adhesion aeration africa agriculture alluvium aquifer test argentina arsenic arsenic contamination of groundwater artesian aquifer atlas mountains atmospheric pressure basalt beach bedrock biscayne aquifer brazil capillary action capillary fringe cave chalk clay cretaceous deccan traps diameter earth edwards aquifer england erosion fossil water gravel great artesian basin great manmade river groundwater groundwater model human hydraulic conductivity hydraulic head hydrogeology ice age india irrigation isobar israel karst topography lake libya limestone list of aquifers mahomet aquifer meteoric water misconception mount lebanon north africa oak ridges moraine ogallala aquifer oman overdrafting paraguay phreatic porosity pump river salt saltwater intrusion san diego formation sand seasonal thermal store silt specific storage stream suction syria texas united states uruguay vadose zone village water water content water supply water table water well