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implemented or considered for other federal or state actions or programs such as the <br />Escalante-Dominguez National Conservation Area and on-going and potential endangered <br />species programs could affect the legal availability of water at the diversion proposed in <br />the Clay Report. <br />• No losses were included in the studies to date between the canal headgate and the <br />reservoir. While the reservoir operations are probably insensitive to this simplification <br />during years they fill, they could be affected during the critical period, with a resulting <br />reduction in yield of several percentage points. Any future, more detailed studies should <br />address this specifically not only in relation to estimates of reservoir yield, but also in <br />relation to effects on Gunnison River flows downstream of the diversion. <br />• The evaporation rates in the spreadsheets were taken from the CDSS model. The tables <br />that represent evaporation at Vega Reservoir and at the small reservoirs on the Grand <br />Mesa were adopted for this analysis. The rates may be low, given the difference in <br />elevation between Grand Valley Lake and Vega, for instance. At this level of analysis, <br />however, they were considered adequate until more effort can be devoted to obtaining site- <br />specific estimates of evaporation. <br />46 <br />AECOM <br />2/22/10 <br />