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� <br />lGunnison Tunnel diversion demands are consistently met and Blue Mesa <br />Reservoir releases are able to maintain the target 300 cfs minimum instream <br />Iflow in the Black Canyon under Scenario 2B. <br />I6.3 SCREENING OF ALTERNATIVE PLANS <br />� The six alternative plans were screened by the Study Team and reviewed by <br />the Authority, the project sponsors, the Technical Steering Committee, and the <br />Advisory Committee. The following screening factors were used: ability to <br />-� meet target objectives; environmental effects; potential benefits; <br />institutional/ social factors; and cost. Table 6.5 presents a summary of the <br />I screening results. The relative rank ass�gned to each alternative plans is <br />presented below: <br />Plan Rank <br />Alternative 5 1 <br />Alternative 6 2 <br />Alternative 1 3 <br />Alternative 3 4 <br />Alternative 4 5 <br />Alternative 2 6 <br />I Alternative 5 was selected as the top ranked plan mainly because it meets <br />the target objectives in a balanced manner with relatively few adverse <br />environmental impacts. The two reservoirs included in this alternative would <br />Ibe able to reduce the total average annual irrigation depletion shortage in <br />the Study Area by about 60 percent. Furthermore, the hydrologic model results <br />` indicate that the reservoirs can provide releases to meet enhanced streamflow <br />� targets below each dam and would have reservoir fluctuations which would allow <br />( the development of a flatwater recreation facility at each reservoir. Both <br />reservoirs could alleviate flooding which takes place periodically. Although <br />� the No-Action scenario did not identify any M&I shortages in the study area, <br />the water that is stored for the purpose of instream flow enhancement could <br />possibly be stored under a transferred Gity of Gunnison storage decree. This <br />I <br />6-5 <br />