The likelihood of liquefaction is low and is confined mostly to levees that have been constructed on recent alluvial foundations. Many Delta levees were constructed on peat soil, which is not subject to liquefaction. Levees may move in response to seismic activity but do not collapse. In addition, Delta levees are being engineered with wider bases to further lessen the chance of damage. Urban areas in the Delta region rely on these kinds of robust levees for protection against flooding.
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