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Figure 11-3.17: Block and Gravel Filter <br />Drain grate <br />A <br />Concrete block <br />OF <br />A <br />Concrete block <br />Gravel backfill Overflow <br />water <br />Water <br />\/\\ Drop inlet <br />Section A -A <br />q Cj� Gravel backfill <br />o Jo <br />Wire screen or <br />filter fabric <br />Ponding height <br />00 _ — <br />�`, \ <br />\' <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 />Block and Gravel Filter <br />Revised June 2016 <br />DEPARTMENT OF <br />ECOLOGY Please see http:/MW.ecy.wa.gov/oopy►fghthtml for copyright notice including permissions, <br />State of Washington limitation of liability, and disclaimer. <br />2019 Stormwater Management Manual for Western Washington <br />Volume 11- Chapter 3 - Page 359 <br />