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p. 28 <br />Table 2D <br />Range and Origin of Flow Rates <br />Considered for Wildlife Requirements <br />WILDLIFE <br />Category <br />Minimum cfs' <br />Interval <br />Source & Remarks <br />Maintenance of <br />5,000 to <br />5 days per <br />U.S. Army Corps of Engi- <br />"braided" river form. <br />8,000 mean <br />year <br />neers (1988, p 9 - -Two <br />annual peak flow <br />Forks FEIS) <br />8,000 "is required to main- <br />tain the present braided <br />reaches" <br />8,000 <br />5 days per <br />O'Brien (1986, p 2)B <br />year <br />To maintain the existing <br />remnant wide, shallow, <br />braided stretches. <br />7,800 <br />every 1.5 <br />O'Brien and Currier (1987, <br />to 2 <br />p 39) <br />years <br />Using Ferguson's (1984) <br />criteria for historic bed <br />particle size, which was <br />smaller than at present. <br />8,200 <br />every 1.5 <br />O'Brien and Currier <br />to 2 <br />(1987, p 39)° <br />years <br />Based on the Leopold and <br />Wolman (1957) relation, <br />which assumes an ade- <br />quate supply of sediment. <br />Adequate sediment is <br />necessary for maintaining <br />braided river morphology. <br />1 When discussing the physical processes influencing the Platte's braided channel morphology, <br />it is important to take into account both stream flows and sediment loads. Simply adjusting nec- <br />essary water levels without taking measures to sustain adequate sediment loads will increase ero- <br />sion and result in narrowing and deepening of the channels. While this column quantifies stream <br />flows, sediment load (amount and size) is a principal component in determining what flows <br />(volume and velocity) are required to move this sediment. This is discussed in further detail in <br />chapter III. <br />