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<br />." <br /> <br />, <br />, <br /> <br />,,., -", .,..,~ <br />u 'j ,~. ,: 1-:-';) <br /> <br />, <br /> <br />SUMMARY <br /> <br />',~ <br />.~ <br /> <br />., <br /> <br />mRIGATION <br /> <br />i <br /> <br />, <br />,1 <br /> <br />Operation of the development alternatives would not affect the <br />amount of water diverted for irrigation use within the study <br />area, including private irrigation diversions as well as the <br />UVRP, The Montro,se and Delta Canal (M&D) and the LOutzenhizer <br />Canal would receive the majority of their water supply from the <br />Uncompahgre River with development, Under the no-action <br />alternative, about 59 percent of the water supplies delivered to <br />these canals would be derived from the Gunnison River, Under any <br />of the development alternatives, about 35 percent would be <br />derived from the Gunnison. Conversely, the Selig, East, <br />Ironstone, and Garnet canals would receive higher percentages of <br />Gunnison River water. Senior water rights for private irrigation <br />diversions along the Gunnison and Uncompahgre Rivers would <br />continue to be honored, ' <br /> <br />;~ <br /> <br />-': <br /> <br />'1 <br />j <br />, <br /> <br />RIVER MORPHOLOGY <br /> <br />1 <br /> <br />Without development, the Gunnison River between the North Fork <br />confluence and Delta would be expected to become narrower and <br />more stable due to the effects of existing upstream water storage <br />projects, Changes being caused by the Aspinall Unit on the <br />Gunnison River upstream from the North Fork would continue, <br /> <br />,~ <br />; <br />~ <br />" <br />,. <br /> <br />With development, more of the riverbed would be exposed. The <br />principal time that this would occur is in the nongrowing season. <br />This would limit encroachment of' riparian vegetation and wetlands <br />during periods of low and intermediate flows, Scouring during <br />high flow periods would maintain the channel. <br /> <br />i1 <br /> <br />Ii <br /> <br />~ <br /> <br />, <br />, <br />~i <br /> <br />Without dev,elopment, the Uncompahgre River upstream of the study <br />area would become a narrower and more stable river under the <br />influence oj Ridgway Reservoir. Within the study area <br />(downstream ftom the South Canal), the bank erosion that now <br />occurs would continue, and bank stabilization by individuals and <br />local governments would continue. <br /> <br />:6 <br />_Of <br /> <br />With development, bank erosion in the Uncompahgre River between <br />the South Canal and the proposed tailrace wou,ld decrease together <br />with the river's potential to scour encroaching vegetation. <br />Between the proposed tailrace and Delta, the river would become <br />more unstable and significant additional bank erosion would occur <br />unless bank protection was initiated, To reduce this erosion, <br />bank stabilization would be performed by the Spons9rs before <br />development in areas found to be most susceptible to erosion_ <br />Changes in erosion would be monitored during operations, and <br />further bank stabilization would be completed where necessary, <br /> <br />".; <br /> <br />S - 9 <br /> <br />"_ i, <br /> <br />,d' <br /> <br /><i <br />""",,,,.1,..,... <br />