Which hazard increases when a river's natural levee system is artificially reinforced and raised?

💡 Explanation

When levees are raised, water is confined to a smaller channel during floods because the capacity for overbank flow is lowered, leading to increased water height and velocity. Therefore, areas outside the reinforced system experience higher flood risk, rather than sedimentation, reduced recharge, or saltwater intrusion which rely on other mechanisms.

• Which effect of the earth's rotation most directly influences global ocean current deflection around continents?
• Which resulting phenomenon occurs when highly viscous lava cools rapidly?
• Which mechanism amplifies stream meandering on coastlines undergoing isostatic rebound due to melting glaciers?
• Which outcome is directly caused by increased meander cutoff along entrenched river streams?
• Which mechanism explains stalactite formation in karst caves?
• Which process limits nutrient availability despite large oceanic gyre circulation?