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 occurs when tectonic uplift limits fluvial downcutting alluvial valleys?
• Which process primarily maintains upwelling along the western coasts of continents?
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• Which volcanic outcome results when a confined eruption transitions directly from a lava dome collapse to intense pyroclastic flow?
• Which outcome results when mountain ranges deflect upper-level wind streams?