| The vadose zone, also termed 'the unsaturated zone', is the layer of earth between the land surface and the phreatic zone or zone of saturation. |
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| At some point in time the surface becomes saturated, and an inverted zone of saturation begins to propagate downward into the soil. |
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| Groundwater is taken to be water in that zone of saturation that has as its surface the water table. |
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| Groundwater is that part of subsurface water that is below the water table that is, water in the zone of saturation. |
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| Groundwater occurs in pore spaces of the unconsolidated alluvial sediment in the zone of saturation. |
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| The deterioration the quality of these surface water resources are influenced by the characteristics of the media through which the water passes on its way to the surface water zone of saturation. |
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| The top of this zone of saturation is the water-table. |
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| At lower depths and in presence of adequate amounts of water, all voids are filled to produce a zone of saturation, the upper level of which is the water table. |
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