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<br />Armorlng Technique. . <br /> <br />e <br /> <br />the bank with cables attached 10 deadman. They prevent erosion by reducing cmrent <br />velocity adjacent 10 the bank and by promoting sediment accretion on the eroding bank. <br /> <br />Woody vegetation used for brush and tree reveUoents provides good riparian and <br />aquatic habitat and a natural look: that is aesthetically superior 10 artificial materials. If <br />sediment accretion is not excessive, fishery habitat along the bank is improved. <br /> <br />Brush and tree revetments, shown in Figure 4 - 10, have been used throughout the U.S. <br />and Europe 10 control slope and slreambank erosion caused by scour. They are <br />particularly suited 10 rivers with low banks and an abundant supply of local trees. <br />Properly installed brush and tree revetments have perfonned well in most cases, <br />especially on small streams. Most failures appear 10 result from improper installation, <br />particularly in anchoring. Again, construction is very labor intensive and is the major <br />factor that influences cost Material cost range from $10 - $60 per linear foot. <br /> <br />FIGURE 4 -10 <br /> <br />Tree and Brush Revetment <br /> <br /> <br />High Bankline <br /> <br />Flow ...- <br /> <br />I <br /> <br /> <br />Cable Retainer <br /> <br />Clam <br />Cable <br /> <br />Existing <br />Bankline <br /> <br />Varies <br />V~ . <br />Vanes <br />l <br /> <br />. <br /> <br />Colorado Erosion Control Manual <br /> <br />37 <br />