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Each U-structure is followed by a self-scouring pool. These structures are designed to <br />divert and control the flow at specific points to create surf waves, rodeo holes, standing w�aves, <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 of whitewater rodeo, play-boating, and slalom <br />racing. As demonstrated in Figure 1, the structures in these boating pazks are massive structures <br />built of lazge stone, grouted together with concrete, that span the entire channel and aze anchored <br />well into the bed and banks of the river. They are designed to divert and control water to create <br />boating features, paRiculazly 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 />Figure 1. The U-structure is created from rock and grout laid in the riverbed for flow control and <br />the creation of a recreational boating feature. <br />� <br />