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Summary Table l.--Short- and long-term impacts resulting from alternatives' Resource Irre- versible impact Irre- trievable impact Relationship of short-term use of environmental and long-term productivity Streamflows No No ,Streamflows in the Gunnison River would be reduced by diversions to proposed development. Streamflows in Uncompahgre River would be increased. Largest decreases and increases occur during the winter ~onths. Irrigation NO No Water supplies to.irrigated lands would not be affected. Development would be operated to provide required demands to irrigation system before meeting hydropower demands. River mechanics Yes No Without mitigation, development would increase bank erosion along the Uncompahgre River downstream from proposed tailrace. Water temperature No NO Periodic ice acccumulation would occur during severely cold periods. During summer months, water temperatures 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. Water quality NO NO Water quality in the Uncompahgre River would improve below proposed tailrace. Water quality would degrade in the Uncompahgre River between the South Canal and tailrace. Water quality in the Gunnison River would degrade .downstream of Smith Fork confluence. Fisheries NO No Significant impacts to Gunnison River fishery would not occur. Uncompahgre River fishery below the tailrace would improve as result of increased flows. · An irreversible impact to a resource is one that cannot be changed once it occurs; an irretrievable impact means that the resource cannot be recovered or reused. s - 12