Groundwater
Groundwater is the water located beneath Earth's surface in soil pore spaces and in the fractures of rock formations. A unit of rock or an unconsolidated deposit is called an aquifer when it can yield a usable quantity of water.
Groundwater is generated by rain seeping deep into the soil where it accumulates to form an aquifer. Eventually this water flows towards rivers, lakes or the ocean.
Victorian Environment Protection Act 1970
The Victorian Environment Protection Act 1970 defines groundwater as "any water contained in or occurring in a geological structure or formation or an artificial land fill."