What does hydrology mean?
Hydrology is the branch of earth science concerned with the movement, distribution, and behavior of water on and below the Earth's surface. It examines rainfall, rivers, lakes, groundwater, soil moisture, and the water cycle, as well as the effects of human activity and environmental change on these systems. Hydrologists use measurements, models, and fieldwork to understand questions such as how much water a river carries, how quickly groundwater responds to rainfall, and how flooding or drought may develop. The word is especially common in scientific, environmental, engineering, and public-policy contexts. A closely related field, hydrography, concentrates more specifically on recording and measuring changes in water flow or level, while hydrology encompasses the broader study of water and its behavior.
nounThe branch of earth science that studies the movement, distribution, and properties of water on and below the Earth's surface, including precipitation, groundwater, rivers, lakes, and the water cycle.
- The scientific study of the movement, distribution, and properties of water on and below the Earth's surface.
"The researchers used hydrology to understand how rainfall contributes to the river's seasonal flow."
"Hydrology helps communities plan for floods, droughts, and changes in river flow."
"The course introduces students to hydrology, including the study of rainfall, groundwater, and watersheds."
Used when referring to separate bodies of hydrological research, theories, or studies.
"The journal publishes research on the hydrology of arid and mountainous regions."
Hydrology connects the rain falling on a mountain to the groundwater, rivers, and ecosystems downstream.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does hydrology come from?
Hydrology comes from Greek hydōr, meaning “water,” combined with the Greek suffix -logia, meaning “study of.” The related English words hydraulic, hydrous, and hydrogen all reflect the same water-based root. The term emerged as a scientific designation for the study of water and its movement, especially during the development of hydrology as a distinct discipline in the nineteenth century.
Related word forms
How hydrology is actually used
The term is used mainly in academic, scientific, environmental, and public-policy contexts. In general usage, it is less common than related everyday terms such as water management or watershed science.
Easily confused with hydrology
Hydrology is the scientific study of water and its movement, whereas hydrography focuses on recording and measuring changes in the flow or level of water.