Live Quiz Arena
🎁 1 Free Round Daily
⚡ Enter ArenaQuestion
← GeographyWhich mechanism causes increased flood risk when an alluvial fan experiences rapid urbanization?
A)Reduced infiltration increases surface runoff✓
B)Channel incision decreases sediment transport
C)Increased evapotranspiration reduces soil moisture
D)Decreased stream sinuosity accelerates flow
💡 Explanation
When alluvial fans are urbanized, reduced infiltration occurs because impermeable surfaces prevent water from seeping into the ground, increasing the volume and rate of surface runoff directly into channels. Therefore, increased flood risk results, rather than incision, changed evapotranspiration, or channel straightening which affect sediment or flow dynamics differently.
🏆 Up to £1,000 monthly prize pool
Ready for the live challenge? Join the next global round now.
*Terms apply. Skill-based competition.
Related Questions
Browse Geography →- Which outcome occurs when long-term permafrost thaw destabilizes a subsea methane hydrate deposit?
- Which process limits nutrient availability despite large oceanic gyre circulation?
- Which mechanism causes meandering stream patterns in low-gradient landscapes following tectonic uplift?
- Which mechanism creates a stratified water column within a fjord following a glacial meltwater pulse?
- Which mechanism causes global surface temperature redistribution by thermohaline circulation?
- Which mechanism causes uplift and mountain building along convergent plate boundaries with strike-slip fault zones?