Hydrogeology is the branch of geology concerned with the distribution, movement, and quality of groundwater in the Earth’s crust. It encompasses the study of aquifers, groundwater flow, and the interaction between groundwater and surface water. Hydrogeology is essential for water resource management, environmental protection, and understanding the hydrological cycle.
Reference: Fetter, C. W. (2001). Applied Hydrogeology. Prentice Hall.