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Which outcome occurs when terrace drainage in ancient Bannockburn earthen forts overwhelms their structural capacity during intense rainfall?

A)Compacted soil layer destruction
B)Increased risk of slope failure
C)Enhanced crop yield downturn
D)Undermined fortification wall destabilization

💡 Explanation

Slope failure risk increases because increased pore water pressure within the terraced soil reduces its shear strength due to the Bishop's method. Therefore, landslides are likely, rather than soil compaction because the mechanism primarily depends on water pressure.

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