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A graduated board or post showing water level.
Also known as: Water level gauge, Flood gauge
A river gauge board shows water level against a fixed datum rather than against the riverbed, which moves. Flood warnings are issued against gauge readings, so the datum is what makes a reading from one year comparable with another.
Shows a river's water level against a fixed datum on a graduated board or post.
Contexts: Technical drawing, Maps
Reads against a fixed datum rather than the bed, which shifts, so that readings taken decades apart remain comparable.
Contexts: Technical drawing, Maps
A tall board marked with numbered horizontal lines at regular intervals, fixed vertically in a watercourse.