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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 />Methodology <br /> <br />The approach used in this study focused on major patterns of water use to <br />determine whether a Grand Mesa Water Supply Project might be viable, Due to the <br />extreme complexity of the physical and legal diversion mechanisms and the large <br />number of smaller water rights holders and irrigators, a global approach was used <br />in the evaluation of the water supply situation in the study area, The study area <br />was divided into "upper basin" and "lower basin" to establish total water availabil- <br />ity in the simulation studies and to evaluate alternative plans, <br /> <br />The irrigation service areas included in this study are: <br /> <br />Service Area <br /> <br />Area <br />(Acres) <br /> <br />Upper Surface Creek <br />Lower Surface Creek <br /> <br />Total <br /> <br />6,230 <br />9,000 <br /> <br />15,230 <br /> <br />The potential sources and amounts of average annual runoff are: <br /> <br />Source <br /> <br />Average Annual Runoff <br />(acre-feet) <br /> <br />Tongue Creek <br />Leroux Creek <br />Overland Ditch Watershed <br /> <br />18,1/.00 <br />5,300 <br />12,000 <br /> <br />The minimum water requirement (ideal water requirement) was used in estimating <br />water demands, <br /> <br />Non-structural and structural improvements were investigated in the study, Non- <br />structural improvements involved better management and operation of the Grand <br />Mesa reservoirs located in the upper watershed. Structural improvements investi- <br />gated included the construction of a storage reservoir at Cactus Park and <br />possibilities of excess water diversions from Leroux Creek and Overland Ditch <br />watersheds. <br /> <br />-3- <br />