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<br /><'1 <br /> <br />Releases from the out let works at Ridges Bas in Dam to <br />satisfy municipal and industrial demand in New Mexico would be infre- <br />quent, since most of the average annual supply would simply be bypassed <br />at the Durango Pumping Plant, as shown in Figure A-5. When there was <br />insufficient flow in the Animas River to supply nonproject and project <br />demands, downstream releases would be made from the outlet works to Basin <br />Creek. During the 49-year study period, reteases would have been made <br />for short periods of 1 to 3 months in 21 years and would have averaged <br />between 20 and 25 cfs with a maximum of 70 cfs. <br /> <br />As shown in Figure A-5, the largest demand on the storage <br />provided in Ridges Basin Reservoir would come from project users served <br />through the Dry Side Canal. Because the canal could have freezing and <br />maintenance problems during the winter months, all pumping to the canal <br />would occur from April through October. In addition, maximum canal flows <br />would be needed to satisfy peak irrigation demands in June and July. <br />Therefore, it would be necessary for the Ute Mountain Ute Indian Tribe <br />and the rural water users to provide secondary storage for the municipal <br />and industrial water delivered to them through the canal. <br /> <br />Releases to the La Plata River from the Dry Side Canal <br />would be needed to supplement the supply available for Southern Ute <br />Reservoir downstream and to replace water that would be diverted upstream <br />from the canal for supplemental irrigation under project operation. <br />Releases for one or both of these purposes would generally occur through- <br />out the summer, except during peak irrigation de.mand periOdS when the <br />entire capacity of the canal would be required to serve the seven project <br />lateral systems. Diversions to the Dry Side Canal from the La Plata <br />Diversion Dam would be intermittent, and would occur only when the <br />natural flow of the river exceeded existing downstream water rights and <br />the diversion capability to Southern Ute Reservoir downstream; or when <br />the reservoir was full. The diversion dam would have been operated <br />during 17 years of the 49-year study period. <br /> <br />c. Southern Ute Reservoir System <br /> <br />(1) Design <br /> <br />(a> Southern Ute Diveraion Dam and Inlet Canal <br /> <br />The Southern Ute Diversion Dam, which would span the <br />La Plata River, would be located 2.8 miles north of the State line and <br />would consist of a concrete overflow spillway 100 feet long, flanked by <br />two compacted earth dikes. It would form a pond of about 17 surface <br />acres with a maximum depth of 9.5 feet at the dam. About 2,400 cubic <br />yards of concrete and 16,250 cubic yards of riprap and compacted embank- <br />ment material would be placed in the river. A design drawing of the dam <br />is shown in Attachment 5. Water would be diverted from the pond to the <br />Southern Ute Inlet Canal, which would have a capacity of 375 cfs, a water <br />depth of 4.5 feet at capacity, and a concrete lining for almost its <br />entire length of 3.3 miles. Fencing would be installed to exclude <br /> <br />A-16 <br />