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<br />The model study was originally planned to be undertaken in two <br /> <br />phases. The first phase was p;Lanned for a generalized two-dimensional <br /> <br />study of various structure shapes. The second phase of the model studies <br /> <br />was intended to include a three-dimensional model of the Del Rio site; <br /> <br />specifically to establish structure location and fundamental dimensions <br /> <br />to assure adequate performance with respect to local sediment deposition <br /> <br />and scour. As the study developed, however, the three-dimensional mOdel <br /> <br />was found unnecessary. Instead, further generalized studies were made <br /> <br />in an 8-rt wide flume to study the effects on the transverse water sur- <br /> <br />face profile of local deposition upstream of the structure by mutual con- <br /> <br />sent of Colorado State University and representatives of the Boundary <br /> <br />Commission. <br /> <br />This report will be confined to the model studies conducted in the <br /> <br />laboratory. The objectives of the laboratory studies were: <br /> <br />1. To determine the generaJ. shape of the structure cross- <br /> <br />section consistent with efficient and effective hydraulic <br /> <br />performance. <br /> <br />2. To establish a structure with a stable stage-discharge <br /> <br />relationship. <br /> <br />3. Determine a suitable crest width of structure parallel to <br /> <br />the direction of flow. <br /> <br />4. Establish the controlling design features of the structure, <br /> <br />i.e., height and location of the sill on the crest. <br /> <br />5. Locate suitable positions on the structure for stage and <br /> <br />discharge measurements. <br /> <br />6. Make a general study of the effects of sand bars upstream <br /> <br />of the structure on the transverse water surface profile. <br /> <br />-2- <br /> <br />. ., : I .. (- ~ - -:r <br />lr .. 1 ,-, (., I <br />