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COM Castle Pines North Metropolitan District Application for Water Efficiency Grant Water use levels in 2003 and anticipated growth patterns were used to estimate future water demands. 2003 baseline levels were chosen because metered data for most customer types are available for this year! and because the 2003 water demands include active conservation measures and a high level of awareness regarding the drought. As a result, future water demand projections assume that existing conservation measures will continue to be implemented and reinforced in the future to ensure that water demands do not increase to pre-2003Ievels. Additional information on the methodology used to estimate water demands are provided in Section 3.2 of the Districes 2006 Water Conservation Plan. 1.3 Future Water Supplies As previously mentioned, the District currently relies on Denver Basin groundwater wells for water supply. The Denver Basin, which supplies water to much of the south metro area and northern EI Paso Connty, is a non-renewable aquifer. Although the District can currently meet its water supply needs, it is projected that continued use of Denver Basin groundwater as the primary source of south metro area water providers would result in a continued decline of groundwater levels. This is attributed to the growing population and to the regional dependence on groundwater. In that event, it is anticipated that the costs to maintain groundwater production rates (e.g., redrilling wells; increased pumping energy requirements) to meet demands will escalate to the point that this source is no longer economically viable. The District has participated in regional planning studies, including the recent South Metro Water Supply Authority Regional Water Master Plan. The District is a proposed participant in Rueter-Hess Reservoir and in the Chatfield Reservoir reallocation project. In addition, the District developed an Integrated Water Resources Plan (IWRP) in 2006, which evaluated the District's demands, conservation measures, and the short-term and long-term sustainability of the District's existing groundwater supply. The IWRP proposed renewable water supply alternatives that would decrease the District's dependence on groundwater. These alternatives include a combination of surface water supplies, reuse of reclaimed water, and conservation. Conservation is a significant component of the District's future water management strategy. 4 These data was provided by Jehn Water Consultants, Inc. The 2003 metered customer types do not correspond with the new customer billing categories (fable 1) used with the new billing system installed in 2004. 6 C:IDOCUMENTS AND SETTINGSIBLACKCAlJlESKTOPlCPNGRANl\W A TER EFFICIENCY GRANT PROGRAM APPllCA lION_DOC