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<br />If however, Q is found to be less than Qb then h must be less than <br />v ~x v <br />hmax' and hmax is calculated as follows: <br /> <br />hmax = p( QbmaJ/5 + y <br /> <br />h <br />v <br /> <br />(11) <br /> <br />where: <br /> <br />P <br /> <br />[ a(m + <br /> <br />1 <br />1 )513 <br /> <br />] 3/5 <br />h m <br />v <br /> <br />(12) <br /> <br />y = <br /> <br />m <br />m + 1 <br /> <br />(13) <br /> <br />and a is defined by Eq. (9). <br /> <br />Submergence Correction1 <br /> <br />The maximum breach outflow must be corrected iteratively for submer- <br /> <br /> <br />gence resulting from tailwater effects if the computed maximum outflow stage <br /> <br /> <br />(hmax) is greater than (0.67 ~eir) where hweir is the head over the weir <br /> <br /> <br />(breach) at time tf as expressed by the following relation: <br /> <br />'.." -(" .'~:r <br /> <br />(14) <br /> <br />where C is defined by Eq. (2). <br /> <br />If the ratio of (hmax/hweir) is greater than 0.67, a sumbergence <br />correction factor must be computed as follows: <br /> <br />" <br /> <br />* <br />K = 1 - 27.8 <br />s <br /> <br />[::;; - 0.6]' <br /> <br />(15) <br /> <br />1 Note: Submergence correction need not be made in the event of an <br />instantaneous failure. <br /> <br />1-7 <br /> <br />1- <br />