Which mechanism unintentionally reduced flow rate in some medieval qanat systems?

💡 Explanation

Reduced flow occurred because mineral-rich water caused scaling via calcium carbonate precipitation, narrowing water channels; therefore, hydraulic diameter decreased, rather than groundwater limitations or direct evaporation effects.

• Which defensive advantage results when Roman fortresses utilize a ditch-and-rampart system?
• Which consequence arises during wooden warship construction when planking timbers exceed Young's modulus limits during hull bending?
• Which outcome occurs when a Roman aqueduct experiences differential ground settlement?
• Which risk to Song Dynasty-era cast iron cannons increased from high copper ore smelting?
• Which risk substantially heightened when Mughal garden designers elongated water channels excessively?
• Which risk increased during 14th century Chinese mining when gunpowder replaced human labor?