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I I I I I I I I I I I I I I I I I I I examined the GPS signals and eliminated all the ones not considered to be RTK, based on the GPS data quality indicator in the GGA string. Therefore because data was being collected from the sonar at such a high rate, and sonar readings were sometimes affected by floating material like fish or woody debris, spikes in the sonar data were eliminated based on the running average of the three sonar pings prior to and after a given sonar ping. If the elevation recorded in a given reading was different than the moving average of the 6 readings surrounding the given reading by more than 15cm, that ping was marked as "bad". If an RTK GPS reading had a "bad" sonar ping recorded directly before or after it, that GPS reading was ignored. For those RTK GPS signals with "good" sonar recordings before and after them, the depth for that GPS position was determined through a linear interpolation of the sonar data based on the time tags. HYDRAULIC SIMULATION Hydraulic simulation and 2-D flow modeling was contracted with the Earth Resources I Department of Colorado State University (CSU). Greg Stewart, a graduate student at CSU, collected, input the data for hydraulic modeling and performed the analysis. Many attempts were made to run the 2-D model during the first year of this contract but two-dimensional modeling results could not be presented in the 1999 annual report. Several difficulties in making production model runs were encountered again this year. These difficulties are identified and discouraged the use of this particular model by persons without extensive training and familiarity with RMA2 and supportive software. Pre-model modeling using HEC-RAS The two-dimensional model RMA2 cannot handle the drying of any point along any inflow or outflow boundary. Because the purpose of this project was to model a range of 21