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Chapter 4-Site-Spec&ndustrial Storm Water BMPs 0 <br />Mulching, Matting, and Netting <br />[What Are They <br /> <br />Mulching is a temporary soil stabilization or erosion control practice where materials such as grass, <br />hay, woodchips, wood fibers, straw, or gravel are placed on the soil surface. In addition to <br />stabilizing soils, mulching can reduce the speed of storm water runoff over an area. When used <br />together with seeding. or planting, mulching can aid in plant growth by holding the seeds, fertilizers, <br />and topsoil in place, by preventing birds from eating seeds, helping to retain moisture, and by <br />insulating against extreme temperatures. Mulch mattings are materials (jute or other wood fibers) <br />that have been formed into sheets of mulch that are more stable than normal mulch. Netting is <br />typically made from jute, other wood fiber, plastic, paper, or cotton and can be used to hold the <br />mulching and matting to the ground. Netting can also be used alone to stabilize soils while the <br />plants are growing; however, it does not retain moisture or temperature well. Mulch binders (either <br />asphalt or synthetic) are sometimes used instead of netting to hold loose mulches together. <br /> <br />FIGURE 4.13 ORIENTATION OF MULCH NETTING AND MATTING <br />(Modified from County of Fairfax, 1987) <br />• <br />4-60