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25 <br />RP (Reservoir, Primary). Reservoir on 4th order or larger permanent <br />stream. <br />RS (Reservoir, Secondary). Reservoir on 3rd order or smaller <br />permanent stream. <br />RT (Reservoir, Tertiary). Reservoir on ephemeral tributary stream. <br />~I (Offstream Impoundment). Excavation isolated from the river <br />channel. <br />II. Specific Habitat <br />BA (Backwater). A body of water off the main channel with no <br />measurable velocity, of ten created by a drop in water level <br />which partially isolates a former secondary channel or by <br />high water levels which flood low-lying areas. <br />ED (Eddy). Whirlpools or turbulent backcurrents created by <br />obstructions or islands in the channel or by the juncture of <br />two channels below an island. <br />P~ (Pool). A portion of stream that is deep and quiet relative <br />to the main current. <br />RI (Riffle). A shallow rapids in open river where the water <br />surface is broken into waves by obstructions or irregular <br />substrate wholly or partially submerged. <br />RU (Run). A stretch of relatively deep fast-flowing water with <br />the surface essentially nonturbulent. <br />SH (Shoreline). The shallow, low to negligible velocity waters <br />next to shore. <br />RA (Rapid). A relatively deep and fast flowing area characterized <br />by standing waves and whitewater caused by channel constriction <br />or obstructions. <br />RF (Rubble Flat). Quiet water areas of large substrate particle <br />size, with same silt deposition. Typically associated with <br />island heads and chute channels, but may be located elsewhere. <br />EM (Embayment). Shoreline concavities or depressions often <br />created by shoreline obstruction or irregular substrate and <br />associated with iow velocity shoreline backcurrents. Length <br />greater than width at mouth. <br />C~ (Concavity). Similar to EM except width at mouth greater than <br />___.. length. <br /> <br />