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<br />VEGETATION <br /> <br /> <br />( ~::r- <br /> <br />--""",.."...~ . ,I~'.'::';".;~;":,,.- <br /> <br />--~ <br /> <br />~- <br />"--~~ <br /> <br />~- <br /> <br />ffi.!'L- <br /> <br />I ~---~ <br />"------ <br /> <br />,,--Water Toleranf <br />Plantin!ls <br /> <br />Normal <br />Wafer SurFace <br /> <br />TYPICAL SECT/ON <br /> <br />Vegetat Ion 15 an economfca I method of limited streambank ercs Jon protect Ion. The <br />pr incJpa I functions of vegetation are to keep fast-movJ 09 water and transported coarse <br />materials away from the surface of a stream bank slope and Improve the structural Integrity <br />of the bank. The topsoil of the bank to be protected Is generally stripped for weed <br />control. Grass can be planted by SOdding, sprigging, or by spreading of mulches <br />consisting of seed, fertilizer, and other organic mixtures. In addition, various <br />hydrophytlc plants, e.g., willows may be used. Woody plants have a greater Initial cost <br />and longer time to become establ fshed than grass" but are roore effective for long-term <br />protection. For sections of a streambank where scour Is a problem, woody plants <br />estab II shed at the toe of the s lope and grass above the toe have proven to be good <br />protection. Trees raised in nurseries are preferred over local plants because they are <br />usually healthier, bushier, and have better developed root systems at maturity. <br /> <br />ADVANTAGES: <br /> <br />1) <br /> <br />Low cost. <br /> <br />, <br /> <br />2) <br /> <br />Little maintenance. <br /> <br />3) <br /> <br />Environmentally acceptable. <br /> <br />DISADVANTAGES: 1) <br /> <br />limited protection for serious erosion problems. <br /> <br />23 <br />