How levees fail, how we fix them
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13 سال پیش
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Levees are an extremely important
Levees are an extremely important part of California's flood risk reduction system, and most are in desperate need of maintenance and repair. Learn about the primary ways levees fail and how we fix them.
13 سال پیش
در تاریخ 1390/09/28 منتشر شده
است.
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