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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />checked, since fish or woody debris can sometimes cause spikes in the sonar data. Spikes <br /> <br />were eliminated based on the running average of the 3 sonar pings prior to and after a given <br /> <br />sonar ping. If the elevation recorded in a given reading was different than the moving average <br /> <br /> <br />of the 6 readings surrounding the given reading by more than IScm, that ping was marked as <br /> <br /> <br />"bad". If an RTK GPS reading had a "bad" sonar ping recorded directly before or after it, that <br /> <br /> <br />GPS reading was ignored. For those RTK GPS signals with "good" sonar recordings before <br /> <br />and after them, the depth for that GPS position was determined through a linear interpolation <br /> <br /> <br />of the sonar data based on the time tags. Topographic data were also examined visually using <br /> <br /> <br />ArcView. In ArcView bed elevations could be examined by using the Triangular Irregular <br /> <br /> <br />Network (TIN) module or by color coding coordinate points by elevation. <br /> <br />Hvdraulic Simulation <br /> <br />In the first two years of the project hydraulic simulation and 2-D flow modeling <br /> <br />was contracted with the Earth Resources Department of Colorado State University <br /> <br /> <br />(CSU). Greg Stewart, a graduate student at CSU, collected, input the data for hydraulic <br /> <br /> <br />modeling and performed the analysis during the time period June of 1998 to June 2000. <br /> <br /> <br />Last years progress report and the M.S. thesis authored by Mr. Stewart details hydraulic <br /> <br /> <br />methods, problems and innovations used for making flow simulations on the Colorado <br /> <br /> <br />River IS-Mile Reach (Corn Lake) and the Yampa River site at Duffy Tunnel. For <br /> <br /> <br />documentation on modeling techniques refer to those reports. <br /> <br />Greg Stewart was instrumental in installation and operation of technical equipment <br /> <br />and data handing for the 2-D modeling and his departure from the project meant no new 2-D <br /> <br />modeling until a replacement contractor was found. An attempt to instate a new contract (sole <br /> <br />source) to continue hydraulic simulations in 2000/20001 fiscal year failed, therefore only <br />17 <br />