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• <br />Overflow Channel <br />High Flow Channel <br />Low Flow Channel ` <br />A"? <br />.?_ .- --? ti ._..--- - -?-- . . . '`` ;- . ? - - • ? - ? <br />. . . . <br />:._ ???`(?`.f???t?`?` ..? ?,?.°.i.... <br />. . . <br />..,..? ?.....__ - -?- - . .. . ._ . . <br />. ?.. .__ __.-...._ <br />Figure 4. The downstream view of the U-structure shows how it is designed to accommodate <br />varying flow levels. <br />Appropriateness of Reach <br />The CWCB, in their document Recreational In-Channel Diversion ("RICD") Policy <br />Regarding Technical Criteria (2003), states that a reach of stream is appropriate for a whitewater <br />• park if the Power Index (P.I.) is greater than 75. <br />At the three planned drops the P.I. at 100 cfs is 75 . At 600 cfs the PI is 450 . Again, a <br />P.I. of over 75 would exist at all flows in between 100 and 600 cfs. <br />Other considerations also suggest that the Whitewater Course is in an ideal location: <br />• It is located close to the central business district of Siverthorne and is situated such <br />that visitors to the park will use the central commercial district and benefit the <br />Town's economy. <br />• Parking and other facilities are located near the park to accommodate visitors <br />Whitewater Recreation Flows <br />The primary purpose of the Whitewater Course is to provide a whitewater recreation <br />experience for kayaks and other whitewater craft. Water at high flow rates (600-1,200 cfs) will <br />be controlled and diverted throughout the Whitewater Course and will not be wasted. The <br />waveforms, hydraulics, eddies, and holes become powerful enough at this flow to be conducive <br />to play-boating, slalom boating, and squirt boating. (See Figure 5.) This flow (600-1,200 cfs) is <br />• <br />-8-