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Figure 11-4.2.7 Rock Check Dam <br />View Looking Upstream <br />Note: <br />Key stone into channel banks and extend it <br />beyond the abutments a minimum of 18" <br />(0.5m) to prevent flow around dam. <br />Section A -A <br />-4 <br />24" (0.6m) <br />•� o <br />8' (2.4m ) <br />Spacing Between Check Dams <br />-A 18" <br />12" (0.5m) <br />(150mm) <br />24"(0.6m) <br />A <br />'L' = the distance such that points <br />Wand 'B' are of equal elevation. <br />Point 'A' Point 'B' <br />'o <br />NOT TO SCALE <br />Figure II-4.2.7 <br />Rock Check Dam <br />DEPARTMENT OF Revised July 2015 <br />ECOLOGYPlease see http://www.ecy.wa.govlcopyright.html for copyright notice including permissions, <br />State of Washington limitation of liability, and disclaimer. <br />2014 Stormwater Management Manual for Westem Washington <br />Volume 11 - Chapter 4 - Page 354 <br />