Which risk increased during the expansion of ancient Mesopotamian irrigation canals beyond natural river floodplains?

💡 Explanation

When irrigations canals extended beyond natural floodplains lacking regular replenishment, capillary action drew subsurface salts to the surface because of high surface evaporation, leading to increased salinization. Therefore, salinization increased rather than sediment increases, water estuary reduction or alteration flood frequency all requiring different hydraulic relationships.

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