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← HistoryWhich outcome occurred in early drainage canals when improper sealing led to increased sediment transport?
A)Canal bank structural subsidence✓
B)Increased downstream flow capacity
C)Decreased aquatic weed growth
D)Reduced aquifer recharge rates
💡 Explanation
Canal bank subsidence occurs when granular materials migrate through imperfect seals via the mechanism of soil piping. This process weakens the earthen structure because the loss of support undercuts the banks, therefore leading to structural subsidence rather than improving flow or groundwater recharge.
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