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1 <br /> I View Looking Upstream <br /> g 18„'(0.5m) -4-- <br /> 12"(150mm) <br /> ,//, / oov °q o '.4;, •,,"a4//\/ 24"(0.6m) <br /> 1 NOTE: A � $ 954 ©'' t <br /> ' � Y ,' <br /> Key stone into channel banks and / <7/ // �/ / <br /> extend it beyond the abutments a \'\����\ \\i\� <br /> I <br /> minimum of 18"(05m)to prevent; A <br /> flow around dam. <br /> I Section A - A <br /> FLOW <br /> 00, <br /> 0, <br /> . ........,. 0�4�b <br /> DO d , <br /> F'\�\/,\/• \ \ e \„ , , oOo„ . „O�o0• <br /> A. <br /> / ./;�/: // y//\y%� <br /> Ii 8'(2.4m) ..~ <br /> I Spacing Between Check Dams <br /> 'L'=the distance such that points'A'and <br /> 1 'B'are of equal elevation, <br /> Q� \ �r POINT'B' <br /> \</ /\/\ \ <br /> POINT''A' <br /> '\//.N//.\/\\s•\`,\//\// /:/ //\/ /\ <br /> I .. / <br /> NOT TO SCALE <br /> I <br /> Figure 4.13 Check Dams <br /> I <br /> I . <br /> I <br /> February 2005 Volume it—Construction Stonnwater Pollution Prevention 4-77 <br />