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Water level, also known as gauge height or stage, is the elevation of the free surface of a sea, stream, lake or reservoir relative to a specified vertical datum.^[1]

• Water level (device), device utilizing the surface of liquid water to establish a local horizontal plane of reference
• Flood stage
• Hydraulic head
• Stream gauge
  • Water level gauges
• Tide gauge
• Level sensor
• Liquid level
• Reference water level
• Stage (hydrology)
• Sea level

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