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I <br /> IFigure II-4.2.8 Block and Gravel Filter <br /> I <br /> Drain grate <1_ u,. ; <br /> I 40 <br /> .1 1?-e }kic^: r 4— : iC P6o, " cue' Concrete block <br /> �L 5 `..^g ..> Gravel backfill <br /> 71s¢ .g4 - - 4 - .,use' <br /> !' •" 'f'''' <br /> a s w,, ,,,,.. as <br /> .,4D _A <br /> I Plan View <br /> I Concrete block <br /> Wire screen or <br /> filter fabric <br /> Gravel backfill Overflow <br /> water Ponding height <br /> c ` . <br /> •%eta°�'.\\\\\\ / \\\\\! R `°' <br /> /` ,, \; , Drop inlet \ \\ �, \ <br /> 1 <br /> Section A-A <br /> Notes: <br /> 1. Drop inlet sediment barriers are to be used for small,nearly level drainage areas.(less <br /> than 5%) <br /> I <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 /> I necessary on the downslope side of the structure. <br /> NOT TO SCALE <br /> il.►lI . III <br /> Figure 11-4.2.8 <br /> iiii�ii" - Block and Gravel Filter <br /> DEPARTMENT OF Revised August 2015 <br /> IECOLOGY Please see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions, <br /> State of Washington limitation of liability,and disclaimer. <br /> I <br /> I <br /> 2014 Stormwater Management Manual for Western Washington <br /> IVolume II- Chapter 4 -Page 360 <br />