Water level, also known as gauge height or stage, is the elevation of the free surface of a
sea
The sea, connected as the world ocean or simply the ocean, is the body of salty water that covers approximately 71% of the Earth's surface. The word sea is also used to denote second-order sections of the sea, such as the Mediterranean Sea, ...
,
stream
A stream is a continuous body of water, body of surface water Current (stream), flowing within the stream bed, bed and bank (geography), banks of a channel (geography), channel. Depending on its location or certain characteristics, a stream ...
,
lake or
reservoir relative to a specified
vertical datum.
[ISO 772: 1996. Hydrometric determinations – Vocabulary and symbols.]
See also
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Water level (device), device utilizing the surface of liquid water to establish a local horizontal plane of reference
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Flood stage
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Hydraulic head
Hydraulic head or piezometric head is a specific measurement of liquid pressure above a vertical datum., 410 pages. See pp. 43–44., 650 pages. See p. 22.
It is usually measured as a liquid surface elevation, expressed in units of length, ...
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Stream gauge
A stream gauge, streamgage or stream gauging station is a location used by hydrologists or environmental scientists to monitor and test terrestrial bodies of water. Hydrometric measurements of water level surface elevation ("stage") and/or volu ...
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Water level gauges
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Tide gauge
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Level sensor
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Liquid level
A liquid is a nearly incompressible fluid that conforms to the shape of its container but retains a (nearly) constant volume independent of pressure. As such, it is one of the four fundamental states of matter (the others being solid, gas, an ...
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Stage (hydrology)
In hydrology, stage refers to the water level in a river or stream with respect to a chosen reference height. Stage is important because direct measurements of river discharge are very difficult while water surface elevation measurements are comp ...
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Sea level
References
Hydrology
Vertical position
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