10 Ground Water - (J Ground Water Ground water is the...

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(J) Ground Water Ground water is the largest reservoir of unfrozen fresh water on earth Zones of subsurface water: - Zone of saturation Zone of saturated rock or soil immediately above the impermeable material; all voids filled with water Zone of aeration Zone of rock or soil in which the pore spaces are filled partly with water and partly with air Water table is defined as the top of the zone of saturation, where the saturated zone is not confined by overlying impermeable rocks Precipitation is the source of ground water, and the rate of infiltration/seepage depends on: - Rate & amount of rainfall Slope of the ground Vegetation cover Climatic factors, e.g. temperature, humidity, wind Soil texture Human interference, e.g. the construction of dams and reservoirs, urbanization Physical properties of geological materials may also govern the infiltration rates: - Porosity Permeability Proportion of void space in the material
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