teadus, mis uurib Maa hüdrosfääri, selles kulgevaid protsesse ning hüdrosfääri ja seda ümbritseva keskkonna vastastikust mõju
science that deals with the waters above and below the land surfaces of the Earth, their occurrence, circulation and distribution, both in time and space, their biological, chemical and physical properties, and their interaction with their environment, including their relation to living beings
scientific study of the movement, distribution, and management of water on Earth and other planets, including the water cycle, water resources, and drainage basin sustainability
Hüdroloogia jaguneb pinnavee hüdroloogiaks, põhjavee hüdroloogiaks (hüdrogeoloogia) ja merehüdroloogiaks, mis omakorda hõlmavad hüdrometeoroloogiat, pinnahüdroloogiat, hüdrogeoloogiat, drenaažibasseini majandamist ja vee kvaliteeti.
Hydrology subdivides into surface water hydrology, groundwater hydrology (hydrogeology), and marine hydrology. Domains of hydrology include hydrometeorology, surface hydrology, hydrogeology, drainage-basin management, and water quality.
