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<br />- ~, . q .'. , <br />lJJ~JJ't <br /> <br /> <br />Figure 2. A top view of a 3-D computer model of a V-structure demonstrates its arched design. <br /> <br />This structure is very stable and will accommodate high volume/highvelocityflows. 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 structure 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 imbalanced 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 />to extemalloading on the top face are compressive. <br /> <br />-7- <br />