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<br />Conclusions <br /> <br />The effects of reduced peak flows on channel maintenance are not a <br /> <br />concern. <br /> <br />The available information indicates that substrate for successful <br />Colorado squawfish spawning should be swept clean of fine sediments <br />to one-half mean cobble depth prior to spawning and maintained <br />clean throughout the spawning period. <br /> <br />L <br /> <br />\The uncertainty in determining the flushing flow results from <br />I - <br />I extrapolating the Water Surface Profile program above 12,000 cfs. <br /> <br />An analysis of the Beta movement parameter required to clean <br />cobbles to one-half depth at cross section 1 and 3 shows a minimum <br />iflushing flow of 10,000 cfs and that the flushing flow may be as <br />~igh as 20,000 cfs. <br /> <br />~ <br /> <br />The ~ration of the flushing flow should be for a number of hour~. <br />At discharges close to the required flow the duration should be for <br />a longer time, approximately qrre day. For higher discharges above <br />.the required flow the duration is shorter, approximately 3 to 6 <br />,hour s . <br /> <br />\ The r_ecurrence interval or average time between flushing events is <br />\ approximately 1.65 years based on the period 1950 to 198~. The Two <br />, ------:::-- <br /> <br />i Forks and Williams Fork projects increase the recurrence intervals <br />l~f the 10,000 cfs flows but the increases are not appreciable. <br />I <br /> <br />10 <br />