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<br /> <br />------------------- <br /> <br />FLOW <br /> <br />RIPRAP GRADE CONTROL STRUCTURE <br /> <br />STREAM BED <br /> <br />~ <br /> <br />'\ <br />t _.,-- <br />\. .// <br /> <br />KNICKPOINT <br /> <br /> <br />/LAUNCHED STONE /ORIGINAl BED <br />l BED DEGRADATION <br />. ,./1 LOCAL SCOUR <br /> <br />c;) <br /><l <br />l} <br />!? <br />.". <br />~, <br />- <br />N' <br />" <br />- <br />c' <br />;:, <br /> <br />Figures l2.4a As Built Riprap Grade Control Structure with Sufficient Launch Stone to Handle Anticipated Scour <br /> <br />FLOW <br /> <br />Figures l2.4b Launching of Riprap at Grade Control Structure in Response to Bed Degradation and Local Scour <br /> <br />Taken from "WES Stream Investigation and Streambank <br />Stabilization Handbook," Biedenharn, et.al., October 1997. <br /> <br />FIGURE 5.2 <br />