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<br />Hydrologic Data Deficiencies <br />One of the main conclusions of the Stanford (1994) report was that <br />resolution of flow regime uncertainties requires a greater understanding of the <br />coupling of flow processes and riverine bioproduction involving the flooding of <br />bottomlands. He recommended that several specific reaches be selected that <br />include a full range of channel morphology components and their responses to <br />variable flow conditions be monitored in detail. He also suggested that alluvial <br />reaches be selected over canyon reaches because they support a greater diversity <br />of the habitat associated with flooded bottomlands. <br /> <br />It is unfortunate that some of the important USGS gaging stations have <br />been discontinued or have had sediment data collection terminated. Sediment <br />data would have quantified the sediment movement in the Green River system <br />post Flaming Gorge. Specifically, the Ouray, Utah gage on the Green River, the <br />Deerlodge Park gage on the Yampa River and the Dixon gage on the Little Snake <br />River were terminated and daily sediment load measurements were curtailed at the <br />Green River Jensen gage and the Little Snake River, Lily gage. Reestablishment of <br />these gages as well as resumption of sediment load measurements at Lily and <br />Jensen gages during the high flow periods is important. Bi-monthly measurements <br />would suffice during the low flow season. Sediment data collection should also be <br />done at Ouray and Deerlodge Park gages. <br /> <br />Little Snake River peak flow duration, frequency and timing should be <br />analyzed. Flow duration curves derived by Butler (1988a) should be updated and <br />analyzed for various periods to reveal the effects of flow depletion from the upper <br />basin. The flood frequency return periods and peak flow timing should be <br />compared with Yampa River and Green River hydrographs. <br /> <br />45 <br />