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Chapter 4 - Best Management Practices for Erosion and Sediment Control <br /> 1 . Wire mesh shall be laid over the drop inlet so that the wire extends a minimum of one <br /> foot (30 cm ) beyond each side of the inlet structure . Hardware cloth or comparable ' <br /> wire mesh with 1 /2 inch ( 13 mm) openings shall be used . If more than one strip of <br /> mesh is necessary, the strips shall be overlapped at least 1 ft . (30 cm ) . <br /> 2 . FDOT No . 1 Coarse Aggregate ( 1 . 5" to 3 . 5" stone) (4 - 9 cm ) shall be placed over <br /> the wire mesh as shown on Plate 4 . 08c. The depth of stone shall be at least 12 <br /> inches (30 cm ) over the entire inlet opening . The stone shall extend beyond the <br /> inlet opening at least 18 inches (45 cm ) on all sides . (See Plate 4 . 08f) <br /> 3 . If the stone filter becomes clogged with sediment so that it no longer adequately <br /> performs its function , the stones must be pulled away from the inlet, cleaned and <br /> replaced . <br /> r <br /> NOTE : This filtering device has no overflow mechanism . Therefore, ponding is likely <br /> especially if sediment is not removed regularly. This type of device must never be used where <br /> overflow may endanger an exposed fill slope . Consideration should also be given to the <br /> possible effects of ponding on traffic movement, nearby structures , working areas , adjacent <br /> property, etc. <br /> 167 MIN . --► <br /> GRAVEL ( 12" MIN . DEPTH ) <br /> RUNOFF WATER <br /> WITH SEDIMENT , <br /> - � - 44 <br /> O tl <br /> Q <br /> WIRE MES'r rr <br /> SEDIMENT <br /> FILTERED <br /> WATER <br /> S pe odic Arawia atien <br /> T9is method of inlet protection is *applicabla whare hoavy ccnoentratad flows are expected, but no: where ponding <br /> around the etructurs might cal:sa excessive incor fence or damage to adjacent strurturas and unprotected areas . <br /> Giaual Shall tie VDOT S81 *357, or Ns Coarse Aag"ta. <br /> Plate 4. 08f Gravel and Wire Mesh Drop Inlet Sediment Filter <br /> Source: Virginia DSWC <br /> r� <br /> 4-41 <br />