water level

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noun
  1. 1

    The level of a body of water, especially when measured above a datum line

  2. 2

    The level of the water table below ground

  3. 3

    The waterline of a ship

  4. 4

    An instrument to show the level by means of the surface of water in a trough, or in upright tubes connected by a pipe.

Source: https://en.wiktionary.org/wiki/water%20level