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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 />See/ion 4 - E\i.l/ing Colorado *//er S"pplie.1 <br /> <br />Seven basins are currently <br />near the limits oldepletions <br />and consumptive use. <br /> <br />"Interstate compacts require Colorado to permit speci- <br />fied quantities of water to cross its boundaries into other <br />states for downstream use. In addition to the outflows <br />required to satisfy the compacts, some flood flows which <br />cannot be managed by existing water resource develop- <br />ments also leave the state." <br /> <br />Figure 5 shows the 24 existing trans mountain diversions in the <br />state. The figure also indicates average diversions over the 1986- <br />]995 period. About 507,000 AF is diverted annually from the <br />Colorado River watershed into the South Platte River, Arkansas <br />River, and Rio Grande River Basins. <br /> <br />CWCB has estimated that the following basins are currently near <br />the limits of depletions or consumptive use on the basis of in- <br />state use or interstate compacts: <br /> <br />. Arkansas River Basin <br />. Rio Grande River Basin <br />. La Plata River Basin <br />. Republican River Basin <br />. Costilla Creek Basin <br />. North Platte River Basin <br />. Laramie River Basin <br /> <br />These cover the area shown in Figure 6. <br /> <br />The Colorado River Basin and the South Platte River Basin still <br />have the potential for additional depletions based on estimates of <br />current use under the compacts. Colorado is entitled to consump- <br />tively use up to 3.079 million acre-feet per year of Colorado River <br />Basin water under the 1970 "Criteria for Coordinated Long Range <br />Operation of Colorado River Reservoirs" and the current Hydro- <br />logic Determination for the basin. In] 985 the best estimate of <br />Colorado's average annual consumptive use of Colorado River <br />Basin water was 2.3 million acre-feet. However, summing the <br />maximum consumptive use of all projects currently in place gives <br />a value of about 2.6 million acre-feet. Thus Colorado may have <br />as little as 450,000 acre-feet left to develop under its Colorado <br />River Compact apportionment. The Colorado River Decision <br />Support System (CRDSS) is currently being developed to fur- <br />ther retine these values. <br /> <br />4-3 <br /> <br />__ ccl.oraoo <br />IT._ Farm Bureau <br />