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<br />1-:--. <br /> <br />, <br /> <br />Water allocations <br /> <br />Total <br /> <br />57,000 a.f. <br />8,800 <br />65,800 a.f. <br />46,000 a. f. <br />3.5 mg/l <br /> <br />Municipal and industrial <br /> <br />Irrigation <br /> <br />Annual depletion of the Colorado River <br /> <br />Annual salinity increase to Colorado <br />River at Imperial Dam <br /> <br />Benefit-cost ratio~ <br /> <br />2.04 to 1 <br /> <br />Total annual benefits <br /> <br />$7,251,000 <br /> <br />Environmental Impact <br /> <br />1. Temporary disturbance of water quality during construction. <br /> <br />2. Use of project water will deplete the flows of the Colorado <br />River by 46,000 acre-feet and result in 3.5 mg/l of additional salinity <br />at Imperial Dam. There will be a decrease in salinity of 1.2 mg/l due <br />to salt loading and an increase of 4.7 mg/l due to stream depletion. <br /> <br />3. Fishery quality of the Uncompahgre River will be increased <br />by including a variable outlet in Ridgway Dam for temperature control <br />of water released and by providing minimum flows substantially in excess <br />of what has historically occurred in 11 of 12 months during the year. <br /> <br />4. Significant secondary impacts will result from sale of <br />water to a proposed urban development on Log Hill Mesa. <br /> <br />5. Secondary impacts will occur if project water is made <br />available for a coal-fired thermoelectric generating station; such as, <br />air, water, and esthetic quality degradation. Depending on methods of <br />coal extraction, some impact on big game winter habitat could occur. <br />Effects of project development on big game habitat is of some concern <br />and is being studied. <br /> <br />6. Minor impacts on esthetics inhibiting big game movement <br />and reduced stream flows as they affect fisheries are expected to be <br />resolved. <br /> <br />-3- <br />