Laserfiche WebLink
the velocity and power of the water. By adjusting the gradient of the flow over the U -drop a <br />wave or hydraulic can be formed. The structure also features elevated wings that are positioned <br />along both riverbanks. These wings provide an eddy for easy recirculation to the wave. This <br />structure is also beneficial to the in- stream habitat. The gradient of the drop keeps a pool below <br />the structure scoured and creates habitat for fish and aquatic life. <br />Figure 3. A top view of a 3 -D computer model of a U- structure demonstrates its arched <br />design. <br />This structure is very stable and will accommodate high volume/high velocity flows. <br />The 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 3, 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 external loading on the top face are compressive. <br />11 <br />