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Last modified
7/14/2009 5:02:35 PM
Creation date
5/24/2009 7:14:23 AM
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Template:
UCREFRP
UCREFRP Catalog Number
9376
Author
CH2MHill.
Title
Duchesne River Hydrology and Water Availability Study.
USFW Year
1997.
USFW - Doc Type
\
Copyright Material
NO
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<br />~ Executive Summary <br />r <br /> Background <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 21iz-miles of the <br /> Duchesne River have been designated as critical habitat for the razorback sucker. The <br /> Management Committee of the Recovery Implementation Program for Endangered Fish <br /> Species in the Upper Colorado River Basin (RIP) authorized funding for a comprehensive <br /> review of the effects of existing and proposed projects on the flow regime in the designated <br /> critical habitat reach of the Duchesne River. The Central Utah Water Conservancy District <br /> (CUWCD) acted as the contracting agent to complete the study with RIP funds. This report <br /> is the compilation of this study. <br />As will be discussed herein, the study provides information on flows in the lower Duchesne <br />River as published by the United States Geological Survey (USGS). This data is actual data <br />from 1943 to 1994 with data correlated back to 1912 using the data from the Myton gage. <br />' This data is compared to the United States Bureau of Reclamation (USBR) pre-development <br />flows which estimate flows without influence from man. The difference between these two <br />sets of data is considered to be the depletion from the river. Future depletions are discussed <br />' and estimated data presented. Comparisons of flows in the river are made to USFWS <br />preliminary recommended flows to determine deficiencies. <br /> Study Purpose and Objectives <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 preliminary flow recommendations. <br /> The study objectives are described below: <br /> • To determine present flow regime on lower Duchesne River <br />~, • To determine historical changes to that flow regime <br /> • To identify flow surplus or deficiencies of present flow regime with respect to <br />' USFWS identified flows <br /> • To locate potential water sources to meet any needed flow deficiencies <br /> <br /> Summary of Agency Workshops <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 work, study objectives, <br /> and to share knowledge among the group. As study results became available, they were <br /> <br /> SLC11341071REPTI.DOC ES -1 <br /> <br />
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