> <br />IV-I0 <br />