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. . . Plan Formulation Mancos Valley Salinity Study Alternative plans were developed to display a range of possible treatments to the irrigated lands and delivery systems in the Valley. Thirty-four irrigation systems were evaluated separately. Plan 1 - Future Without Program This alternative assumes that no salinity control program will be implemented in the MancDs Valley. Other programs will continue as they have operated in the past. This alternative is the bench mark that the effects of other alternatives plan are measured from. Plan 2 - On-Farm Treatment This alternative assumes that a sprinkler system will be installed under the following systems: Beaver, Boss, Carpenter and Mitchel. Doerfer, Exon, Frank, Glasgow and Brewer, Henry Bolen, Mathews, No.6, Ratliff and Root, Sheek, Smith,Webber, Willden and Brinkerhoff, and Willis Ditches. Of the 5,554 acres irrigated from these systems, on estimated 3,216 acres would be converted to sprinklers. No treatment is recommended for other areas in the valley. Cost of pumping was included in this alternative. Plan 3 - Ditch Lining Only This alternative assumes the delivery systems would be put into pipelines in the ditch systems where this treatment is eCDnomically feasible. The present ditch alignment would be used and gravity pressure would not be saved. The following systems are included in this alternative: Beaver, Boss, Frank, Henry Bolen, and Willis. No on-farm treatment was included in this alternative. ~lan 4 - Combined System This alternative assumes that the following fifteen systems: Beaver, Boss, Carpenter and Mitchel, Doerfer, Exon, Frank, Glosgow and Brewer, Henry Bolen, Mathews, No.6, Ratliff and Root, Sheek, Smith, Webber, and Willis would be combined. A pressure pipeline would supply water to the 5,467 acres under this systems. New sprinklers would be installed on 3,167 acres. Gravity pressure will be supplied to all but about 100 acres under the pipe system. 002295