Metro - ECCV Zero Liquid Discharge Pilot Study_Application

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~ I I Water Supply Reserve Account - Grant Application Form Form Revised May 2007 . 6. Water Availability and Sustainability - this information is needed to assess the viability and effectiveness of the water project or activity. Please provide a description of each water supply source to be utilized for, or the water body to be affected by, the water activity. For water supply sources being utilized, describe its location, yield, extent of development, and water right status. For water bodies being affected, describe its location, extent of development, and the expected effect of the water activity on the water body, in either case, the analysis should take into consideration a reasonable range of hydrologic variation. The East Cherry Creek Valley Water and Sanitation District has constructed its Northern Water Supply Project. This project includes the diversion of transferred agricultural water rights via an alluvial well field downstream of Barr Lake, located downstream of the Denver Metro area. ECCV has acquired and is in the process of transferring through Water Court approximately 6,000 AFY of firm yield water supplies, with the long range plan of developing a total of 9,000 AFY of renewable water via this project. The additional supplies will come from additional water rights acquisitions or the recapture of its reusable return flows, to the extent allowed by law and existing agreements governing the use of these return flows. . The implementation of ZLD will allow ECCV to develop its future water supply since ECCV is limited by existing agreement with the Farmers Reservoir and Irrigation Company for discharge of membrane treatment concentrate waste stream to FRICO irrigation canals. As other Metro water providers and water providers along the Front Range in the South Platte and Arkansas basins seek to reuse consumable return flows or divert lower quality water sources, the issue of the discharge of membrane concentrate waste streams becomes critical. If the salts and other pollutants are not permanently removed from the water cycle, these salts and pollutants will continue to be concentrated. As noted in the Membrane Treatment Workgroup Report, ZLD is critical to achieving a long-term sustainable solution for meeting future M&I water needs, while protecting other water users and the environment. The reuse of M&I return flows from effluent discharges is one of the water sources most resilient to hydrologic variation, since indoor water use will be the most critical water use allowed by water providers in the event of sustained droughts. To the extent lower quality agricultural sources are acquired via traditional or alternative transfers these supplies will likely consist of relatively senior priorities and thus also more resilient to hydrologic variation. . 9