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<br />SUMMARY <br /> <br />Model studies were conducted in the HYdraulics Laboratory at <br />Colorado State University to successfully develop an artificial gaging <br />station control structure with a stable stage-discharge relationship for <br />construction in the Rio Grande with emphasis on the Del Rio site. The <br />recollllllended structure was Weir G (Fig. 8). The minimum satisfactory <br />crest width of the weir parallel to the direction of flow, was found to <br />be 10 feet. The recollllllended upstream and downstream slopes were 2:1 and <br />3:1, respectively. <br />A chart for setting the sill elevation with respect to the tailwater <br />level was developed experimentally. Sand bars in the upstream channel, <br />if formed close to the structure, were found to influence the water sur- <br />face profile normal to the mean flow direction. Therefore, sa'ld and <br /> <br />gravel bars which may form in close proximity to the structure during <br /> <br />floods may require modification in Shape, or on occasions, removal of the <br /> <br />bars. strategic location of a weir to avoid bars immediately upstream is <br /> <br />important. <br /> <br />l~~ ~,i 1 L ~ ,j <br /> <br />-v- <br />