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| An area where permeable soil or rock allows water to seep into the ground to replenish an aquifer. |
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| Containment, treatment or removal of contaminated groundwater. May also include containment, treatment or removal of contaminated soil above the water table. |
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| Period of time that groundwater remains in an aquifer. |
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| The annual amount of water that can be taken from a source of supply over a period of years without depleting that source beypnd its ability to be replenished naturally in "wet years". |
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| Process by which an aquifer is overdrafted creating a flow imbalance within an area that results in salt water encroaching into fresh water supply. |
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| The portion below the earth's surface that is saturated with water is called the zone of saturation. The upper surface of this zone, open to atmospheric pressure, is known as the water table. |
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| Total water-bearing thickness of an aquifer. |
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| A layer within the earth's crust that generally consists of the same kinds of soils or rock material. |
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| A depression of the land surface as a result of groundwater being pumped. Cracks and fissures can appear in the land. Subsidence is virtually an irreversible process. |
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| Water above the surface of the land, including lakes, rivers, streams, ponds, floodwater, and runoff. |
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| The top of an unconfined aquifer; indicates the level below which soil and rock are saturated with water. The upper surface of the saturation zone. |
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| A bored, drilled or driven shaft, or a dug hole whose depth is greater than the largest surface dimension and whose purpose is to reach underground water supplies to inject, extract, or monitor water. |
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| The process of sealing a well that is no longer being used to prevent groundwater contamination and harm to people and animals. |
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| Location of a well placed to best protect water. |
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