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Chapter 4 - Best Management Practices for Erosion and Sediment Control <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 syntheticfilter <br /> fabric. It is designed for low or moderate flows not exceeding 1 cfs . (0.03 m3 / 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 /> r <br /> 2 . Burlap or standard strength synthetic filter fabric shall be purchased in a continuous <br /> roll and cut to the length of the barrier to avoid the use of joints (and thus improve <br /> the 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 shall be excavated approximately 4 inches ( 10 cm) wide and 4 inches ( 10 <br /> cm) deep along the line of stakes and upslope from the barrier. <br /> 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 /> stapled to existing trees . <br /> 6 . The trench shall be backfilled and the soil compacted over the filter material. <br /> 7. Filter barriers shall be removed when they have served their useful purpose, but not <br /> before the upslope area has been permanently stabilized . <br /> r <br /> Sheet Flow Application : Silt Fence <br /> This sediment barrier uses standard strength or extra strength synthetic filter fabrics . It is <br /> designed for situations in which only sheet or overland flows are expected . (See Plate <br /> 4. 06d ) <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 /> 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 />