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 outcome occurs when rapid sedimentation chokes an alluvial fan?
• Which outcome results during pedogenesis on a floodplain?
• Downstream water diversion from meandering rivers causes which effect?
• Along a dynamic coastline, which outcome results when wave energy focuses on weaker rock formations?
• Which outcome commonly occurs along basin edges where sediment-laden rivers abruptly lose confinement?
• Which deformation mechanism causes increased earthquake frequency along transform plate boundaries given increased friction?