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<br />~- 1 <br /> <br />examined the GPS signals and eliminated all the ones not considered to be RTK, based on the <br /> <br />GPS data quality indicator in the GGA string. Therefore because data was being collected <br /> <br />from the sonar at such a high rate, and sonar readings were sometimes affected by floating <br /> <br />FJ <br /> <br />material like fish or woody debris, spikes in the sonar data were eliminated based on the <br /> <br />running average of the three sonar pings prior to and after a given sonar ping. lfthe elevation <br /> <br />recorded in a given reading was different than the moving average of the 6 readings <br /> <br />surrounding the given reading by more than 15cm, that ping was marked as "bad". If an RTK <br /> <br />GPS reading had a "bad" sonar ping recorded directly before or after it, that GPS reading was <br /> <br />n <br />l. <br />f..'.... <br />r ' <br />t.;J <br /> <br />ignored. For those RTK GPS signals with "good" sonar recordings before and after them, the <br /> <br />depth for that GPS position was determined through a linear interpolation of the sonar data <br /> <br />based on the time tags. <br /> <br />r- .1 <br />, <br /> <br />"';. <br /> <br />HYDRAULIC SIMULATION <br /> <br />Hydraulic simulation and 2-D flow modeling was contracted with the Earth Resources <br /> <br />t-- -1 <br />, <br />~ '~ <br />LJ <br /> <br />Department of Colorado State University (CSU). Greg Stewart, a graduate student at CSU, <br /> <br />~..:...~; <br />'.... <br />'-~~ <br /> <br />collected, input the data for hydraulic modeling and performed the analysis. Many attempts <br /> <br />were made to run the 2-D model during the first year of this contract but two-dimensional <br /> <br />modeling results could not be presented in the 1999 annual report. Several difficulties in <br /> <br />~'j <br />k..~:.:......' <br />f' <br />,.:.' <br />l/,. <br /> <br />making production model runs were encountered again this year. These difficulties are <br /> <br />identified and discouraged the use of this particular model by persons without extensive <br /> <br />training and familiarity with RMA2 and supportive software. <br /> <br />r :J <br />! -l <br />i...J <br /> <br />Pre-model modeling using HEC-RAS <br /> <br />The two-dimensional model RMA2 cannot handle the drying of any point along any <br /> <br />inflow or outflow boundary. Because the purpose of this project was to model a range of <br />21 <br />