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<br />000342 <br /> <br />Draft - Do Not Cite <br /> <br />18 <br /> <br />August 2003 <br /> <br />. 12,540 cfs to remove fines and sands from riffies, and <br />. 17,090 cfs to remove gravel from pools. <br /> <br />Milhous suggested that the maintenance flows are needed annually and that flushing )f" <br />flows are needed periodically, but usually not less than once in every three years. However'L-the <br />required occurrence frequency of these flows are not well understood (Milhous 1998). <br />- <br />