Which outcome occurs when floodwaters overtop river levees?

💡 Explanation

Increased flow causes crevasses during levee overtopping due to hydraulic scour, because the concentrated water erodes the levee structure itself, therefore creating more instability rather than uniform aggradation found in typical floodplains.

• Which landscape outcome results when 'cat steps' increase runoff?
• Which consequence results when increased plate subduction rate occurs?
• Which atmospheric effect causes deflection of prevailing winds forming distinct east-west bands?
• Which outcome occurs when a coastal levee under intense wave action exceeds its design shear strength?
• Which risk increases when topsoil bioturbation exceeds threshold rates?
• Which outcome is most likely when glacial meltwater inflows into a pluvial lake?