kompleks, mille abil mõõdetakse jõe, järve, veehoidla või mõne muu pinnaveekogu veetaset, vookogust, vee temperatuuri ning muid füüsikalisi ja keemilisi suurusi jms, station at which data on water in rivers, lakes or reservoirs are obtained on one or more of the following elements: stage, streamflow, sediment transport and deposition, water temperature and other physical properties of water, characteristics of ice cover and chemical properties of water, location used by hydrologists or environmental scientists to monitor and test terrestrial bodies of water