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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:12:54 PM
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UCREFRP
UCREFRP Catalog Number
9705
Author
Green River Study Plan ad hoc Committee.
Title
Study plan for the implementation and evaluation of flow and temperature recommendations for endangered fishes in the Green River downstream of Flaming Gorge Dam.
USFW Year
2007.
USFW - Doc Type
Upper Colorado River Endangered Fish Recovery Program
Copyright Material
NO
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<br />GREEN RIVER STUDY PLAN <br /> <br />28 <br /> <br />February 2,2007 <br /> <br />Implementation <br /> <br />· New Start.- The study should begin as an evaluation of floodplain nursery habitat <br />availability and quality during the winter of 2007-2008 (FY 2008). Depending on the <br />availability of hatchery-reared fish and peak flows of sufficient magnitude to inundated <br />floodplain habitats, a study of habitat quality, survival of young-of-the-year razorback <br />suckers, and survival and movement of subadult razorback suckers into the main stem <br />river would be initiated and continued for three successive years. Assuming fish and <br />flows are available in the spring of 2008, the study would continue through 2011. A final <br />report would be prepared in the following year (2012). <br /> <br />2: Complete evaluation of recent peak flow studies related to floodplain <br />inundation and entrainment of larval razorback suckers, and determine the <br />need for additional studies. <br /> <br />Description <br /> <br />A three-year study of entrainment and floodplain inundation is in its third year, and a <br />fmal report is expected at the end of 2007. The results of this study should be evaluated to <br />determine if additional studies are needed. Among the issues that should be addressed by the <br />fmal report are the flows at which key floodplains with levee breaches become connected to the <br />mainstem and inundated, entrainment rates at different flows, levee breach configuration that <br />enhances larval entrainment, and the effect of river flows on associated channel geomorphology. <br /> <br />The magnitude and duration of spring flows necessary to optimize larval entrainment <br />under the full range of hydrologic conditions (e.g., wet, moderately wet, average, etc.) is an <br />outstanding information need. This includes, but is not limited to, the analysis of possibilities for <br />meeting the goals of the flow recommendations at various peak flows (including peak flows that <br />minimize spillway use and the risk of nonnative fish escapement from Flaming Gorge <br />Reservoir). The synthesis of these studies should be used to assess differences in floodplains that <br />translate to year-to-year variability in configuration and larval entrainment. Understanding <br />annual variability of floodplains will help to better understand timing and magnitude of dam <br />releases that most benefit the endangered fish. <br /> <br />Data collected on floodplain habitat connection and inundation (aerial photography, inlet <br />surveys), sediment deposition and erosion in floodplain habitats, and entrainment studies should <br />be integrated to determine how entrainment is affected by flow and physical characteristics of <br />floodplain habitats (Table 2; e.g., Western aerial photography, Cap 6 HYD physical evaluation <br />of floodplain habitat, 85f sediment monitoring, evaluation of ecosystem restoration and <br />management options for the Ouray NWR). The synthesis report will provide important <br />information to determine the effectiveness of existing flow recommendations, and identify <br />opportunities for refinement of flow management strategies to entrain larvae, provide sufficient <br />floodplain nursery habitat, and maintain floodplain habitats over the long-term. As necessary, <br />additional studies that address priority hypotheses and information needs should be planned for <br />subsequent years. <br />
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