Which limitation created by arid river valleys spurred extensive qanat construction within ancient Persia?

💡 Explanation

Increased evaporative water losses created the problem because sunlight and dry air readily evaporate surface water; therefore, underground qanats minimized this inefficient loss through a gravity drainage method, rather than surface irrigation alone, for water management.

• Which risk increased for Roman aqueducts utilizing inverted siphons across deep valleys?
• Which risk increased within ancient Mesopotamian irrigation systems due to repeated cycles of arid weather and increased diversion?
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• Which effect increased the firing range of early gunpowder cannons employing windage gap between the ball and barrel?