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Chapter 4.- Best Management Practices for Erosion and Sediment Control <br />r <br />5, Wire fence reinforcement for silt fences using standard strength filter cloth shad be <br />a minimum of. 36 inches (90 cm) in height, a minimum of 14 gauge and shall have <br />a maximum mesh spacing of 6 inches (15 cm). <br />Sheet Flow Applications: Filter Barrier <br />This sediment barrier may be constructed using burlap or standard strength 3yntheticfiiter <br />fabric. It is designed for. low or moderate flows not exceeding 1 cfs. (0.03 m / sec.). (See <br />• Plate 4.06b) <br />1. The height of a filter barrier shall be a minimum of 15 inches (38 cm) and shall not <br />�++ exceed 18 inches (45 cm). <br />2. Burlap or standard strength synthetic filter fabric shall be purchased in a continuous . <br />• roiland cut to the length of the barrier to avoid the use of joints (and thus improve <br />I strength and efficiency of the barrier). <br />• 3. The stakes shall be spaced a maximum of 3 -feet (90 cm) apart at the barrier <br />location and driven securely into the ground a minimum of 8 inches (20 cm). <br />.► < 4, A trench shalt/ be excavated approximately 4 inches (10 cm) wide and 4 inches (10 <br />cm) deep along the line of stakes and upsiope from the barriei. <br />+r 5. The filter material shall be stapled to the wooden stakes, and 8 inches (20 cm) of <br />the fabric shall be extended into the trench. Heavy duty wire staples at least 1/2 <br />inch (13 mm) long, hog rings, or tie wire shall be used. Filter material shall not be <br />r stapled to existing trees. <br />6. The trench shall be backfilled and the sail compacted over the filter material. <br />r <br />7. Filter barriers shalt be removed when they have served their useful purpose, but not <br />before the upslcpe area has been permanently stabilized. <br />•r <br />Sheet Flow Application: Slit Fence <br />• This sediment barrier uses standard strength or extra strength synthetic filter fabrics. Itis <br />designed for situations in which only sheet or overland flows are expected.. (See Plate <br />4.06d) <br />r <br />1, The height of a silt fence shall not exceed 36 inches .(90 cm). Higher fences may <br />impound volumes of water sufficient to cause failure of the structure, <br />r <br />2. The filter fabric shall be purchased in a continuous roll cut to the length of the <br />barrier to avoid the use of joints. When joints are necessary, filter cloth shall be <br />spliced as described -in item No. 8 below. <br />r <br />r <br />