Which risk escalates downstream after a lahar overwhelms levees?

💡 Explanation

Channel avulsion increases because levee failure spreads slurry laterally, intensifying **sediment loading**. Therefore, future course changes become more probable rather than uniform soil enrichment or reduced groundwater absorption depending on composition.

• Which risk increases for structures founded upon unstable alluvial soils?
• Which mechanism contributes to tsunami formation along subduction zone fault lines during earthquakes?
• Which landform results from variations in stream deposition rates?
• Which consequence results when a landmass disrupts prevailing wind patterns?
• Which effect most directly establishes the polar jet stream along the boundary between the Ferrel and Polar cells?
• Which mechanism causes surface ocean gyres' intensification along western continental coasts?