Which risk increases when rapid subsidence occurs in a protected floodplain behind engineered levees?

💡 Explanation

When rapid subsidence occurs, the floodplain elevation decreases relative to the river constrained by the levees, increasing the possibility the flood waters will exceed the levee crest causing the flood. Therefore localized levee overtopping results, rather than reduced sedimentation, enhanced biodiversity, or enhanced recharge rates which require different conditions.

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