The scientific disciplines of hydrology and hydrogeology are expanding as the Earth's water is being recognized by governments and individuals as a shrinking resource no entity can afford to take water for granted. At the present time, there is no single reference source for definitions.The Encyclopedic Dictionary of Hydrogeology is a practical, comprehensive reference guide with complete definitions of terms in hydrogeology and other fields closely related to water practices. This concise reference not only defines terms and concepts, but also provides a clear explanation of key elements so that an in-depth understanding of processes may be obtained. With more than 2,000 entries, from "absolute permeability" to the "Z-R relationship", this dictionary features the most up-to-date vocabulary in hydrology and hydrogeology. This dictionary would be of use to practicing scientists and professionals in all the fields of water science More than 340 graphs, tables and diagrams complement the entries in order to clarify terms, methods, or processes Essential reference for students, academics, consultants, and practitioners in hydrology, hydrogeology, environmental engineering, environmental law, and the government