water level

definition: a water gauge that shows the level by showing the surface of the water in a trough or U-shaped tube
example:
speech part: noun
synonyms:
definition: the level of the surface of a body of water
example:
speech part: noun
synonyms:
definition: a line corresponding to the surface of the water when the vessel is afloat on an even keel
example:
speech part: noun
synonyms: waterline
definition: underground surface below which the ground is wholly saturated with water
example:
speech part: noun
synonyms: water table groundwater level

How water level is being used?