Which risk increases when constructing large impermeable structures upon an alluvial plain?

💡 Explanation

Increased channel avulsion becomes more likely because impermeable structures block natural porous alluvial deposition processes that mitigate change by distributing floodwater and sediments; therefore, avulsion potential increases rather than decreasing sediment or increasing recharge.

• Which risk prominently increases following intense pyroclastic flow events?
• Which mineral accumulation occurs due to prolonged groundwater evaporation?
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• Which outcome occurs in forearc regions when a subducting plate exhibits a shallow angle of descent?
• Which process primarily causes the formation of thermocline layers observed in deep freshwater lakes during summer stratification?
• Which mechanism causes the Coriolis effect to deflect ocean currents strongest near the poles?