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Wells are holes dug, punched, or drilled into the ground to access water or some other liquid such as oil or brine, or gas such as methane. The technology for digging wells has developed from shallow wells dug with hand tools to wells that are drilled thousands of feet into the surface of the earth. Water wells are dug because there is no surface or groundwater available, or because the supply of groundwater is insufficient for the needs of people, livestock, or industry. Shallow wells dug by hand were the primary source of water for people for thousands of years. Wells are considered shallow if they descend to less than 50 feet. Shallow wells reach either the water table (water table wells), which is the ...

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