Which risk increases when artificial levees constrict a river's floodplain during an extreme rainfall event?

💡 Explanation

When levees constrict a floodplain, channel conveyance increases because the flood storage capacity is reduced, concentrating flow and leading to a larger flood wave downstream during a major rainfall. Therefore, the downstream flood pulse magnitude increases, rather than deposition, erosion, or reduced recharge, which involve different hydrological processes.

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