Flooding Risk for Cofferdams: Time to Reach 1.5 Meters Without Pumps?

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gurly03star
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How long would it take for a cofferdamn to flood to a depth of 1.5 meters if the pumps were to fail?
 
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gurly03star said:
How long would it take for a cofferdamn to flood to a depth of 1.5 meters if the pumps were to fail?

That depends on the type of soil, i.e. on the filtration coefficient.