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<br />Trench-fill revetment - :3tone, concrete, or masonry material placed in <br />a trench dug beh i nd and pa,-a I I e I to an erod i ng streambank. When <br />the erosive action "f the stream reaches the trench, the material <br />placed in the trencl armors the bank and thus retards further <br />erosion. <br /> <br />Turbulence - Motion of fluids in which local velocities and pressures <br />fluctuate irregularly in a random manner as opposed to laminar <br />flow where all particles of the fluid move in distinct and <br />separate lines. <br /> <br />Upper bank - The portion of a streambank having an elevation greater <br />than the mean water level of the stream. <br /> <br />Van dikes - Structures d~signed to direct streamflow away from an <br />eroding bank I ine, but permitting I imited amounts of both water <br />and sediment to paso landward of the structure. <br /> <br />Vegetation - Woody or nonwoody plants used to stabi I ize a streambank <br />and retard erosion. <br /> <br />Velocity (of water in a utream) - The speed that water travels in a <br />given direction; expressed as a distance traveled during an <br />interval of time. <br /> <br />Watershed - See drainage basin. <br /> <br />Wave attack - Impact of waves on a streambank. <br /> <br />Windrow revetment - A row of stone (cal led a windrow) placed on top <br />bank landward of an eroding streambank. As erosion continues the <br />windrow is eventually undercut, launching the stone downslope, <br />thus armoring the bank face. <br /> <br />GPO 6:>8-433 <br /> <br />~? <br /> <br />~ <br />] <br /> <br /> <br />'\ <br /> <br />~ <br /> <br /> <br /> <br />~ <br />~ <br />) <br />