Which risk increases when urban development reduces floodplain storage behind a natural levee system?

💡 Explanation

When floodplain storage decreases, the hydrograph peak attenuation diminishes because the natural capacity dampening floodwater declines leading to higher quantities arriving downstream simultaneously leading to increased peak discharge. Therefore increased downstream flooding risk occurs, rather than decreased erosion, reduced deposition, or lower recharge, which depend on sediment dynamics and infiltration.

• Which outcome arises when a major landmass disrupts a subtropical gyre's western boundary current?
• Which adverse outcome follows the loss of vegetation cover stability on thick loess deposits?
• Which risk increases when increased sedimentation causes oxbow lake formation in a river system?
• Which process causes increased deposition of alluvial sediment at a river delta when average sea level rises steadily?
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• Which consequence results when glacial till meets coastal wave action?