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Last modified
7/14/2009 5:02:29 PM
Creation date
5/20/2009 3:42:12 PM
Metadata
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Template:
UCREFRP
UCREFRP Catalog Number
7245
Author
Rose, K. L. and D. R. Hann.
Title
Consolidated Instream Flow Report, Habitat Modeling on the Green River Using the Physical Habitat Simulation System.
USFW Year
1989.
USFW - Doc Type
Grand Junction, Colorado.
Copyright Material
NO
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<br />The WUA for a stream reach is then determined by the equation: <br />WUAa.s = sum of C1.S x ~ <br /> <br />where <br /> <br />WUAa.s <br /> <br />= the weighted-useable-area for a particular species and <br />life stage at a particular flow. <br /> <br />C~ = the sUitability index for the combined characteristics of <br />the cell (i), by the target species (s). <br /> <br />~ = the surface area of the cell. <br /> <br />It must be remembered that calculation of WUA does not~completely describe the <br />quantity or quality of available fish habitat. It does, however, provide a <br />structured approach for utilizing streamflow dependent microhabitat variables <br />as an index to describe potential fish habitat in riverine environments. <br /> <br />III. ' STUDY REACH ANALYSIS <br /> <br />The Green River sub~basin comprises about 116,000 km2 (45,000 mi2) of the <br />284,000 km2 (109,500 mi2) occupied by the UCRB (Tyus et. al 1987). It is the <br />largest tributary to the mainstem Colorado River, and extends about 800 linear <br />kilometers (500 mil to its headwaters in the Wind River Range of Wyoming (Tyus <br />et. al 1987). <br /> <br />Frqm 1955 to 1961 prior to the closure of Flaming Gorge Dam, the mean monthly <br />flows at the Jensen gage, RM 305, ranged from a low of 533 cfs in December, to <br />a high of 26440 cfs in June. From, 1962 to 1986, the mean monthly flows have <br />ranged from a low of 346 cfs in October, to a high of 24110 cfs in May <br />(Appendix A). <br /> <br />A. RUDle Ranch Study Site <br /> <br />The Ruple Ranch study site, 3282 ft in length, is located between RM 332.3 and <br />333.0. It morphologically represents sub-segment E of Segment 3, from Little <br />Rainbow Park upstream to the Cove just below Whirl Pool Canyon (RM 326.8- <br />334.0). The area encompasses Little Rainbow, Rainbow, and Island Parks, and <br />is dominated by multiple channels and numerous vegetated islands (Figure 6). <br />The river meanders with a low gradient (slope=0.00097) through an alluvial <br />flood plain resting on Navajo sandstone. The west edge of the river joins a <br />broad flood plain vegetated by sagebrush (Artemisia sp.), saltbush (Atriolex <br />sp.), rabbitbrush (Chrysothamus sp.), a variety of grasses, and a few <br />cottonwood trees (Pooulus sp.). The east edge is bound by a steep, sparsely <br />vegetated bank which lies against sheer walls of sandstone. <br /> <br />The channel stability of the Ruple Ranch study site is presently beinganalyzed <br />by the FWS Division of Water Resources, Region 6. The preliminary evaluation <br />of the channel processes, location and extent of islands, bars, vegetation, <br />topography, geology, and land use suggests that persistent channel narrowing <br />has ceased and a new equilibrium condition has been attained in the Green <br />River (Regional Hydrologist, Division of Water Resources Region 6, memo to <br />Keith Rose, Project Leader, Endangered Species, Grand Junction, 3 December <br />1987). Some changes were noted, however, in alluvial reaches of the Island <br /> <br />15 <br />
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