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<br /> <br />I-" <br />00 <br />~ <br />en <br /> <br />some kind of water transfer from the north to the south, although there <br />must also be local adjustments to meet growing M&I uses. In its present <br />form, the Central Utah Project is partially addressed to thisproblem. <br />(Water will be released from Strawberry Reservoir in the Colorado Basin <br />and passed through a series of canals, aqueducts, and pumping plants to <br />the lands lying south of Utah Lake and into the Lower Sevier River Basin). <br />Much of the water supply which is available to the Wasatch Front area <br />(Bear River, Weber River, Provo and Jordan Rivers, and streams on the south <br />slope of the Uintas in the Colorado Basin) could conceivably be made avail- <br />able through a system of exchanges and transfers to areas in the southern <br />part of the state. The quantities which will be diverted to these areas <br />will be determined on economic, legal and social grounds, and will naturally <br />have some effect on the timing and state-wide value of a desalting plant on <br />the Wasatch Front. <br /> <br />The present total average water supply of the Wasatch Front is es- <br />timated to be about 3,000,000 acre-feet annually. This value was obtained <br />from the aforementioned water budget studies. With the control works now <br />available, the present dependable supply as determined from streamflow re- <br />cords and analyses of existing water supply systems is about 1,700,000 <br />acre-feet annually, or 57 percent of the potential. Figure 7-2 shows these <br />two values as straight lines. The figure also shows the estimated increases <br />with time for both irrigation and M&I diversions and consumptive use. About <br />1970, the required diversion curve will cross the dependable supply curve, <br />indicating that beyond this time on an overall basis reuse or an increase <br />in the dependable supply is required if the demands are to be met. The <br />dependable supply can be increased by further local development or by <br />imports into the basin. In 1995, the consumptive use curve will cross the <br />dependable supply curve, indicating that beyond this time further demands <br />cannot be satisfied without some increase in the dependable supply, re- <br />gardless of the degree of efficiency attained. <br /> <br />The difference between the present dependable supply line and the <br />projected diversion requirement for irrigation and M&I gives an indication <br />of the magnitude of the increase in effective supply required in the Wasatch <br />Front. This difference shows an increased need of appraximately 160,000 <br />acre-feet in 1980, 590,000 acre-feet in 2000, and 940,000 acre-feet by the <br />year 2020. In addition, water diversions to the marshland estimated 797,000 <br />acre-feet must be met. This is expected to come principally from reuse. <br /> <br />Opportunities for Increasing the Effective Supply <br /> <br />Remembering that there will exist competition for water from other <br />areas of the state, there are four major sources of water avi1ab1e to the <br />Wasatch Front: (1) Local surface supplies (the Bear River, Weber River, <br />Jordan River, and mountain streams east of Salt Lake City, etc.), (2) ground- <br />water, (3) the Colorado Basin (Strawberry River, Duchesne River, and south <br />slope of the Uintas), and (4) reclamation and/or reuse of return flows. <br /> <br />-26- <br />