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<br />than 1 % of the time. <br /> <br />We recommend that flows lower than 4.2 m3/s (150 fe/s) not occur greater than the <br /> <br /> <br />historical frequency (i.e., 1 % of the time). This value is supported primarily by riffle wetted- <br /> <br /> <br />perimeter curve break analysis and by similar curve breaks for other hydraulic parameters. Other <br /> <br /> <br />important variables, like Colorado pikeminnow habitat and riffle area, show linear relationships <br /> <br />with discharge and, therefore, are not helpful for determining minimum flow. At 4.2 m3/s base <br /> <br />flow, approximately 50% of the Colorado pikeminnow habitat and riffle surface area is preserved <br /> <br />compared with that available at 17~0 m3/s (600 fe/s), the highest potential base flow considered. <br /> <br />lntegratedflow recommendation. We recommend that when spring runoffflows exceed <br /> <br /> <br />40 m3/s (1,413 fe/s), all flows should remain in the channel for the purpose of channel <br /> <br /> <br />maintenance. In addition, a base flow of 4.2 m3/s (150 fe/s) should be maintained and that flows <br /> <br /> <br />lower than 4.2 m3/s (150 fe/s) not occur more often than 1 % of the time, based on daily average <br /> <br />flows at Watson, Utah. . <br /> <br />8 <br />