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<br />Chapter 4-Site-Specific Industrial Storm Water BMPs <br />r1 <br />?J <br />When and Where to Use Them <br />Mulching is often used alone in areas where temporary seeding cannot be used because of the <br />season or climate. Mulching can provide immediate, effective, and inexpensive erosion control. On <br />steep slopes and critical areas such as waterways, mulch matting is used with netting or anchoring <br />to hold it in place. <br />Mulch seeded and planted areas where slopes are steeper than 2:1, where runoff is flowing across <br />the area, or when seedlings need protection from bad weather. <br />What to Consider <br />Use of mulch may or may not require a binder, netting, or the tacking of mulch to the ground. <br />Effective netting and matting require firm, continuous contact between the materials and the soil. <br />If there is no contact, the material will not hold the soil and erosion will occur underneath the <br />material. Final grading is not necessary before mulching. Mulched areas should be inspected often <br />to find where mulched material has been loosened or removed. Such areas should be reseeded (if <br />necessary) and the mulch cover replaced immediately. Mulch binders should be applied at rates <br />recommended by the manufacturer or, if asphalt is used, at rates of approximately 480 gallons per <br />acre (Arapahoe County, 1988). <br />• Advantages of Mulching, Matting, and Netting <br />• Provide immediate protection to soils that are exposed and that are subject to heavy <br />erosion <br />• Retain moisture, which may minimize the need for watering <br />• Require no removal because of natural deterioration of mulching and matting <br />Disadvantages of Mulching, Matting, and Netting <br />• May delay germination of some seeds because cover reduces the soil surface temperature <br />• wetting should be removed after usefulness is finished, then landfilled or composted <br />4 -6 1