USGS Science Topics > Specific things by name
Computer software implementing a mathematical model of ground-water flow, produced by USGS.
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Creating mathematical expressions to represent a simplified view of real-world systems.
Routines, programs, and procedures devised in order to direct computers to perform specific tasks.
Branch of earth science that deals with water as it occurs in the atmosphere, on the surface of the ground, and underground.
Movement of subsurface water in the saturated zone from areas of recharge to areas of discharge.
Bodies of rock that contain sufficient saturated permeable material to conduct ground water and to yield significant quantities of water to wells and springs. [Glossary of Geology, 4th ed.]