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1,1 SUMMARY Summary Table S-l.--Short- and long-term impacts resulting from alternatlves--AB Lateral Project Resource Irre- versible impact' Irre- trievable impact! Relationship of short-term use of environmental and long-term productivity streamflows No No Irrigation No No River mechanics Yes No Water temperature No No Water quality No No Streamflows in the Gunnison River would be reduced by diversions to proposed development. Streamflows in the Uncompahgre River would be increased. Larqest decreases and increases would occur durinq the winter months.. Water supplies to irrigated lands would not be affected. Development would be operated to provide required demands to irrigation system before meeting hydropower demands. Without mitigation, development would increase bank erosion along the Uncompahgre River downstream from the proposed tailrace. However, mitigation would help control the erosion. Gunnison River channel impacts would be less than would occur in the Cncompahqre River; however, changes presented in this FEIS to the Uncompahgre would be considered irreversible. periodic ice accumulation would occur during severely cold periods. Durinq summer months, water t~mperatures in the Gunnison River below the North Fork confluence would increase during low flow periods. Temperatures in the Uncompahgre River would decrease in the summer below the powerplant and increase in the summer through the city of Montrose. Water quality in the Uncompahgre River would improve below the proposed tailrace. Water quality would degrade in the Uncompahgre River between the South Canal and the tailrace. Water quality in the Gunnison River would degrade downstream of the Smith Fork confluence. 1 An irreversible impact to a resource is one that cannot be changed once it occurs. 2 An irretrievable impact means that the resource cannot be recovered or reused. s - 16