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• <br />• <br />Plan View A <br />Drain <br />Grate <fo? � oO���° o� o oo a°oo <br />ao �ao04 °o oo a6(M °o o�o� oo°o <br />o°o opO�4�o°ado°vO�4�oao04O°o ° <br />0\o °o°DOo °ooDO v \Jo 3�`io <br />aoO�a�oo o QoOo° 000 Concrete <br />°0 6a1 c)o�o° oo Block <br />o°ap�°oD�o <br />go.�o°°o a Ooo <br />o Oa �o o°o �aoo <br />oo <br />° ° <br />° v o o <br />ooloJ°��-°o°° Gravel <br />e0 �ao O �o Backfill <br />0— <br />O °o°DO4�°op O � Z" °o O <br />Ooao��a .0 '°o �-61 ��o �� <br />oo�oo �'o\\o O o000 �oe�ooa°o <br />�. °000C) �00 �° oDO <br />e5°�c��°Q� A <br />� �X'o <br />Section A - A Concrete Block Wire Screen or <br />Filter Fabric <br />Gravel Backfill � Overflow <br />Water Ponding Height <br />000 c <br />oo DBo� Water �°oC <br />°o o 00 0°0 <br />\\\\\/ \\\ Drop Inlet \\\\\\\\\\ <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 structure. <br />CSC <br />Figure 4.2.8 — 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 />• Use a hardware cloth or comparable wire mesh with 1/2-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 />Volume II —Construction Stormwater Pollution Prevention -August 2012 <br />4-82 <br />Figure 4.2.8 — 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 />• Use a hardware cloth or comparable wire mesh with 1/2-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 />Volume II —Construction Stormwater Pollution Prevention -August 2012 <br />4-82 <br />