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<br />CHAPTER 2 <br /> <br />ALTERNATIVES INCLUDING <br />PROPOSED ACTION <br /> <br />Table 2.1.-- Estimated supplies and historical <br />demands for the Uncompahgre Valley Reclamation Project <br /> <br />Location <br /> <br />Mean annual volume <br />(acre-feet) <br /> <br />Water available to system' <br />Diverted from Gunnison through Tunnel <br />Uncompahgre River at Colona <br />Total supplies <br /> <br />Water diverted for irrigation' <br />AB Lateral (existing conditions) <br />Cedar Creek wasteway <br />West Canal <br />Other South Canal laterals <br />Non-UVRP demands above South Canal' <br />Montrose & Delta Canal <br />Non-UVRP demands below South Canal' <br />Loutzenhizer Canal <br />Selig Canal <br />Ironstone Canal <br />East Canal <br />Garnet Canal <br />Total diversion demands <br /> <br />336,411 <br />168,685 <br />505,096 <br /> <br />18,112 <br />11,077 <br />49,177 <br />22,453 <br />10,955 <br />163,326 <br />11,482 <br />42,925 <br />60,081 <br />102,309 <br />45,868 <br />21,307 <br />559,072 <br /> <br />'Source: Reclamation simulation models for <br />Gunnison Rivers. <br />'Source: UVWUA historical records of daily <br />'Source: See chapter 3 for description. <br /> <br />Uncompahgre and <br /> <br />diversions. <br /> <br />downstream water rights, the Bureau of Reclamation (Reclamation) <br />has controlled releases from Blue Mesa Dam to meet irrigation <br />demands at the Tunnel as well as to allow a minimum instream flow <br />of 200 ft'/s. In recent years the goal has been increased to <br />300 ft'/s when available. <br /> <br />The cornerstone of the UVRP is the Gunnison Tunnel, which is <br />5.8 miles long and crosses under the hydrologic divide between <br />the Gunnison and Uncompahgre River basins. Tunnel dimensions <br />vary throughout its length; it was designed to have a rectangular <br />section 11 feet wide and 12 feet high with an arched roof, having <br />a slope of approximately 10 feet per mile. In some sections, the <br />Tunnel is completely lined with reinforced concrete, whereas in <br />others only the tunnel floor is lined. In the unlined portions, <br />the tunnel floor is relatively smooth, but occasional rock <br /> <br />2 - 4 <br />