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Watter covers 70% o the Yird's surface.

Hydrology is the study o the movement, distribution, an quality o watter on Yird an ither planets, includin the hydrologic cycle, watter resoorces an environmental wattershed sustainability. A practitioner o hydrology is a hydrologist, wirkin within the fields o yird or environmental science, pheesical geografie, geology or ceevil an environmental ingineerin.

Hydrology is subdividit intae surface hydrology an marine hydrology. Domains o hydrology include hydrometeorology, surface hydrology, hydrogeology, drainage basin management an watter quality, whaur watter plays the central role. Oceanografie an meteorology are nae includit acause watter is anly ane o mony important aspects within those fields.

Hydrological research can inform environmental ingineerin, policy an plannin.

The term hydrology is frae Greek: ὕδωρ, hydōr, "watter"; an λόγος, logos, "study".