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Domestic wells are often 4 or 6 inches to accommodate economically-priced pumps with yields from a few gallons per minute (gpm) to more than 50 gpm.
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Monitor wells are commonly 2 inches in diameter to accommodate a small bailer or pump for purging prior to sampling. Wells may be constructed to seek water, oil, or natural gas. It normally has a small diameter, typically less than 3 meters (10 feet), and usually measured in centimeters (inches). Regardless of its purpose, a well is defined as an artificial hole in the land surface created to access a liquid.