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The mass of water that moves with the dam body can be transferred in to extra mass of concrete attached to the dam body. For a dam concrete with the unit mass of 14Alb.percu.ft the width of concrete would be:

As it was already mentioned the Westergaard approach gives a pressure distribution which is in phase with ground acceleration. Also we imposed the boundary condition at far-end of the reservoir that as x ^ro then p ^ 0. This boundary condition is an indication of energy dissipation at the far-end. The Westergaard solution is valid if the value of cnis real. Another word, we can write:

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