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25 <br />Table 4. Descriptions of eight major habitat types on the Colorado, <br />Green and Gunnison Rivers. <br />Habitat Descri tion <br />Main Channel Primary river course that carries the <br />major water flow throughout most of the <br />year. <br />Backwater A body of water off the main channel with <br />no measurable velocity; often created by a <br />drop in water level which partially isolates <br />a former side channel or low-lying area. <br />Side Channel A side channel which carries appreciable <br />flow during high water and provides a low <br />velocity habitat during low flow. <br />Eddy A portion of the stream deeper than the <br />adjacent channel with a distinct <br />whirlpool effect. <br />Pool A portion of the stream that is deep and- <br />quiet relative to the main current. <br />Riffle A shallow fast-flowing area where the <br />water surface is broken into waves by <br />obstructions wholly or partly submerged. <br />Run A stretch of relatively deep fast, laminar <br />flow with the surface essentially non <br />turbulent. <br />Shoreline The shallow, low-to-negligible velocity <br />waters next to shore.