The relevance of the present textbook is that it conforms to modern requirements of the training program of the last generation of discipline "Hydrogeology" and is intended to students of secondary professional education in the Hydrogeology direction, specialties of Science about Earth.
The underground waters making one of earth covers - the hydrosphere of a subsoil, play an important role in transfer of various substances, in particular components of mineral deposits, in activity of people. The person uses underground waters as a water supply source (fresh waters), in the medical purposes (mineral and balneological waters), in production activity for power production and heating (hydrothermal waters), for extraction of rare and valuable components (industrial waters), in technological processes, for melioration, etc.
The textbook accompanies development of knowledge of disciplines "The general hydrogeology", "Lithology", "Structural geology", "Minerals", "Hydrogeology and engineering geology" and to other Sciences about Earth.