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system. An average of 12,000 acre -feet of water flows past the Oracle Road bridge in the <br />Rillito Creek yearly. Impounding streamflow in the channel would enhance the natural <br />infiltration of runoff water in an area with high groundwater demands. <br />Participants <br />The Rillito Recharge Project was part of a larger effort to address water availability in the <br />area. An interagency agreement established the Rillito Fund to provide funding (table 1). <br />Table 1.— Cooperators' intergovernmental agreement local <br />cost -share expenditures <br />Arizona Department of Water Resources $275,060 <br />Pima County Flood Control District 275,060 <br />Tucson Water Department 275,060 <br />Total <br />$825,180 <br />Several local entities entered into partnerships with the sponsor, providing funding as <br />well as technical studies and review of project work products. This group formed the <br />Rillito Project Management Committee in 1987 to advise the cooperators in developing <br />feasibility and other supporting studies. Members were: the Pima County Flood Control <br />District, Arizona Department of Water Resources (ADWR), Tucson Water Department, <br />University of Arizona, USGS, and private consultants. Although not an official member <br />of the committee, Reclamation's Phoenix Area Office High Plains Program Coordinator <br />participated in the monthly meetings. The committee was disbanded in December 1992. <br />This High Plains States Groundwater Demonstration Project consisted of: Pima County <br />Flood Control District, Reclamation, EPA, the U.S. Fish and Wildlife Service (Service), and <br />USGS. Interagency agreements with the Federal cooperators, EPA, USGS, and the Service <br />were signed in summer 1990. The cooperative agreement with the project sponsor, which <br />included a development plan, monitoring plan, quality assurance plan, and environ- <br />mental mitigation plan, was signed in August 1991. <br />Study Goals <br />The project's ultimate goal was to impound storm runoff water in Rillito Creek, a <br />normally dry stream subject to potentially destructive flash flooding. A real -time data <br />collection network would have monitored precipitation, streamflow, and other <br />environmental factors within the watershed. An automated system would have used <br />this information to determine the appropriate impoundment activity. <br />High Plains States Groundwater Demonstration Program <br />