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Analytic vs. Numeric Ground Water Models and South Platte Decision Support <br />System (SPDSS) <br />Glover/Modflow/SPDSS Information <br />Ray Bennett, Division of Water Resources discussed the analytical ground water models <br />noting that they simplify the ground water system and make assumptions. In the <br />numeric models the aquifer is broken into cells with the ability to set different parameters <br />for each cell. The distributed aquifer systems and depletion functions are the same as in <br />the analytical model but data is assigned to eac h cell. The numeric model is more time <br />intensive. Stream depletion numbers will be si milar, but you will also get water levels. <br />Ray Bennett noted that the South Platte Decision Support System (SPDSS) is the third <br />major decision support system that has been built. The SPDSS does not support the <br />Republican, but does include the North Platte. He identified the major components of <br />the SPDSS, and the data gathered including tabular data, spatial data, and irrigated <br />acreage mapping. Mr. Bennett reviewed the components of the Consumptive Use, <br />StateMod, and the Modflow models. <br />Discussion was held with the task force members on augmentation plan decrees, and <br />the level of variability in the augmentation plans and the SPDSS. <br />Options for Consideration <br />Options for Discussion <br />Alex Davis distributed a document categorizing the options for consideration that were <br />gathered from the first two task force meetings and public comment. <br />Task force members held discussion on further information they would like to receive <br />including a clear articulation of what the problem is and the number of wells that have <br />been curtailed or shut-down; augmentation am ounts; and quantification of the overall <br />water supply issues. They also discussed the boundaries set forth in the Executive <br />Order for the task force; non-injury to senior water rights holders; and keeping the <br />general framework of the administrative and adjudica tive sides of the problem in mind. <br />Dick Wolfe stated that the numbers are continually being refined. However, current <br />numbers indicate there are 8,200 wells subject to administration with 5,800 of those <br />wells under augmentation plans. Jim Hall discussed the spectrum of the 2,400 wells not <br />in augmentation plans. He noted that some of these wells are unintended for pumping <br />and staff is going well by well to see if there is a current plan. About 50% of the wells <br />were curtailed or shut-off. Jim Hall stated that the profile has gone up dramatically <br />because some of the augmentation plans that failed are wells people depended on and <br />they have not been able to get plans adjudicated. <br />Discussion was held with task force members on the priority system, the need for ‘real <br />water’ solutions, and the cost of augmentation water. They began discussion on the <br />options for consideration. <br />The options identified for task force consideration have been put into three categories: <br />1) Suggestions for making water available for well augmentation or decreasing <br />amount of augmentation water required to augment wells; <br />2) Suggestions for increasing overall supply of water in the South Platte River <br />Basin; and <br />