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<br />"i <br /> <br />estimates that the annual consumptive use for agricultural purposes in Nevada is approximately <br />1 00,000 af per year.30 This consumptive use is not included in Nevada's 300,000 af of mainstem <br />apportionment, therefore the transfer of this water from agricultural to municipal use is a potential <br />source of water for Las Vegas.3l <br /> <br />Upper Basin Tribuatries <br /> <br />There are also three principal tributaries or sub-basins in the Upper Basin; the San Juan River <br />Basin, the Green River Basin and the Upper Colorado River Basin. <br /> <br />The Green River Basin: The Green River drainage includes southwestern Wyoming, <br />northeastern Utah and northwestern Colorado. The Green River drains over 44,000 square miles, an <br />area about the size of the State of Pennsylvania. The estimated natural flow ofthe Green River at its <br />confluence with the Colorado River in Canyonlands National Park is approximately 5.1 mafper <br />year. 32 <br /> <br />The Green River itself has its.headwaters in high Wind River Mountains above Pinedale, <br />Wyoming. From there it runs due south through southwestern Wyoming high desert country. It picks <br />up inflow from the western slopes of the Wind River Mountains and eastern slopes of the Wyoming <br />Range. <br /> <br />The Green River crosses into Utah in what is now Flaming Gorge Reservoir. Below Flaming <br />Gorge Dam the river turns toward the southeast and enters Colorado in what is referred to as Browns <br />Park. Before jogging back to the west to again enter Utah, the Green River picks up its largest <br />tributary, the Yampa River. The Yampa River drains approximately 6,000 square miles of northwest <br />Colorado and south central Wyoming. <br /> <br />Back in Utah, the Green is joined by its major Utah tributary, the Duschene River. The <br />Duschene River drains the southern slopes ofthe Uintah Mountains. It is the largest tributary of the <br />Colorado River system that flows from west to east. The Duschene may also be Utah's most <br />important stream. A portion of its waters are diverted to the west out of the Colorado Basin into <br />Utah's Wasatch front, primarily through the Central Utah Project (CUP).33 <br /> <br />3OU.S. Department of the Interior, Colorado River Consumptive Uses and Losses Report, 1996-2000, October 2003. See TABLES <br />LC-4 through LC-8. <br /> <br />31The Southern Nevada Water Authority has filed an application for federal rights of way. The proposed 7 state agreement addresses <br />the SNW A proposal in paragraph 8. The November 26, 2006 draft of the agreement is attached as Appendix B. <br /> <br />32 This number is the author's estimate. It is based on the Final Report of the Engineering Committee to the Upper Colorado River <br />Basin Compact Commission, dated November 29, 1948. Part II of this report includes a comprehensive table of estimated virgin <br />stream flows for 1914-1945. The Engineering Committee estimated the flow at 5.4 mafperyear. The Committee estimated in natural <br />flow afLee Ferry to be 15.7 mafper year. I use a longer term average of 14.8 mafper year which corresponds to a flow the Green <br />Riverof5.1 mafperyear. <br /> <br />33 According to the Colorado River System Consumptive Uses and Losses Reports for 1991 to 2000, prepared by the Department of <br />the Interior, Utah was exporting about 110,000 afper year on average, with a maximum of 163,000 afin 1992. <br /> <br />Page -13- <br />