Which outcome primarily occurs when excessive groundwater extraction lowers the water table beneath natural levees?

💡 Explanation

When groundwater is excessively extracted, the effective stress on the soil matrix increases because pore water pressure decreases, causing consolidation and subsidence, which lowers the levees and increases flood risk. Therefore levee subsidence results, rather than stability, reduced deposition, or vegetation growth alterations which are enabled by distinctly differing hydrological and soil mechanics circumstances.

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