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← GeographyWhich flooding outcome results from decreased alluvial plain permeability?
A)Increased shallow subsurface lateral flow
B)Decreased river channel sinuosity
C)Higher surface runoff coefficients✓
D)Accelerated sediment deposition at levees
💡 Explanation
Decreased alluvial plain permeability raises the water table locally, thus increasing surface runoff coefficients because infiltration is inhibited by saturated ground. Therefore surface runoff increases, rather than subsurface flow, under these saturated conditions.
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