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<br />. <br /> <br />. <br /> <br />. <br /> <br />'0 J 2'77'2. <br /> <br /> <br />. . <br />,. - --:-. ~ ~:..:..;,;...,":. ~..~ . <br />, <br /> <br />.. "'i-~'=..'t'-.. <br /> <br />. . . . <br />Figure 2. A top view ofa 3-D computer model of a'U~structure demonstrates its arched design.. . <br /> <br />This structure is very stable and will accommodate high volumelhigh:yelocity flows. The <br />structure features an arched shape laid in the plane defined by the riverbed with its footing sunk <br />into the riverbank, as shown in Figure 2, to bear these loads. The arch is a classic support . . <br />structure that dates back to Roman civilization. This stnlcture has two properties that make it <br />desirable for in-stream use, The first is that it is extremely strong and stable, This structure can <br />sustain very high and very imbahmced loads without becoming unstable. The second property <br />of arches that makes them desirable for in-stream use is that all stresses induced in the arch due <br />~~..~...'-',~-" -. <br />to external loading on the top face are compressive. <br /> <br />-7- <br />