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View Looking Upstream <br />NOTE: <br />Key stone into channel banks and <br />extend it beyond the abutments a <br />minimum of 18" (0.5m) to prevent <br />flow around dam. <br />Section A - A <br />FI tl►ni <br />UIA <br />18" (0.5m) — <br />�- 12" (150mm) <br />Spacing Between Check Dams <br />'L' = the distance such that points 'A' and <br />'B' are of equal elevation. <br />POINT'A' <br />Figure 4.2.7 — Rock Check Dam <br />24" (0.6m) <br />POINT'B' <br />NOT TO SCALE <br />Volume II — Construction Stormwater Pollution Prevention - August 2012 <br />4-76 <br />• <br />• <br />• <br />