the science dealing with the occurrence, circulation, distribution, and properties of the waters of the earth and its atmosphere.
Origin of hydrology
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Historical Examples of hydrology
the study of the distribution, conservation, use, etc, of the water of the earth and its atmosphere, particularly at the land surface
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Online Etymology Dictionary, © 2010 Douglas Harper
The scientific study of the properties, distribution, and effects of water as a liquid, solid, or gas on the Earth's surface, in the soil and underlying rocks, and in the atmosphere.
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