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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />o <br />~ <br />Cf) <br />..... <br /> <br />-37- <br /> <br />about 500,000 ha-m. This is an estimate of the sum of <br />stream base flows, phreatophyte evapotranspiration, well <br />pumpage, and subsurface water movement out of the basin. <br />This quantity does not represent a sustained yield since <br />eventual adverse effects on streamflow and phreatophyte <br />vegetation will result from long-term continued depletions. <br />Thus, the long-term reduction of groundwater inflows to the <br />streams would probably have a beneficial impact on total <br />salt loading although recreational uses and fisheries may <br />be damaged. <br />Transbasin Diversions <br />The more than 10 transmountain diversions to the <br />eastern slope of Colorado amounting to about 70,000 ha-mjyr <br />represents the largest aggregate transbasin diversion from <br />the UCRB. The Bonneville Unit of the Central Utah Project <br />follows with an expected volume of 20,500 ha-mjyr. There is <br />only one small diversion (320 ha-mjyr) into the basin from <br />the paria River near Tropic, Utah (Hedland, 1971). The <br />total out-of-basin water exports are approximately 110,000 <br />ha-mjyr. <br />At the present time, there is a diversion of 900 ha- <br />mjyr wich is expected to increase to 3,000 ha-m into Douglas <br />Creek from Wyoming tributaries of the Green River. These <br />diversions are part of the Laramie-Cheyenne water supply <br />system (USDI, BR, 1979a). <br />The Sevier River in Utah receives water from several <br />small transmountain diversions from the Colorado River <br /> <br />j.. <br />