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<br />general public Interest.. for the accomplishment of certain works on or adjacent to <br />navigable waters of the UnIted States. <br /> <br />Pile. An elongated member.. usually made of timber.. concrete.. or steel, that serves as a <br />structural component of a river traIning structure. <br /> <br />Revetment. Armor of erosion-resistant material desIgned to protect a streambank. <br /> <br />River TralnlnQ Structure. Any configuration consTrUCTed in a stream or placed on, <br />adjacent to, or In the vicinity of a streambank, which is Intended to deflect <br />currents, induce sediment deposition, induce scour, or in some other way alter the <br />velocity regImen of the stream. <br /> <br />SpecificatIons. <br />materIals, <br /> <br />A detailed descrIption of particulars, such as size of stone, quality of <br />contractor performance, terms, qual ity control, etc. <br /> <br />Stone Rlprap. Natural cobbles, <br />streambank or filter as armor <br /> <br />boulders, or broken <br />against erosion. <br /> <br />stones <br /> <br />dumped or placed on a <br /> <br />Toe. That portion of a stream cross-section where the lower bank termInates and the <br />channel bottom or the opposite lower bank begins. <br /> <br />Trench-FII I Revetment. Stone.. concrete, or <br />and paral lei to an eroding streambank. <br />the trench.. the material placed in the <br /> <br />ceramIc material placed in a trench dug behind <br />When the erosive action of the stream reaches <br />trench retards further erosIon. <br /> <br />Upper Bank. That portion of a streambank having an elevation greater than the mean water <br />level of the stream. <br /> <br />Veqetatlon. Woody or nonwoody plants used to stabilize a streambank and retard erosion. <br /> <br />32 <br /> <br />*u. S. GOVERNMENT PRINTING OFFICE, 1980-652.712 <br />