Which impact resulted from increased sediment deposition behind terrace walls in pre-Columbian Andean agriculture?

💡 Explanation

When increased sediment deposition occurs, water drainage through terrace layers slows, reducing aeration because pore spaces are filled, leading to waterlogging and anaerobic soil conditions. Therefore, impaired drainage occurs, rather than increased stability, reduced salinity, or accelerated runoff, which would require different soil and hydrodynamic processes.

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• On ancient Roman roads, which risk increases as road base aggregate suffers compaction from ongoing heavy traffic?