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<br /> <br />SUMMARY <br /> <br /><::> <br />, ::J Development Program <br />'::') <br />QO Water is the limiting factor in development of the Region, The <br />~ undeveloped supply is consumed by vegetation in shallow ground-water <br />~ areas and evaporation from terminal sinks. Development consists <br />principally of authorized imports or converting water from one use to <br />another of higher economic value. <br /> <br />To meet the projected water requirements, streamflow diversions <br />would increase from about 7.6 to 8.9 MAF, ground-water diversions from <br />about 1.0 to 1,7 MAF, and imports from 0.1 to 0,2 MAF. In addition, <br />desalting of residual flows to Great Salt Lake'or additional imports <br />of 0,1 MAF would be developed. <br /> <br />Total regulated surface-water storage would increase from 4,3 to <br />7.6 MAF. Most municipal and industrial return flows would be treated <br />to permit reuse. <br /> <br />There is adequate land to meet projected requirements, but <br />competition between uses would increase. Required watershed treatment <br />and management measures would be applied on the land, <br /> <br />Flood control development would provide an additional 1.3 MAF of <br />storage, 310 miles of levees and channels, 725,000 acres of watershed <br />treatment, and flood-plain management programs in 34 urban areas. <br /> <br />Water to maintain terminal lakes was not included as part of the <br />plan, although the economic impact of maintaining Pyramid and Walker <br />lakes is analyzed. If these lakes were to be maintained at their year- <br />end 1965 levels, and the projections met, an additional 270,000 aCre- <br />feet would be required in 2020. The upstream water development <br />outlined in the plan would accelerate the rate of decline and <br />deterioration of water quality in these lakes, <br /> <br />Implementation <br /> <br />The States are in various stages of preparing water plans. Frame- <br />work studies are being used to supplement these plans and provide a <br />base for more detailed planning. <br /> <br />Total cost of the development plan is about $9,1 billion, of which <br />$2.7 billion would be for water development, Total operation, <br />maintenance, and replacement costs would exceed $550 million annually <br />by 2020, about $140 million of this annual cost would be for water <br />development. <br /> <br />iii <br />