Which risk increases when the drainage system in ancient Andean terraced fields becomes obstructed?

💡 Explanation

When drainage is obstructed, water accumulates and evaporates at the surface which leads to capillary action drawing salts from the subsoil, causing increased soil salinization. Therefore soil salinization increases, rather than decreased runoff, fewer pests, or decreased temperature, conditions that require efficient drainage and different ecological controls.

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