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BMP C121: Mulching Purpose The purpose of mulching soils is to provide immediate temporary I I I I I protection from erosion. Mulch also enhances plant establishment by conserving moisture,holding fertilizer, seed, and topsoil in place, and moderating soil temperatures. There is an enormous variety of mulches that can be used. Only the most common types are discussed in this section. Conditions of Use As a temporary cover measure, mulch should be used: I I . On disturbed areas that require cover measures for less than 30 days. I • As a cover for seed duringthe wet season and duringthe hot summer months. • During the wet season on slopes steeper than 3H:1 V with more than 10 feet of vertical relief. II . Mulch may be applied at any time of the year and must be refreshed periodically. Design and For mulch materials, application rates, and specifications, see Table 4.7. I Installation Note: Thicknesses may be increased for disturbed areas in or near Specifications sensitive areas or other areas highly susceptible to erosion. IMulch used within the ordinary high-water mark of surface waters should be selected to minimize potential flotation of organic matter. Composted organic materials have higher specific gravities (densities) than straw, wood, or chipped material. I Maintenance • The thickness of the cover must be maintained. I Standards • Any areas that experience erosion shall be remulched and/or protected with a net or blanket. If the erosion problem is drainage related, then the problem shall be fixed and the eroded area remulched. 4-20 Volume ll—Construction Stormwater Pollution Prevention February 2005