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<br />C~ <br />6. "RGDSS" means the Rio Grande Decision Support System, including <br />the RGDSS ground water model, developed by the Colorado Water <br />Conservation Board and the Colorado Division of Water Resources. <br />7. "RGDSS ground water model" means the finite difference model and <br />its associated modular computer programs developed by the U.S. <br />Geological Survey to simulate, among other things, the flow of ground <br />water (commonly known as "MODFLOW"), as adapted and applied by <br />the Office of the State Engineer to simulate the unconfined aquifer and <br />the Confined Aquifer System. The RGDSS ground water model <br />means the model as it currently exists and as it may be revised from <br />time to time as new data or knowledge of the relationship between the <br />unconfined aquifer; the. Confined Aquifer System, and surface streams <br />becomes available. The current exterior boundaries of the RGDSS <br />ground water model are shown on the attached Exhibit 1. <br />8. "New withdrawal of ground water" means the withdrawal of ground <br />water from a well not yet in existence, the withdrawal of a new, <br />increased, or additional supply of ground water from an existing well, <br />or the conversion of an existing observation or monitoring well into a <br />production well. <br />B. Any term used in these rules that is defined in sections 37-90-103 or 37- <br />92-103, C.R.S., shall have the same meaning given therein unless the <br />context requires otherwise. <br />5 <br />