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<br />VEGETATION <br /> <br /> <br />(",-y <br /> <br />ilill~ <br />IJ~_'/' <br /> <br />c <br /> <br />~- <br /> <br />~ <br /> <br />vWater 7iJleranf <br />Planfings <br /> <br />Normal <br />Wafer SurFace <br />_'iZ.~ <br /> <br />TYPICAL 3ECT/ON <br /> <br />Vegetation Is an economical method of limited streambank erosion protection. The <br />pr IncI pa I funct Ions of vegetation are to keep fast-may' 09 water and transported coarse <br />materials away from the surface of a streambank 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, fertll izer, and other organic mixtures. In addition, various <br />hydrophytlc plants, e.g.~ wi I lows may be used. Woody plants have a greater In'Tlal cost <br />and longer time to become established than grass, but are more 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 />pro-tec1-lon. 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 />2) Little maintenance. <br /> <br />3) Environmentally acceptable. <br /> <br />DISADVANTAGES: 1) LimJted protection for serIous erosIon problems. <br /> <br />23 <br />