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Irrigation return Water entering the river from irrigation <br />flow collector system. <br />Main channel Primary river course that carries the mayor <br /> water flow throughout most of the year. <br />Pool A portion of the stream that is deep and quiet <br /> relative to the main current. <br />Riffle A shallow fast-flowing area where the water <br /> surface is broken into waves by obstructions <br /> wholly or partly submerged. <br />Run A stretch of relatively deep, fast flow with <br /> the surface essentially non turbulent. <br />Shoreline The shallow, low-to-negligible velocity waters <br /> next to shore. <br />Side channel A secondary channel which carries appreciable <br /> flow during high water and provides a low <br /> velocity habitat during low flow. <br />Substrate types <br />Silt <br />Sand <br />Gravel <br />Rubble <br />Boulder <br />Bedrock <br />Fine gritty material <br />Less than 3 mm diameter <br />3 mm to 76 mm <br />76 mm to 305 mm <br />305 mm and larger <br />Solid, continuous rock Layer <br />3" <br />