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<br />Executive Summary <br /> <br />Background. <br /> <br />The United States Fish and Wildlife Service (USFWS) has identified Duchesne River flows <br />as having potentially significant benefits to endangered fish. The lower 2 J,2-mile reach of <br />the Duchesne River has been designated as critical habitat for the Razorback Sucker. The <br />Management Committee of the Recovery Implementation Program (RIP) authorized <br />funding for a comprehensive review of the effects of existing and proposed projects on the <br />flow regime in the designated critical habitat reach of the Duchesne River. The Central <br />Utah Water Conservancy District (CUWCD) agreed to complete the study with RIP funds. <br />This report is the compilation of this study, <br /> <br />Study Purpose and Objectives <br /> <br />The main purpose of the study was to determine the effect of existing projects (both existing <br />and future operation) on Duchesne River flows and to identify possible water sources on <br />the Duchesne River that could be used to augment river flows, if needed, to meet USFWS <br />endangered fish flow recommendations. <br /> <br />The study objectives are described below: <br /> <br />. To determine present flow regime on Lower Duchesne River <br /> <br />. To determine historical changes to that flow regime <br /> <br />. To identify flow surplus or deficiencies of present flow regime with respect to <br />USFWS identified flows <br /> <br />. To locate potential water sources to meet any needed flow deficiencies <br /> <br />Summary of Agency Workshops <br /> <br />Five workshops were held with federal and state agencies, water agencies, water users, and <br />other interested parties to discuss the study, its methods, the scope of the work, study <br />objectives, and to share knowledge among the group. As study results became available, they <br />were shared. The five workshops were held on April 25, May 31, June 28, August 7, and <br />September 9, 1996. Complete meeting notes, copies of material presented, and attendance lists <br />for each of the meetings are included in the Appendices. <br /> <br />Flow Analysis of the Duchesne River <br /> <br />An examination of impacts with changing upstream operation on the Duchesne River was <br />done by dividing the record into two periods (pre-1970, post-1970) to develop statistics for <br />each period. The pre-project period was assumed to represent historical flow regime and <br />the post-project period was assumed to reflect current flow regime with increased <br />diversions from such projects as CUP and Provo River Project. There is no defined date <br /> <br />SLC\134107\REPT1.DOC <br /> <br />E -1 <br />