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| Porous, waterbearing layers of sand, gravel, and rock below the earth's surface; reservoirs for ground water |
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| the result of a pressorized aquifer intersecting the surface or being penetrated by a pipe or conduit, from which water gushes without being pumped, also called a spring. |
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| The aggregation of water molecules from vapor to liquid or solid when the saturation concentration is exceeded |
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| Tiney particles that float in the air and facilitate the condinsation process |
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| The fraction of withdrawn water that is lost in transmission or that is evaporated, absorbed, chemically transformed, or otherwise made unavailable for other puroses as a result of human use. |
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| Deterioration in water quality due to contamination or pollution; makes water unsuitable for other desiable purposes. |
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| Removal of salt from water by distillation, freezing, or ultrafiltration |
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| The temperature at which condensation occurs for a given concentration of water vapor in the air |
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| The amount of water that passes a fixed point in a given amount of time, usually expressed as liters or cubic feet of water per second |
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| The process in which a liquid is changed to a vapor |
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| Water held in gravel deposits or porous rock below the earth's surface; does not include water or crystallization held by chemical bonds in rocks or moisture in upper soil layers |
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| The process of water percolation into the soil and pores and hollow of permeable rocks |
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| Dry area on the down wind side of a mountain |
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| Area where water infiltrates into an aquifer |
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| At any given temperature, a comparison of the actual water content of the air with the amount of water that could be held at saturation |
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| Annual freshwater surface run off plus annual infiltration into underground freshwater aquifers that are accessible for human use. |
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| The length of time a component, such as an individual water molecule, spends in a particular compartment or location before it moves on through a particular process or cycle |
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| Movement of saltwater into freshwater aquifers in costal areas where groundwater is withdrawn faster then it is replenished |
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| The maximum concentration of water vapor the air can hold at a given temperature |
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| A large surface crater caused by the collapse of an underground channel or cavern; often triggered by groundwater withdrawl. |
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| The process by which water can move between solid and gaseous states without ever becoming liquid |
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| A settling of the ground surface caused by the collapse of porous formations that result from withdrawl of large amounts of groundwater, oil, or other underground materials |
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| The evaporation of water from plant surfaces, especially through stomates |
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| A situation when residents of a country don't have enough accessible, high quality water to meet their everyday needs. |
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| The top layer of the zone of saturatino; undulates according to the surface topography and surface structure |
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| The land surface and groundwater aquifers drained by a particular river system |
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| A description of the total amount of water taken from a lake, river, or aquifer |
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| Upper soil layers that hold both air and water |
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| Lower soil layers where all layers are fillled with water |
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