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Plan View A <br /> Drain <br /> Grate �o�o o� o�� w 0`,6)o�� �°P <br /> ao�a0� 000°00 ° OC) °o O°oo oa0O°0° <br /> °° <br /> °*0 OoO�Q�o°4�o O�a�od �°�,o <br /> l'qb°,, <br /> �o�-yo� o to o O° 040 <br /> oo°OLJo°O�° Ooo0�°o��o° oC-7vso e�poo0.O4 <br /> ao0�4°° 4'o.Q° .q.*o Concrete <br /> 6,..c).„.80--,;‘, °° o Block <br /> oD d o90 o°,(2--,:'() °,-, <br /> C> <br /> �o° o °aW0 ° O <br /> ��°oo�4 °Q�o 0�4 <br /> o�° °o aOo° o0 Gravel <br /> 2cA, o 1��o° o Backfill <br /> OR°,opOO noo oo .-41 p tQ =j c..°°°�O <br /> 0°.(Pon�00° as-.6'0`000��o��o°0�4 <br /> Ooa sJOo oOo°.coed Oo 9a`�Q o0) <br /> 0 c8 CJS° o .,,..,,,,,,;__cc,‹ <br /> a� °�°o00�°00°0° oo ° <br /> r <br /> cz, co <br /> A <br /> <0 <br /> Section A - A Concrete Block Wire Screen or <br /> Filter Fabric <br /> Gravel Backfill Overflow <br /> Water Ponding Height <br /> 0 <br /> 0OaoOh Water� _,- �0C� o0 <br /> °oo,i ° <br /> \ /i\� � \ Drop Inlet \ \/i\/i\ <br /> /<\/j .\//i// <br /> Notes: <br /> 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 may be necessary on the dowslope side of the structure. <br /> Figure 4.14-Block and Gravel Filter <br /> Gravel and Wire Mesh Filter- A gravel barrier placed over the top of the <br /> inlet. This structure does not provide an overflow. <br /> • Hardware cloth or comparable wire mesh with 1/4-inch openings. <br /> • Coarse aggregate. <br /> • Height 1-foot or more, 18 inches wider than inlet on all sides. <br /> • Place wire mesh over the drop inlet so that the wire extends a <br /> minimum of 1-foot beyond each side of the inlet structure. <br /> • If more than one strip of mesh is necessary, overlap the strips. <br /> • Place coarse aggregate over the wire mesh. <br /> • The depth of the gravel should be at least 12 inches over the entire <br /> inlet opening and extend at least 18 inches on all sides. <br /> 4-84 Volume II-Construction Stormwater Pollution Prevention February 2005 <br />