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<br />data were collected. Transport equations for the smaller particle sizes tended to have <br />higher coefficients of determination than the equations for coarser sizes. Because the <br />data had to be subdivided into at least two subsets (rising-limb, falling-limb, and <br />occasionally, base-flow periods), the seasonal transport equations generally were based <br />011 relatively few samples. All transport equations probably could be improved by <br />additional data collected at strategically timed periods. <br /> <br />IV. Study Schedule: Initial year - 1998, Final year - 2008 <br /> <br />V. Relationship to RlPRAP: <br /> <br />Yampa River Action Plan: Yampa and Little Snake Rivers I.AA.a(3) <br />Y ampaRiver Operation and Management Plan <br /> <br />VI. Accomplishments ofFY 2002 Tasks and Deliverables, Discussion ofInitial Findings and <br />Shortcomings: <br /> <br />The purpose of this study is to provide data and sediment-transport relations that will be <br />useful in assessing the.potential effects of hydrograph modification by reservoir operation <br />on sedimentation at identified razorback sucker spawning bars in the Green River. <br />Sediment data from five sites in the Yampa River Basin and the Upper Green River Basin <br />have been collected. by the USGS during an ongoing, multiyear study that began in 1998 <br />and continued through water year (WY) 2002. These data were augmented with sediment <br />data gathered at these sites in earlier years as part of other USGS studies and routine data <br />collection activities. <br /> <br />An interpretive report based on sediment data collected through WY 2000 was prepared <br />for publication as a U.S. Geological Survey Water-Resources Investigations Report in <br />2001. Since preparation of the draft, sediment data from WY 2001 and 2002 have been <br />collected, but not analyzed. Below is a summary of the numbers of samples collected at <br />the five sites through WY 2002: <br /> <br />Station <br />name <br />Yampa River above Little Snake <br />Little Snake River near Lily <br />Yamp~ River at Deerlodge Park <br />Green R. above Gates of Lodore <br />Green River near Jensen <br /> <br />Through Water Year 2000 <br />Suspended Bedload <br />sediment sediment <br />14 14 <br />83 0 <br />74 49 <br /> <br />Through Water Year 2000 <br />Suspended Bedload <br />sediment sediment <br />25 25 <br />96 11 <br />78 53 <br /> <br />23 <br />30 <br /> <br />23 <br />29 <br /> <br />.,., <br />.J.J <br /> <br />.,., <br />.J.J <br /> <br />40 <br /> <br />40 <br /> <br />85 B22 <br />