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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />. 0 <br /> <br />o <br /> <br />With regard to new reservoir sites, the Cactus Park site recommended in the <br />1973 USBR study was found to be the most suitable and was included in each <br />of the al terna ti ve plans, <br /> <br />o <br /> <br />The yields and costs of the three alternative plans are compared in the <br />following tabulation: <br /> <br /> Alternative I Alternative 2 Alterna ti ve 3 <br /> Surface Creek <br /> Surface Creek Storage with <br /> Storage with Leroux Creek <br /> Surface Creek Leroux Creek and Overland <br /> Storage Only Diversion Ditch Diversion <br />% Irrigation <br />Firmness* 85 90 95 85 90 95 85 90 95 <br />Project Yield <br />0,000 ac-ft) 11.3 12,2 13,0 II. 6 12,0 13.0 11,7 12,6 13.1t <br />Annual Cost <br />(million $) 2,91t 3,lt0 1t,08 2,92 3,25 3,71 2,68 2,89 3.30 <br />Annual Cost <br />Per Ac-Ft $260 $278 $311t $253 $263 $281t $228 $230 $21t6 <br />*Irrigation firmness is used in this study for measuring reliability of water supply. <br />The irrigation firmness is the percentage of irrigation months where all demands <br />will be met, <br /> <br />o <br /> <br />The success of any alternative plan for the Grand Mesa Water Supply Project <br />would depend upon voluntary cooperation among water users in the basin, <br />Sensitivity analysis was conducted to evaluate the impact of the degree of <br />water user participation. Results indicated that it would require 89 percent <br />participation of the lower basin users in order to achieve a 90 percent <br />irrigation firmness for the project. <br /> <br />The preliminary designs and cost estimates in this study are based on the <br />assumption that the great majority of irrigators in the study area would adopt <br />a water use pattern reflecting minimum diversion requirements, If irrigators <br /> <br />-5- <br />