Maximum Negative Pressure Head

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Initial Water Table中
的Maximum Negative Pressure Head 有什么作用啊？

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When you use an initial water table you must specify the maximum negative pressure head that the soil will experience for all points higher than the water table.  You should consult the Engineering Books for more discussion on this.  If in doubt about what value to enter, chose a value equal to the distance from the water table to the highest elevation in the model.
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