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<br /> <br />w <br />~ <br />-.J <br />~~ <br /> <br />Feasibility studies would be initially performed on a total of <br /> <br />16 irrigation, point, and diffuse salinity sources with related <br /> <br />basin-wide planning involving development of a mathematical model <br /> <br />of the Colorado River, economic analysis of water quality, analysis <br /> <br />of legal and institutional matters, and the investigation of poten- <br /> <br />tials for improving water quality at points of diversion. <br /> <br />Early emphasis is being placed on those activities most likely to <br /> <br />achieve water quality improvement at least cost. Construction of a <br /> <br />mathematical model may reveal better ways to operate the river system <br /> <br />to generate water quality benefits without incurring capital invest- <br /> <br />ment costs for structural control measures. Irrigation source control, <br /> <br />involving close integration of on-farm irrigation water scheduling and <br /> <br />management, with water systems improvement and management, is expected <br /> <br />to significantly reduce salt loadings. Some measuring devices may be <br /> <br />required to implement the irrigation scheduling and management program <br /> <br />which is now being implemented. This can be expected to achieve early <br /> <br />benefits at minimal cost. <br /> <br />Folloving the full operational establishment of the irrigation sched- <br /> <br />uling activity, water users would be expected to operate the program. <br /> <br />This could be contractually tied to water systems improvements and the <br /> <br />related cost-sharing arrangements with the irrigation districts or <br /> <br />other entities involved. The irrigation schedUling and water systems <br /> <br />x <br /> <br />