Which mechanism causes increased flood risk when building impermeable surfaces on an alluvial fan?

💡 Explanation

When impermeable surfaces are built, reduced infiltration occurs because the water cannot penetrate the ground, leading to increased surface runoff volume and velocity. Therefore flood risk increases, rather than soil moisture decrease, recharge, or channel stabilization, each requiring altered hydrological processes.

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• Which atmospheric effect results when a strong pressure gradient forces air towards the poles within a Hadley cell?
• Which outcome occurs when long-term permafrost thaw destabilizes a subsea methane hydrate deposit?
• Which mechanism explains sediment layering in glacially-formed proglacial lakes with seasonal meltwater inflow?
• Which geographical effect influences the angle of deflection due to the Coriolis effect on ocean currents strongest?