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<br />1\' <br />~ <br />~ <br />..... <br /> <br />, <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />3 <br /> <br />WATER USES AND HYDROLOGIC CONDITIONS <br /> <br />Surface Water Use <br /> <br />At present, streams and rivers are essentially the only water <br /> <br />supply source used for Upper Basin activities. Groundwater is used <br /> <br />very little. <br /> <br />Navajo, Flaming Gorge, the Curecanti Unit (Blue Mesa, Morrow Point, <br /> <br />and Crystal), and Lake Powell reservoirs makes up the Colorado River <br /> <br />Storage Project (CRSP). The latter three (Flaming Gorge, Curecanti, and <br /> <br />Lake Powell) are generally referred to as the Upper Basin's "main stem" <br /> <br />reservoirs. A major function of these main stem reservoirs is to regulate <br /> <br />flows so that the Upper Division States (Colorado, New Mexico, Utah, <br /> <br />Arizona, and Wyoming) may consume their compact entitlements yet meet their <br /> <br />obligation to deliver specified amounts of water at Lee Ferry. <br /> <br />Of the over 30 major reservoirs in the Upper Basin with a maximum live <br /> <br />storage of 34.5 million acre-feet (maf), the main stem reservoirs themselves <br /> <br />account for 29.7 maf, with Lake Powell alone accounting for 25 maf. <br /> <br />Depletions from in-basin consumption and out-of-basin exports <br /> <br />average about 3.12 million acre-feet (maf) per year under present (1975- <br /> <br />1976) conditions of development (Table 3.1). This excludes evaporation <br /> <br />from the CRSP reservoirs. Agriculture accounts for nearly 70 percent of <br /> <br />this amount (Figure 5). Upper Basin exports account for slightly less <br /> <br />than 25 percent, with the balance distributed among the remaining users. <br /> <br />3-1 <br />