Laserfiche WebLink
<br />Vegeutlon - <br /> <br />e <br /> <br />Costs per square yard typically varies from $6 to $15 including labor, seed, materials, <br />and equipment. Cost can vary depending on the anchoring system and the types of <br />vegetation employed. <br /> <br />Geogrid Wall - The term "Geogrid Wall" refers to structures using googrid to function <br />as a retaining biostabilization wall that permits vegetation and growth. Piles consisting <br />of timber posts are placed along the edge of the bank. Cables are secured to the top and <br />middle of the piles, and a deadman anchor is placed to anchor the piles. The googrid, or <br />goosynthetic fence, is attached to the backside of the piles and to the cables <br />interconnecting the piles. The geogrid wall is designed to contain a backfill consisting of <br />incremental layers of willow bundles (wattles) and soil. The wattles are treated with <br />appropriate growth hormones to allow for growth of the willows from the initial bundle <br />environment out through the holes in the geogrid to create a natura11y aesthetic visage. <br />Ultimately, the vegetation root mass provides stability to the embankment, even after <br />the piles and googrid deteriorate. <br /> <br />TImber and Vegetation Bulkheads - TImber and vegetation bulkheads, shown in Figure <br />4 . 19, are timber wall ~ilization structures that are constructed along the bank of a <br />river approximately para1IeI to the direction of cwrent flow. The structure consists of <br />timber logs placed horizontally along the toe of the bank forming a wall of relatively <br />low height. Tunber piles provide lateral support for the wall. A soiVspaII mixture is used <br />to backfill and cap the structure. The ground above the bench is sloped and vegetation is <br />e~lished there as well. <br /> <br />FIGURE 4 -19 <br /> <br />Timber and vegetation bulkhead <br /> <br /> <br />N.w.S. <br /> <br />ree <br /> <br />. <br /> <br />Colorado Erosion Control Manual <br /> <br />51 <br />