Which consequence occurs when prolonged river sedimentation exceeds levee subsidence in a delta?

💡 Explanation

When river sedimentation overwhelms levee subsidence, sediment builds up rapidly through breaches called crevasse splays. Because sediment surpasses the original levee height and overflows dramatically from new channels, formation of crevasse splays results, causing rapid changes to river morphology, not just coastal erosion, groundwater changes, or floodplain draining.

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