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Implementation of the measures included in these projections will provide better control of irrigation water and will reduce seepage from existing earth ditches. The estimated effect of these measures on the water and salt budgets in the valley are shown in Table 11. These estimates are based on an average increase of 4,200 parts per million in salt concentration of the water returning to the river and on funding for cost-share assistance continuing at the average level of the past six years. Table 11 -- Annual Reductions in Seepage and Salt load Pickup Without an Accelerated Program for Implementation of Improvements I tem of Improvement Annual Increment 1/ ac. ft/yr. Seepage Maximum Annual 2/ ac. ft/yr. Salt load Pickup Annual Maximum Increment 1/ Annual 2/ tons/yr. tons/yr. Ditch Li n i ng & Pipelines 770 7,700 4,400 44,000 land Level ing & Mgt. Imprvt. 170 1,700 1,000 10,000 TOTALS 940 9,400 5,400 54,000 1/ Annual Increment of Reduction Gained from Each Year's Implementation. 2/ Maximum Annual Reduction after Completing 10-Years of Implementation. As population of the valley increases additional residential and urban land will be needed. Part of the increase is attributed to emigration of retired and semi-retired people into the valley. However, the more significant influence on population will come from development and exploitation of energy reSOurces as part of the nation's search for new supplies of energy. Currently irrigated agricultural land is being converted to residential and urban uses at the rate of about 800 acres per year. Without extensive development of oil shale it is estimated that an additional 8,800 acres 33 \.GO~