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I ~I I I I I I I I 'liIi I I I I I I I IT' I I \,'_.'.'..,,';;..,-,:' "~:'::.;tF;,;~;'>';' .. l;liIlli~a1~'Ji'io:n~CUr,Y&~igt",othjs;,ga~gl;!;;ar.e.;sh6wri':i i1 cFigu're 2.3', and mean monthly flow data at the gauge are presented in Appendix A. 2.2.2 Uncompahgre River The Uncompahgre River is a major tributary of the Gunnison River. It originates in the San Juan Mountains to the south of the study area, and flows in a northerly direction where it joins the Gunnison River near Delta. The total drainage area of the river is approximately 1,129 square miles. Near Colona, a small town upstream of the South Canal terminus, the drainage area is about 443 square miles. As with the Gunnison, flows in the Uncompahgre River are seasonal, with high flows occurring during the late spring and early summer months. As with the Gunnison River, it was necessary for purposes of this study to assume that the Dallas Creek Unit (Ridgway Dam) was in place and operating over the period of study., Reclamation provided simulated mean monthly flows at the Colona gauge which were generated from reservoir operation studies of Ridgway Dam. These data were used without change for this report and are summarized as a flow duration curve in Figure 2.4. Appendix A presents a summary of the simulated mean monthly flows passing Colona. These values can be compared to the historically-recorded mean monthly flows at the USGS gauge, which are also shown in Appendix ,A. River flows are heavily used for irrigation purposes, and several diversions occur upstream and within the study area for systems other than UVRP canals. Table 2.3 summarizes these diversions and lists the assumed diversions occurring throughout the irrigation season. The diversion pattern assumes the same pattern as that shown for the South Canal. , Table 2.3 Non-UVWUA demands and assumed diversion patterns, in cfs, between Colona and Selig Canal Between Colona & South Canal (UP1)- Ouray Ditch' Reservation Ditch ,Between South & Se Ii 9 Cana I (UP2) Va I Verde Ditch Woodgate-Calloway Ditch Rice Ditch Stark-Volkmann Ditch Bun ock P I ant Location Assumed diversion pattern May Jun Jul Aug Sep Apr ------------------------------------------------------------- UP1 UP2 5 8 23 33 28 41 30 43 30 43 15 21 It should be noted that the Bullock Plant, a small generating, station owned by the Colorado Ute Electric Association, has been closed for several years. However, it was included in Table 2.3 because the water right has not been abandoned. The assumed diversion patterns shown in the table do not include any diversions to this'plant. If the plant were to ,resume operations, flows would be provided to meet the Bullock water rights. - 2.9 -