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← GeographyWhich consequence commonly results when heavy rainfall overwhelms alluvial plain drainage?
A)Oxbow lake formation increases rapidly
B)Groundwater salinity rises exponentially
C)Flash flood risk is dramatically increased✓
D)Erosion rates significantly slow downstream
💡 Explanation
Increased flash flood risk occurs because saturated alluvial plains experience decreased infiltration capacity, therefore surface runoff increases sharply during intense rainfall events, rather than contributing to gradual river flow increases or different salinity.
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