• Question: Does the water decrease over the year or increase

    Asked by Louis to Philip, Maxime, Jake, Ann, Annette, Amy Heather on 12 Nov 2019.
    • Photo: Philip Schuler

      Philip Schuler answered on 12 Nov 2019:

      It always depends on which “system” or which area you talk about: if you consider the Earth, then all water stays the same (no water leaves the atmosphere and disappears in space…).
      If you consider a “groundwater body” or a catchment of a river, then you may have an increase of decrease of water, depending on things like rainfall, rainfall infiltration into the underground, evaporation on the surface, the amount of water humans abstract from a river or from the ground, etc.
      So it really depends on the “scale” you are looking at.

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