Which condition necessitates terraces incorporating specific drainage systems in pre-Columbian Andean agriculture?

💡 Explanation

When intense seasonal rainfall occurs on sloped terraces, waterlogging can saturate the soil because gravity concentrates water flow downslope resulting saturation which destabilizes platforms and suffocates crops. Therefore complex drainage systems are required, rather than systems for seismic activity, wind, or alkaline soil, because those conditions do not primarily cause water accumulation.

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