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<br />MODEL SCALE CONSIDERATIONS <br /> <br />Two-Dimensional Studies <br /> <br />An undistorted model scale of 1:5, model to prototype, was chosen <br /> <br />for the two-dimensional studies conducted in two 2-ft wide flumes as <br /> <br />explained in the next chapter. The choice of scale was based on the <br /> <br />physical dimensions of the available laboratory flumes. Initially, tests <br /> <br />were conducted in a flume with movable bed. Later, tests were made in a <br /> <br />rigid bed flume. With the chosen model scale, excluding considerations <br /> <br />of modeling the sediment, the following relationships apply: <br /> <br /> L <br />L = P = 5 <br />r r;- <br /> ID <br />~ = 'lp = (L )3/2 = 11.2 <br /> Clm r <br /> <br />v <br />V '" ...:g = <br />r V <br />m <br /> <br />(L //2 = 2.24 <br />r <br /> <br />Wide Flume Studies <br /> <br />Tests in the 8-ft wide flume were confined to studies of the effects <br /> <br />of sand bars in the upstream channel on the lateral profile of the water <br /> <br />surface over the control structure. Because the stage-discharge curve <br /> <br />would be based on point measurements of stage over the control structure, <br /> <br />variations in lateral water surface profiles can yield misleading discharge <br /> <br />values. <br /> <br />\. 'Ii" - ., <br />\,..,0 I... ..,,:W U <br /> <br />-3- <br />