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Figure 7. A top view of a 3 -D computer model of a U- structure demonstrates its arched <br />design. <br />The U- Structure is very stable and will accommodate high volume /high velocity flows. The <br />structure features an arched shape laid in the plane defined by the riverbed with its footing <br />sunk into the riverbank, as shown in Figure 7, to bear these loads. The arch is a classic <br />support structure that dates back to Roman civilization. This structure has two properties <br />that make it desirable for in- stream use. The first is that it is extremely strong and stable. <br />This structure can sustain very high and very imbalanced loads without becoming unstable. <br />The second property of arches that makes them desirable for in- stream use is that all stresses <br />induced in the arch due to external loading on the top face are compressive. This property, <br />along with the general design and layout of the structures, allows REP to construct <br />structures with limited tensile strength, thereby removing the need for dangerous rebar and <br />removing the risk that failure of the structures could ever result in a cohesive plate being <br />washed downstream. <br />OZ! <br />