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Figure 11-4.2.16 Cross Section of Sediment Trap <br />Surface area determined 4' Min. <br />at top of weir <br />1' Min. <br />— <br />T��G <br />3.5' - 5' <br />y <br />1.5' Min. <br />1 <br />Flat Bottom <br />Note: Trap may be formed by berm or by <br />partial or complete excavation. <br />DEPARTMENT OF <br />ECOLOGY <br />State of Washington <br />%a' ravel <br />Washed gravel <br />Geotextile Yy <br />2" - 4" Rock <br />Rip Rap <br />—L Overflow <br />1' Min. L <br />V 1Min. <br />Discharge to <br />stabilized <br />conveyance, <br />outlet, or level <br />spreader <br />NOT TO SCALE <br />Figure II-4.2.16 <br />Cross Section of Sediment Trap <br />Revised November 2015 <br />Please see http://www.ecy.wa.gov/copyright.htm/for copyright notice including permissions, <br />limitation of liability, and disclaimer. <br />2014 Stormwater Management Manual for Westem Washington <br />Volume 11- Chapter 4 - Page 386 <br />