Laserfiche WebLink
acre-feet) was delivered to the City of Montrose. Treated water deliveries have doubled <br />in the last 4 years. <br />A portion of the Project 7 supply is delivered from the City of Montrose's 13 percent <br />ownership interest in the Cimarron Canal. During the irrigation season, this canal diverts <br />water out of Cimarron Creek, a tributary of the Gunnison River near Blue Mesa <br />Reservoir, and delivers it to Montrose Reservoir near Cerro Summit. Typically this right <br />will yield from 500 to 1,800 acre-feet per year. Note that Montrose's entitlement to <br />Cimarron Creek water does not include storage releases from Silver Jack Reservoir, a <br />component of the Bostwick Park Project. The Cimarron rights are discussed in more <br />detail in Section 2.2. <br />2.3.3. Ridgway Reservoir Exchange Agreement <br />TCWCD owns the water storage rights in Ridgway Reservoir, as described above. Each <br />of the six water users contract with the TCWCD for municipal and industrial water from <br />the reservoir. In order for Ridgway water to be deliverable to the Project 7 treatment <br />facility, the TCWCD negotiated the Ridgway Exchange Agreement (June 1991) with the <br />UVWUA and the United States. Pursuant to this exchange agreement, high-quality water <br />imported to the Uncompahgre Valley by the UVWUA via the Gunnison Tunnel is <br />delivered through the South Canal to Fairview Reservoir for use by Project 7. <br />Concurrently, and on an acre-foot for acre-foot basis, TCWCD credits a like amount of <br />water in Ridgway Reservoir in an "exchange account" for the benefit of the UVWUA, <br />where it is available for subsequent release and use for irrigation purposes. The result of <br />the exchange is to effectively exchange high-quality water imported from the Gunnison <br />River for lesser-quality water in the Uncompahgre River, while at the same time making <br />physical deliveries of domestic water to the water treatment facility possible. Under the <br />terms of the Exchange Agreement, the UVWUA is entitled to accrue credits of up to <br />23,000 acre-feet annually, but is limited to no more than 15,000 acre-feet of capacity in <br />Ridgway Reservoir (to accommodate the exchange credits) at any one time. <br />2.3.4. Key Assumptions Incorporated into the WRPM <br />The following describes the key assumptions used in the CRDSS water resources <br />planning model to simulate the operation of Ridgway Reservoir, Project 7, and the <br />Ridgway Exchange. <br />• Project 7 demand was developed from annual delivery figures for 1980-1981, <br />supplied by Project 7. Annual demand for 1975-1979 was set to the average annual <br />value for 1980-1986. The entire data set was not used to estimate the early years of <br />the study period because the demand appeared to change significantly in about 1987. <br />The following monthly factors were used to distribute annual values to monthly: <br />Oct Nov Dec Jan Feb Mar Apr May Jun Jul Aug Sep <br />.08 .06 .06 .06 .06 .06 .06 .085 .11 .15 .13 .085 <br />Gunnison River Basin Information 2-8 <br />