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Chaater.4 -. Best Management Practices for Erosion and 4.07 BRUSH BARRIER_ (ES BMP 1.07) r - Definition A temporary sediment barrier constructed at the perimeter of a disturbed area from the residue materials available from clearing and grubbing the site. " Pur ose To intercept and' retain sediment from .disturbed areas of limited extent, preventing sediment from leaving the site. Condit'sons Where Practice Applies ` Below disturbed areas subject to sheet and rill erosion, where enough residue material is available for construction of such a barrier. r 0 Planning Considerations. Organic litter and spoil material from site clearing operations is usually burned or hauled away to be dumped elsewhere. Much of this material can be used effectively on the construction site itself. During clearing and grubbing operations, equipment can push or dump the mixture of limbs, small vegetation and root mat along with minor amounts of soil and rock into windrows along the toe of a slope where erosion and accelerated runoff are expected. Anchoring 'a filter fabric over the berm enhances the filtration ability of the barrier. Because brush barriers are fairly stable and composed of natural materials, maintenance requirements are small. Desna_ n_ C'r�a A formal design is not required. Construction Specifications:: The height of a brush barrier shall be a minimum of 3 feet (90 cm). The width of a brush barrier shall be a minimum of 5 feet (1.5 m) at its base. (The sizes of brush barriers may vary considerably based upon the amount of material available and ttie judgment of the design engineer.) The barrier shall be constructed by piling brush, stone; root mat and other material from the clearing process into a mounded row on the contour. If a Ater fabric is used (Plate 4.07a): y across the arrier from.its 4 The filter fabric shall be cut upslope base to just beyond its peak.lengthsnto Where joints are necessary, the fabric hall r 4-31