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<br />lfe <br />~ <br /> <br />~ <br />1i: <br /> <br />I <br />I <br />I <br />l <br />I <br />[~ <br />~ <br />I <br />I <br />I <br />I <br /> <br /> <br />- <br /> <br />9.0 DISCUSSION <br /> <br />The waste rock and welded wire fabric slope protection described in this <br />report has been designed to withstand the velocities encountered during a <br />peak flow of 5810 cfs. As estimated based on the hydrograph from the U.S. <br />Army Corps of Engineers study, high velocities near the peak flow rate are <br /> <br />estimated to last for a period of one hour or less, after which flow rates <br /> <br />can be expected to rapidly decrease. <br /> <br />High flow rates of long duration or carrying excessive large diameter debris <br /> <br />may undermine the slope protection, cause channel aggradation or damage the <br />welded wire fabric protection. It is believed there is sufficient factor of <br /> <br />safety in the freeboard, scour protection depth and width of the protective <br /> <br />embankment to protect the facil ities, however extensive maintenance may be <br /> <br />required after the passage of high flows. <br /> <br />9-1 <br />