Which mechanism causes increased flood frequency in populated regions near alluvial fans after prolonged drought?

💡 Explanation

After drought, decreased infiltration due to hardened/compacted soils in alluvial fans results in reduced soil stability because fine sediment binding collapses, leading increased surface runoff during subsequent rain events, thereby enhancing flooding. Therefore, decreased infilitration results, not increased evaporation/roughness or changes in river channel volume which require other factors.

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