Definition of "wasteweir" []

• A weir that allows the escape of excess water from a canal or reservoir (noun)

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• "A dam 2,400 feet long and 80 feet in height, with tunnels, wasteweir, and accessory works would be required at Mountain View."
• "The situation is such that an ample wasteweir may be built at a low-side dam on the solid rock of Hook Mountain remote from the dam, and outlets may be had by tunneling the same ridge."