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<br />where: <br /> <br />VOL <br />r <br /> <br />= volume in reservoir (cubic ft) <br /> <br />- <br />K & m = average channel geometry fitting coefficients <br />Hd = height of dam (ft) <br /> <br />If the height (Hd) of <br />is given by the following: <br /> <br />the dam is greater than h , the equation for X <br />v c <br /> <br />X (ft) = <br />c <br /> <br />6 VOL <br />r <br /> <br />Kh m <br />v <br /> <br />(3H _ 5 :hv) <br />d m+l <br /> <br />(19a) <br /> <br />Within the distance (X ) in the downstream reach, the floodwave attenu- <br />c <br />ates such that the depth at point X is h (see figure 2), which is a function <br />c x <br />of the maximum depth (h ). The average depth (h) in this reach is: <br />max <br /> <br />h = <br /> <br />h + h <br />max x <br /> <br />2 <br /> <br />= S h <br />max <br /> <br />(20) <br /> <br />where S is an empirical weighting factor that must be determined itera- <br /> <br /> <br />tively. The starting estimate forS is 0.95. <br /> <br /> <br />. <br /> <br />The average hydraulic depth (Dc) in the reach is given by Eq. (21) or <br />(22) as follows: <br /> <br />1-15 <br /> <br />" <br />