Which consequence to existing building foundations occurs because seasonal alluvial river flooding exceeds designed bank capacity?

💡 Explanation

Increased hydraulic pressure in saturated alluvial deposits causes soil liquefaction because pore spaces increase; therefore buildings may tilt or sink during aftershocks after a heavy rain-induced flood, rather than other decay alone or pipeline exposure.

• Which risk commonly increases when flood control levees compress underlying organic-rich soils?
• Which outcome on leeward dune slopes results from turbulent air?
• Which long-term outcome primarily results from isostatic rebound post-deglaciation on coastal islands?
• Which outcome accelerates coastal erosion when thermokarst develops along Arctic shorelines?
• Which risk increases when coastal hydro-engineering prevents upwelling?
• Which outcome increases thermal stratification during upwelling events?