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I <br /> Figure 11-4.2.8 Block and Gravel Filter I <br /> I <br /> Drain grate (> ``yy ,.moo <br /> Roo .. �. 1.r :,ate. 1.s;F' 0 �;.G <br /> ",--,,�° 'v}�l a j .' ,"16°.... so4',�-i.lf-. . G a° Concrete block. <br /> °cs .ram 4�.�L�`.'-, "". \..,s,'\` ,,,. <br /> ,;U i� (----'3,,,,,; ,a{'j Gravel backfill II <br /> 4),Q,0 ,0 _( �'bL <br /> , : D iv°" 4 <br /> ;-'0 �M30 , '� <br /> '-i 7 4. a ''i S s Vic:F.:.'c. . °L,v^'a <br /> I <br /> e. <br /> `h�° . A <br /> Plan View I <br /> Concrete block <br /> Wire screen or <br /> Gravel backfill __�,_Overflow filter fabric <br /> water Ponding height _ <br /> xM3° - : I <br /> V,`%: . ""` i ,ice.`-- '' �iai,.: , V, <br /> Y.W. \ \ Drop inlet \\/�\��; /\ I <br /> f llj����‹ 4. ' /,\,%'//4 <br /> f\ \ ;/.,/. <br /> Section A-A I <br /> Notes: <br /> 1, Drop inlet sediment barriers are to be used for small,nearly level drainage areas.(less <br /> than 5%) <br /> II <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 <br /> downslope to prevent runoff from bypassing the inlet.A temporary dike may be <br /> necessary on the downslope side of the structure, <br /> NOT TO SCALE <br /> iiiiiiiiill�� Figure 11-4.2.8 <br /> "IiiiiiiiilBlock and Gravel Filter <br /> DEPARTMENT OF Revised August 2015 <br /> ECOLOGY Please see http://www.ecy.wa.gov/copyright.htmt for copyright notice including permissions, I <br /> State of Washington limitation of liability,and disclaimer. <br /> I <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume II- Chapter 4 -Page 360 1 <br />