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← GeographyWhich outcome occurs when rapid snowmelt overwhelms levees?
A)Decreased sediment deposition downstream occurs✓
B)Aggradation occurs near impacted reaches
C)Increased channel incision follows rapidly
D)Base level lowering is initially observed
💡 Explanation
Decreased sediment deposition downstream occurs because when snowmelt surpasses capacity, the levee systems fail via overtopping; this invokes a decrease in flow energy reaching depositional areas due to upstream flooding, rather than concentrated channel flow necessary for sediment transport downstream.
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