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n <br />t� <br />Hells Corner rapid on the Upper Klamath <br />River at 730 cfs (top) and 1,750 cfs <br />(bottom) show differences between <br />"technical" rock - dodging trips and <br />"standard" trips with better whitewater <br />and more route options. A commercial <br />rafting industry has developed here <br />because daily peaking regimes produce <br />at least 1,500 cfs on most summer days, <br />providing superb whitewater "action." <br />Lower flows are under consideration in <br />relicensing, but the boating study showed <br />that flows less than 1,300 cfs require <br />smaller boats with fewer passengers, which <br />are less commercially viable. <br />During controlled flow boating studies, participants report boatability problems such as "stops" and "boat drags." Above. At 400 cfs on <br />California's Kern River, "stuck" boats created "raft jams" as upstream boaters waited for rapids clear. At 800 cfs, boatability problems <br />were rare. <br />28 1 Flows and Recreation: <br />A Guide for River Professionals <br />