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Section 5 Addressing the Water Supply Gap Technical Roundtable Table 5-4 Colorado Utilities with Authorized Nonpotable Reuse Programs City of Aurora Water Department Ciiy of Westminster Reclaimed WTF Plum Creek Wastewater Authority Ciiy of Louisville Wastewater Treatment Plant Colorado Springs Utilities /Las Vegas Wastewater Treatment Facility Colorado Springs Utilities' --Northern Water Reclamation Facility Fairways Metropolitan District Denver Water Ciiy and Couniy of Broomfield Parker Water and Sanitation District (PWSD North and South WWTP) Lone Tree Creek WWTF Lone Tree Creek WWTF Fort Collins Utilities Tamarron Management Associates, LLC Ciiy of Yuma Metro Wastewater Reclamation District Cornerstone Metropolitan District No. 1's Cornerstone Wastewater Treatment Faci Kremmling Sanitation District 5.3.3 Agricultural Transfers The transfer of water from agriculture to M~eI use will continue, especially in the South Platte and Arkansas Basins. SWSI Phase 1 estimated potential changes in irrigated acreage. This figure is in Section 3 of this report as Figure 3-l. Section 3 of this report provides further discussion of alternative agricultural transfer methods. Two structural water supply concepts were discussed and developed during the TRT process one in the Arkansas Basin and one in the South Platte Basin. These structural projects seek to provide a permanent and reliable water supply to meet major Front Range gap areas. The method of acquiring and transferring the water is not specifically delineated in the alternative and could be one or more of the methods described in Section 3. Section 5.4 of this report provides more detail on the Agricultural Transfer Alternative from the South Platte and Arkansas Basins. In addition to direct reuse programs -those that use a distribution pipeline network to deliver reclaimed water from a wastewater treatment plant to a user's site treated wastewater efIluent in Colorado is reused in many other ways. For example, several utilities exchange their treated efIluent for the right to divert water further upstream for potable supply or other uses. More recently, Front Range utilities have begun to implement indirect potable reuse programs. Indirect potable reuse involves the capture of legally reusable return flows and reintroduction of these captured flows into the municipal raw water supply. The return flows that are captured may have been discharged to a river or stream and mixed with other waters. Other options include the capture of treated wastewater efIluent and additional treatment. The captured flows are then reintroduced into the municipal raw water supply system. This type of water will likely require advanced water treatment methods beyond current treatment levels before the recaptured water can be introduced into the raw water supply. 5.3.4 New Water Supply Projects Including Storage New storage and the more effective use of existing storage are means to provide additional water supplies. Given current shortages in headwater areas, the desire to provide for the environment and recreation in headwater areas, and the fact that water supply generally increases as you move downstream indicates that the opportunity to develop or use existing storage should generally focus on areas in the middle to lower reaches of watersheds. To maximize the use of new and existing storage it is also prudent to look at conjunctive use of groundwater and surface water. 5.4 Major Water Supply Alternatives for Select Gap Areas As part of the Gap TRT, a total of seven major water supply alternatives using the above strategies were investigated. The intent of looking at structural alternatives was to create infrastructure and nonstructural options that would have a multi- purpose focus integrating M~eI, agricultural, environmental, and recreational needs and also 5-18 FINAL DRAFT