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Figure 11-4.2.8 Block and Gravel Filter <br /> A <br /> Drain grate ru' ,\»a„r ;P,r• <br /> fir,.,', u` ,0,`:..;c:"\`r,r<•, :cP" -',•(,r,•,: Concrete block <br /> . a <br /> ^)��_�t r'� , [I ri III I][][I <br /> B--, \`'�` Gravel backfill <br /> :7 r` y c <br /> .r�,.,1. i (\i i i7.['''\^-:''' ..i <br /> D. <br /> * . — ''''''...('''''' [11]1]Iil][1 <br /> jj, 1 1f t I ?r ?n <br /> > ' I ? <br /> .fin 4: .3 \ .C`' :a...-r,c .°�•:.•"'F`'`•;j <br /> flI\ �• <br /> ,sJ,�✓ �,\�'`\Lf r<f")Cr 1C f,y(\ < �.0.r f� _ 'J <br /> �� v��'��a.�Cl���'�. �l<jai' \ irk J \:~;�a�� <br /> �5y�5 Qe r r ,. <br /> Plan View <br /> Concrete block <br /> Wire screen or <br /> filter fabric <br /> Gravel backfill -...- <br /> water Overflow <br /> Ponding height <br /> ��,,/, %1%■%■%■%■ �%/ ���,,, <br /> \\\\ . \\, \\\'\ \ \\,\\ \\\\�,;' <br /> , ' , ,,. Drop inlet / /.; <br /> \\ \\ \ '\\ \\ \\• � . <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 /> 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 /> ibrllri■ <br /> Figure 11-4.2.8 <br /> 14. 111 Block and Gravel Filter <br /> DEPARTMENT OF Revised August 2015 <br /> ECOLOGYPlease see http://www.ecy.wa.gov/copyright.html for copyright notice including permissions, <br /> State of Washington limitation of liability,and disclaimer. <br /> 2014 Stormwater Management Manual for Western Washington <br /> Volume 11-Chapter 4 -Page 360 <br />