Which constraint increases when an early aqueduct's channel cross-section is minimized?

💡 Explanation

Frictional head loss affects aqueducts adversely because reducing area increases velocity, therefore flow suffers due to greater viscous dissipation within channels. This restricts throughput, rather than suspended solids or minor capillary or evaporation effects.

• Which outcome occurred when pre-Columbian Mesoamerican agricultural terraces experienced prolonged rainfall?
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• Which risk increases when irrigation canal soil experiences repeated saturation/desiccation cycles in the Indus Valley?
• Which canal failure mode became increasingly prevalent as Mesopotamian settlements expanded upstream?
• Which outcome resulted from exceeding the compressive strength limit in Roman concrete arch construction?
• Which risk increases when Inca rope suspension bridges experience high foot traffic?