Which risk increases when rapid levee construction uses poorly compacted fill material on a floodplain lacking vegetation?

💡 Explanation

When rapidly constructing levees with poorly compacted fill and absent vegetation, slope instability occurs because the loose material cannot withstand hydrostatic pressure during floods, leading to levee failure. Therefore the risk of levee collapse is heightened, rather than mudflows, downcutting, or decreased recharge which result from alternative geo-mechanical conditions.

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