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Florida Erosion and Sediment Control Inspector's Manual <br /> wired directly to the posts with all other provisions of item No . 6 applying . <br /> 8 . When attaching two silt fences together, place the end post of the second fence <br /> inside the end post of the first fence . Rotate both posts at least 180 degrees on a <br /> clockwise direction to create a tight seal with the filter fabric. Drive both posts into the <br /> ground and bury the flap . (See Plate 4 .068 ) <br /> 9 . The trench shall be backfilled and the soil compacted over the filter fabric. <br /> •• 10 . The most effective appliction consists of a double row of silt fences spaced a minimum <br /> of three feet apart. The three foot separation is so that if the first row collapses it will <br /> not fall on the second row. Wire or synthetic mesh is may be used to reinforce the first <br /> row. (See Plate 4 . 06c) <br /> 11 . When used to control sediments from a steep slope , siltfences should be placed away <br /> from the toe of the slope for increased holding capacity. (See Plate 4 .06f) <br /> 11 . Silt fences shall be removed when they have served their useful purpose , but not <br /> before the upslope area has been permanently stabilized . <br /> Channel Flow Applications <br /> dw <br /> 1 . If a filter barrier is to be constructed across a ditch line or swale , the barrier shall <br /> be of sufficient length such that the bottom of the end sections of fence are higher <br /> in elevation than the top of the center section to eliminate end flow . The plan <br /> configuration shall resemble an arc or horseshoe with the ends oriented upslope . <br /> (See Plate 4 . 06b) . <br /> 2 . Use FDOT Standard Index 102 , Chart 1 ( Plate 4 . 06a ) as a guide for spacing . <br /> 3 . The remaining steps for installing a filter barrier for sheet flow applications apply here . <br /> Maintenance <br /> 1 . Silt fences and filter barriers shall be inspected immediately after each rainfall and <br /> at least daily during prolonged rainfall . Any required repairs shall be made <br /> aw immediately . <br /> aw 2 . Should the fabric on a silt fence or filter barrier decompose or become ineffective <br /> before the end of the expected usable life and the barrier still be necessary, the <br /> fabric shall be replaced promptly. <br /> aw <br /> 3 . Sediment deposits should be removed after each storm event. They must be <br /> removed when deposits reach approximately one-half the height of the barrier. <br /> OW <br /> 4-28 <br />