River and Canal Engineering, the characteristics of open flowing streams, and the principles and methods to be followed in dealing with them. — 6. Falling Shutters.—In Thénard’s system, first used in France, a shutter (fig. 43) is hinged at its lower edge and is h

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River and Canal Engineering, the characteristics of open flowing streams, and the principles and methods to be followed in dealing with them. 6. Falling Shutters.—In Thénard’s system, first used in France, a shutter (fig. 43) is hinged at its lower edge and is h · ch 51/78

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