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where B is the width of the weir, hw the height of retained water, and d the depth of cut-off.

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The characteristic exit gradient for our design situation is:

ik = iE(B > hw> d)= 029 ® At depth d on the downstream side of the cutoff, we have the characteristic destabilizing pore water pressure: uk = ywx (l + ik) x d = 40.6 kPa and the characteristic stabilizing vertical stress: a^ = ykx d = 62.4kPa

The characteristic seepage force on the downstream side of the cutoff is

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