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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 shall 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 of�ciency 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 /> 4-25 <br /> r <br />