Which risk increases when upstream river engineering projects disrupt sediment deposition in floodplains adjacent to engineered levees?

💡 Explanation

When sediment deposition is disrupted, floodplain elevation lowers because there is less material accumulating, reducing water storage capacity during a flood, causing increased levee overtopping during peak river discharge. Therefore, increased levee failure results, rather than salinization, subsidence, or biodiversity loss which relate to different processes.

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