An aquifer is a layer of water flowing through the pores or cracks in an underground geological formation consists of gravel, porous sand or stone, capable of storing and rendering the water.
geological and hydrological conditions determine the type and function. The higher is the porosity of rocks produces more water the aquifer. There are two types of aquifers: the confined and unconfined.
In the confined aquifer, water is trapped between impermeable layers of rock or between cracks in the rock formation. In an unconfined aquifer, however, water is stored under pressure for not being encapsulated in the rock.
underground Because it is not always known the existence of an aquifer. The largest known are:
Nubian Sandstone Aquifer (Africa), with 75 billion cubic meters
Northern Sahara Aquifer, with 60 billion cubic meters
Guarani Aquifer, with 37 billion cubic meters
Great Artesian Account of Australia, with 20 billion, and High Plains Aquifer
United States with 15 billion
among others. Source
Clarin April 12, 2010
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