Which risk increases when high discharge overtops levees?

💡 Explanation

Increased sedimentation of the channel occurs because when levees are overtopped, the flow rapidly decelerates due to decreased confinement, causing deposition termed avulsion; therefore reduced channel capacity increases flood risk rather than the other options, which don't directly relate.

• Which phenomenon causes recurring displacement along the San Andreas transform Fault?
• Which of these increases because of increased substrate consolidation?
• Which outcome during sea level rise increases saltwater intrusion into fjordic groundwater aquifers?
• Which process causes the formation of freshwater lakes in regions undergoing isostatic rebound following deglaciation?
• Which phenomenon accelerates sea stack disintegration when wave height increases?
• Which outcome do anisotropic winds and airborne abrasives create?