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1 <br />1 <br /> <br /> <br /> <br />1 <br />1 <br /> <br /> <br /> <br />Recommendations <br />The discharge monitoring program throughout the Green River system provides <br />important data for biological and river morphology research. River engineers can use the <br />discharge data for hydrologic analyses and predictive flood routing. For the first time in more <br />than 20 years, there are more than two discharge hydrographs to represent the Green River flows. <br />As a result, the USGS Green River gage discharge estimates have been shown to be subject to <br />shifting stages and may be inaccurate by 1,000 cfs or more. <br />The re-installation of the Canyonlands level logger and the other upstream level loggers <br />requires relatively minimal effort. The level loggers have to be replaced in the pipes and two or <br />three discharge measurements are recommended to verify the rating curve each year. This is all <br />the work necessary to continue monitoring the seasonal high flow hydrographs throughout the <br />Green River system. The data base will be useful for future analyses of Flaming Gorge releases, <br />flooded bottomlands restoration, FLO-2D flood routing simulation and Recovery Program field <br />research. The discharge monitoring program should be continued with the following specific <br />recommendations: <br />• The Canyonlands level logger should be replaced in late March or early April in <br />conjunction with the other upstream level loggers. <br />• A minimum of two or three discharge measurements should be collected each year to <br />calibrate the rating curve. <br />' More frequent discharge measurements should be collected by the USGS at the <br />Jensen and Green River gages during the high flows in May and June. More <br />discharge data would improve the resolution of the USGS discharge estimates during <br />' periods of stage shifts. <br /> <br /> <br />t <br /> <br /> <br /> <br />• The discharge monitoring program is essential to the calibration of the FLO-2D <br />routing model to predict the effects of Flaming Gorge releases. It is recommended <br />that the discharge monitoring program continue and be closely coordinated with the <br />development of the FLO-2D flood routing system. <br />19 <br /> <br />