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Flow regimes have important long -term effects on a river's <br />biophysical characteristics such as aquatic habitat, but <br />flows also affect fishability" or `angler habitat." Studies <br />can define flow needs far different types of <br />fishing opportunities. <br />Right: Oregon's Upper Klamath River at 350 cfs. <br />Many early flow- recreation studies <br />focused on whitewater boating, an <br />activity where flows have dramatic <br />effects. Flows determine whether a river <br />is runnable by boaters with different <br />skills or craft, and affect the size and <br />power of hydraulics that create interest- <br />ing whitewater. <br />Left: Faraday Diversion Reach on <br />Oregon's Clackamas River at 1,220 cfs. <br />