Groundwater's water located beneath the ground surface in soil pore spaces and in the fractures of lithologic formations. A unit of rock or an unconsolidated deposit's called an aquifer when it can yield a usable quantity of water. The depth at which soil pore spaces or fractures and voids in rock become completely saturated with water's called the water table. Groundwater's recharged from, and eventually flows to, the surface naturally; natural discharge often occurs at springs and seeps, and c… (More on Groundwater)