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<br />, .. <br /> <br />Each U-structure is followed by a self-seauring pool. These structures are designed to <br />diver.t'and control the flow at specific points to create surfwaves, rodeo holes, standing waves, <br />eddies, and jets of water for squirt boating. As water flows increase, these wave forms become <br />larger, more powerful, and conducive to the sport ofwhitewater rodeo, play-boating, and slalom <br />racing. As demonstrated in Figure 1 J the structures in these boating parks are massive structures <br />built of large stone, grouted together with concrete, that span the entire channel and are anchored <br />weli into the' bed and banks of the river. They are designed to divert and control water to create <br />boating features. particularly at high flows. Obviously, very high flood flows are not considered <br />as normal boating flows. The 'course was designed, however, to withstand the impact of high <br />flood flows. . <br /> <br /> <br />Figure I. The U-structure is created from rock and grout laid in the riverbed for flow control and <br />the creation of a recreational boating featQ.re. <br /> <br />-8- <br />