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Last modified
8/11/2009 11:32:58 AM
Creation date
8/10/2009 5:11:21 PM
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UCREFRP
UCREFRP Catalog Number
9700
Author
Hayes, J.W., K.E. LaGory and G.L. Burton.
Title
Consideration of site-specific floodplain inundation thresholds in implementing peak flow magnitude and duration recommendations in the middle Green River, Utah.
USFW Year
2005.
USFW - Doc Type
Argonne National Labortory, Argonne, Illinois.
Copyright Material
NO
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<br />Table 1. Peak Flow Recommendations for Reach 2 of the Green River. Recommendations that are the subject of the proposed <br />flow mana ement strate are hi hli hted. <br /> <br />General <br />recommendation <br /> <br />Peak-flow magnitude <br /> <br />Peak-flow duration <br /> <br />Peak-flow timing <br />Anticipated effects <br /> <br />Source: Muth et al. (2000). <br /> <br />Hydrologic Condition <br /> <br />Wet Moderately Wet Average Moderately Dry Dry <br />(0 to 10% (10 to 30% (30 to 70% (70 to 90% (90 to 100% <br />Exceedance) Exceedance) Exceedance) Exceedance) Exceedance) <br /> <br />Peak flows in Reach 2 should be of the magnitude, timing, and duration to provide floodplain inundation in the Ouray portion of the <br />river for at least 2 weeks in 4 of 10 years and at least bankfull flows in 1 of 2 years. In all years, peak flows should be of sufficient <br />magnitude and duration to provide at least some in-channel habitat maintenance throu hout the reach. No u er limits are laced on <br />recommended eak flows in an h drolo ic condition. <br /> <br />2- 235 mJ/s (8,300 cfs) <br /> <br />Flows greater than <br />235 m3/s (8,300 cfs) <br />should be maintained <br />for at least 1 week. <br /> <br />Flows greater than <br />235 m3/s (8,300 cfs) <br />should be maintained for <br />2 days or more except in <br />extremely dry years (2- <br />98% exceedance). <br /> <br /> <br />Peak flows should coincide with peak and immediate post-peak spring flows in the Yampa River. <br /> <br />Significant inundation of floodplain habitat and Significant inundation No floodplain inundation, but some flooding of off- <br />off-channel habitats (e.g., tributary mouths and of floodplain habitat channel habitats. May benefit recruitment of <br />side channels) to establish river-floodplain and off-channel habitat Colorado pikeminnow in some years. <br />connections and provide warm, food-rich in at least 1 of 4 <br />environments for growth and conditioning of average years; some <br />razorback suckers (especially young) and flooding of off-channel <br />Colorado pikeminnow. habitats in all years. <br /> <br />Significant channel maintenance to rework and Significant channel <br />rebuild in-channel sediment deposits (including maintenance in at least <br />spawning substrates), increase habitat complexity, 1 of2 average years. <br />form in-channel sand bars, and prevent or reverse <br />channel narrowing. <br /> <br />Provide conditions for gonadal maturation and cues for spawning migrations and reproduction by the endangered fishes. <br /> <br />Some channel maintenance in all years because <br />flows exceed the incipient-motion threshold. <br /> <br />~ <br />~ <br />~ <br />::ll <br />~ <br />~. <br />~ <br />""'l <br />~ <br />o <br />o <br />~ <br />is'' <br />S. <br />~ <br />!:: <br />~ <br />::to <br />o <br />::ll <br /> <br />v, <br /> <br />~ <br />~ <br />t-"l <br />c;::::, <br />c;::::, <br />v, <br />
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