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9. . .. .~ eo 10. = 11. Programs in the Uintah Basin, Price-San Rafael rivers, Muddy Creek, and Me Elmo Creek will basically consist of on-farm and lateral linings with very little canal lining. The use of canals for winter livestock water causes substantial salt loading from several areas in the basin and contributes numerous local waterlogging and soil salinaeion problems. The barrier well network and Sublette Flat evaporation area as proposed by the USDA, Soil Conservation Service, and minimal on-farm improvements is the most cost-effective salinity program for the Big Sandy area in Wyoming. The "buy-out" alternative as proposed by some local lando,",."ers was evaluated and not found cost-effective. Ii;. 12. Collection and reverse' osmosfsd'esal.inat'ion oJ a-gricultural return flows should. be included as a viable salinity control alternative in dl irr1-" gated areas. However. 'at cut't'ent estimil-ees .'O'f downstream" danlil'ges, .. '-.,. desalination would not be implemented. 13. The by-pass alternative for the Paradox Valley was evaluated and found to be more cost-effective than the proposed Radium evaporation pond alter- native. This was primarily due to the greatly increased costs of evapor- ation ponds. 14. The proposed desalination of the Glenwood-Dotsero Springs in Colorado was evaluated in detail a. part of this study. It WaS concluded that the most eoonomical alternative was .a primary reverse osmosispl"ntfcllowed. by a much smaller secondary multi-stage flash distillation unit. How- ever, at current average damage estimates, this project is marginally feasible. t';: ~\<:, 15. The use of average costs per .mg/l of treatment .is misleading and should not be used in the delineation or phasing of salinity oontro~ projects. 16. At current average damage estimates, it is cost-effective t'o treat only about 48 to 50 percent of the total attainable salt load reduction from the projects designatad in PL 93-320. 17. All of this analysis points to the faot that the arbitra:rytarget of maintaining 1972 salinity levels at Imperial Dam cannot be cost- effeotivelyattained. In fact, these. results indicate that the target level shoul<l be increased to about 1,030 or 1,040 mg/l or more. 18. Present trends indicate that all of the cost-effective salinity oontrol programs should be on-line no later than 1995. The damage costs due to delayed construction of these projects can be substantial. 19. Sensitivity analysis of the <lata and the optimization procedure indicate that substantial error in costs and the respective salt load contribu- tions of the individual alternatives ,",~uld have to ocour to change the optimal order of implementation of a basin-wide salinity control program. & . 9 ~, lb. ... .. '.