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Figure 11-3.17: Block and Gravel Filter <br /> Drain grate cfg°4'Dp 24 ° p y� <br /> 400a° �po 01 <br /> Oo�K7000 `'p° ' ••';r�oboo <br /> go - �o°•0►, A64;Al. clop Concrete block <br /> Cat <br /> °.4•°°�'�.Uo <br /> - - a• o� 0 <br /> d <br /> •'" C?�-°QgOix- Gravel backfill <br /> °•• f P <br /> °O d•ao <br /> �4 •ag Jf�so <br /> � 6;0Q0°pa opQoQ�oo° ° Off. <br /> Q� �0 oved ow6td ,+..ne:g90, <br /> ®5 c,,OI.J.tko <br /> O <br /> Plan View <br /> Concrete block <br /> Wire screen or <br /> filter fabric <br /> Gravel backfill -"Overflow <br /> water Ponding height <br /> �•„•o Je `4©Water m�n *•+!!; 0. <br /> / •f /\�/\ � i� r, r, r, r.Dui ,/\\ \f\//>\//>V\ <br /> /\/�\/j�/\\�/ Drop inlet %\ <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 /> ftr11011111 <br /> 1111 Block and Gravel Filter <br /> Revised June 2016 <br /> DEPARTMENT OF <br /> ECOLOGY Please see http://www.ecywa.gov/copyright.html for copyright notice including permissions, <br /> State of Washington limitation of liability,and disclaimer. <br /> 2019 Stormwater Management Manual for Western Washington <br /> Volume ll-Chapter 3-Page 359 <br />