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Installation <br />Numerous erosion control mats currently exist. Erosion control products should <br />always be installed in accordance with the manufacturer's instructions. The following list <br />contains basic applications of erosion control mats: <br />Erosion control fabrics are especially useful for steep slopes. Erosion <br />control fabrics may be applied perpendicular or horizontal to the slope <br />contour lines, depending upon the slope length and width. However, they <br />should always be placed in the direction of the water flow in ditch <br />installations. <br />2. Prior to netting placement, an anchor trench (of no less than 6" deep and <br />6" wide) should be dug at the top and toe of the slope. The top trench <br />should be placed one foot back from the slope crown, creating a berm <br />over which the fabric can be placed and securely buried. <br />3. For horizontal application, the erosion-control fabric should be tucked <br />into the top trench, stapled, and covered with topsoil. The material is then <br />unrolled and stapled as the work proceeds. The strips should have a four- <br />inch overlap and lay like house shingles. Enough netting should be in the <br />trench at the bottom of the slope to secure it with staples and bury it with <br />soil. <br />4. Over soils with extreme surface roughness, the netting should not be <br />stretched, but allowed to lay loosely on the surface. Staples or rocks may <br />need to be placed in the bottom of depressions so that the netting does <br />not stretch over the pocks. When dealing with steep slopes, start at the <br />bottom and roll uphill to prevent stretching. <br />5. Staple spacing is dictated by product, slope and soil conditions. See <br />manufactures recommendation for staple spacing. <br />6. Where extremely erodible soil conditions are anticipated, a tamped:. <br />trench should be placed at the midpoint of the slope. The compact. <br />material should be stapled every 9 to 12 inches along <br />the center of the trench, filled with topsoil, and tamped thoroughly. <br />Problems may occur if: <br />¦ Areas are left uncovered or with inadequate coverage, resulting in erosion, <br />washout, and poor plant establishment. <br />¦ There is inadequate anchoring at the top of the slope. <br />¦ An insufficient amount of staples are applied, the staples are not correctly <br />spaced, or the surveying stake is not used in loose soil. These <br />conditions may result in the netting being lost to wind and runoff. <br />¦ Deer hooves get caught in netting and pull the netting up. <br />1 17 ,