Water quality refers to such things as the temperature of the water, the amount of dissolved solids, and lack of toxic and biological pollutants.
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Adverse effects can occur when discharge of groundwater exceeds recharge of the system.
A spring is an area on the surface of the Earth where the water table intersects the surface and water flows out of the ground, while a well is human-made hole that is dug or drilled deep enough to intersect the water table.
Permeability is a measure of the degree to which the pore spaces are interconnected, and the size of the interconnections.
Poorly sorted sediments usually have a low porosity.