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<br />II <br /> <br />Plan Two _ Improved Irrigation Water Management - Minimum Level - on <br />55,900 Acres of Selected Area <br /> <br />I <br /> <br />improved irrigation water management <br />having economic feasibility based on <br />The irrigated area targeted for <br />1, 7, 9, 10, 14, 16, 22 and 23. <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />This nonstructural plan assumes <br />at the minimum level for those watersheds <br />downstream salinity and onfarm benefits. <br />improvement is 55,900 acres in Watersheds <br />Off-farm lateral lining is not included. <br /> <br />This plan can be implemented at a one-time construction cost of $5,947,000. <br />Technical assistance and administrative costs, estimated to be $1,923,000, <br />make a total installation cost of $7,140,000. The 35,000 ton reduction in <br />salt load represents an 8 percent reduction in the total salt load being de- <br />livered to the Colorado River from onfarm irrigation sources in the Lower <br />Gunnison Basin Unit. Deep percolation would be reduced by 3000 acre-feet, <br />crop consumptive use would be increased 10,000 acre-feet, and consumptive use <br />by hydrophytes and phreatophytes would be reduced 2,000 acre-feet. <br /> <br />Implementation of this plan could impact on an estimated 750 acres of wetlands <br />within the area targeted for improvement, which is about 2.5 percent of the <br />total wetlands in the Lower Gunnison Basin Unit. Full mitigation for the <br />impacted habitat, estimated to cost $3,400,000, would require upgrading 1/ (at <br />a cost of $2,000/acre) the habitat value on 1,700 acres of wetlands elsewhere <br />in the valley otherwise undisturbed by implementing this plan. <br /> <br />I <br /> <br /> <br />l/ Upgrading wildlife habitat values could consist of acquisition and applica- <br />tion of various management practices to raise habitat values above the <br />present level. Such practices may include fencing, livestock grazing <br />control, tree/shrub planting, creation of open water, revegetation by <br />direct seeding or natural regrowth, and possibly others as dictated by <br />site .and management needs. <br /> <br />IV-6 <br />