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Last modified
7/14/2009 5:02:35 PM
Creation date
6/1/2009 11:58:11 AM
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UCREFRP
UCREFRP Catalog Number
9393
Author
Crist, L. and R. Williams.
Title
Five Year Flaming Gorge Research Program FY 1995.
USFW Year
1994.
USFW - Doc Type
32-41, Fg-I,
Copyright Material
NO
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<br />depend on the water year, with a longer release period occurring during high water years. The <br />post-peak decline in releases will consist of at least 2,000 cfs for one additional week, stepping <br />down at a rate of not more than 400 cfs/day. The descending arm of the hydrograph will be <br />- synchronized with the conclusion of spring-runoff conditions in the Yampa River. During <br />average water years, the entire spring peak will occur for a period of 6-8 weeks. <br />SUMMER.-The rationale for summer flow recommendations was to maximize summer nursery <br />habitats for young-of-year (YOY) Colorado squawfish. Water releases from FGD will continue <br />to decrease following the spring period until a flow of between 1,110-1, 800 cfs is attained <br />(actual flow within the recommended cfs range will be based on Reclamation needs). <br />Fluctuations will deviate no more than 25% (based on hourly values) below the established <br />maximum flow. The date for achieving the target flow will be based on the Yampa River <br />hydrograph. During average or high water years, the target flow probably wi11 occur on or near <br />July 10 or July 20, respectively. During low water years, the target flow probably will occur on <br />or near June 20. <br />FALL.-Fall flows will be a continuation of summer flows described above. During high water <br />years, however, because most YOY endangered fishes are past the larval period of <br />development by fall, the upper limit of the target-flow range could be increased to 2,400 cfs. <br />If water conditions dictate, a new target flow could be selected on or after September 15. The <br />standard of fluctuations below the maximum flow not exceeding 25% will remain in effect. The <br />target flow will be maintained until November 1 of each year. Flows after this date are <br />addressed in recommendations for the winter period. <br />WINTER.-Winter flows will be stabilized once ice cover forms and will remain stable through <br />ice breakup in spring. A possible exception to this recommendation is when evidence shows <br />that higher winter flows will be necessary to ensure attainment of spring through fall flows. If, <br />under certain circumstances, ice fomtation does not occur or specific research flows are not <br />requested, water releases from FGD will depend on constraints of Reclamation agreements <br />with the State of Utah or the need to release more water during high water years. If possible, <br />flow fluctuations will be moderated. <br />' 3.0. FIVE YEAR FLAMING GORGE RESEARCH PROGRAM <br />3.0.1. RESEARCH PROGRAM GOALS AND OBJECTIVES <br />GOAL.-Determine the biological and physical responses of the Green River ecosystem (from <br />FGD to Lake Powell) to implemented seasonal flow recommendations related to operation of <br />FGD, develop reliable data for refinement of the flow recommendations, and investigate <br />potential effects of increasing the temperature of water released from FGD.. <br />OBJECTIVE 1.-Track the reproductive success of endangered and other fishes in the Green <br />and Yampa rivers and determine relationships between flow and spawning success of <br />endangered and other fishes downstream of FGD. <br />Flaming Gorge Research Program 3 <br />
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