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I <br /> I Plan View <br /> A <br /> I Grate 4a\�173 0P•e, . A is, �o `�;gg <br /> 0®0 0©o .r:eu• b0.-0 f� �o to <br /> I c ®. � Qq .0 .0. <br /> a.®. • a o�,q�,�j Concrete <br /> `• a �p _ __ o+s.8=1 Q6o ' Block <br /> Q ::ion <br /> ' e oo <br /> a <br /> Q•o°o c .° Gravel <br /> •O�,Uo o Bac <br /> k <br /> fill <br /> ®or h:oo•• .•j�`• •• �ptap .• <br /> o p•O; V act.•O-1 itod <br /> • <br /> �y Q • <br /> .0 lJ <br /> I <br /> Section A - A Concrete Block Wire Screen or <br /> I <br /> Filter Fabric <br /> Gravel Backfill Overflow <br /> Water Ponding Height <br /> Water j o <br /> /\/ // <br /> \i\jam% /\/\j\ _ \ \\j/\� j\\ \/. ` <br /> �/ \ Drop Inlet \ �\/\�\ <br /> I <br /> Notes: • <br /> I 1.Drop inlet sediment barriers are to be used for small,nearly level drainage areas.(less than 5%) <br /> 2.Excavate a basin of sufficient size adjacent to the drop inlet. <br /> 3.The top of the structure(ponding;height)must be well below the ground elevation downslope to prevent <br /> runoff from bypassing the inlet. A temporary dike maybe necessary on the dowslope side ofthe structure. <br /> IFigure 4.14—Block and Gravel Filter <br /> Gravel and Wire Mesh Filter-A gravel barrier placed over the top of the <br /> I inlet This structure does not provide an overflow. <br /> • Hardware cloth or comparable wire mesh with t%%.-inch openings. <br /> I • Coarse aggregate. <br /> • Height 1-foot or more, 18 inches wider than inlet on all sides. <br /> I . Place wire mesh over the drop inlet so that the wire extends a <br /> Iminimum of 1-foot beyond each side of the inlet structure. <br /> • If more than one strip of mesh is necessary,overlap the strips. <br /> I • Place coarse aggregate over the wire mesh. <br /> • The depth of the gravel should be at least 12 inches over the entire <br /> Iinlet opening and extend at least 18 inches on all sides. <br /> 4-84 Volume II—Construction Stormwater Pollution Prevention February 2005 <br />