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Plan View A <br /> Drain o� p <br /> Grate <br /> '6^ g- � 0 ado�d`'o� <br /> q\a0o� n a a Q•r7 aa0 <br /> ° � <br /> dc�C� o ° ���q ao d Concrete <br /> 0 �oJo a. 0 81ock <br /> 0 <br /> C� as aOD�o o Gravel <br /> 0 i3acldill <br /> ao0a "moo 'Pa P�� �4��d���•�QOo Q oQ��,��'i'Q4� <br /> oO <br /> A <br /> Section A — A Concrete Block Wire Screen or <br /> Filter Fabric <br /> Gravel Backtill �?Overflow / <br /> Water / Ponding Height <br /> O,O � <br /> of;o ­--'I T <br /> Xprop Inlet %\%\/N <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 downslope side of the stniettire. <br /> Figure 4.2.8-- Block and Gravel Filter <br /> Gravel and Wire Mesh Tiller-A gravel barrier placed over the top of the <br /> inlet. This structure does not provide an overflow. <br /> • Use a hardware cloth or comparable wire mesh with %-inch openings. <br /> • Use coarse aggregate. <br /> • Provide a height 1-foot or more, 18-inches wider than inlet on all <br /> 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 /> Overlap the strips if more than one strip of mesh is necessary. <br /> Vohnne H—Construction Sto;niwater Pollution Prevention-Augusl 2012 <br /> 4-82 <br />