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Some abandoned wells are subsequently plugged and the site is remediated; however, the cost of such efforts can be in the millions of dollars. [9] In this process, tubing is removed from the well, and sections of wellbore are filled with cement to isolate the flow path between gas and water zones from each other, as well as from the surface.
They may be built with a high degree of community participation, or by local entrepreneurs who specialize in hand-dug wells. They have been successfully excavated to 60 metres (200 ft). They have low operational and maintenance costs, in part because water can be extracted by hand, without a pump.
Dry wells are excavated pits that may be filled with aggregate or air and are often lined with a perforated casing. The casings consist of perforated chambers made out of plastic or concrete and may be lined with geotextile. [4] They provide high stormwater infiltration capacity while also having a relatively small footprint. [5]
They may also contain sculptures. Much of the area may be filled with gravel, set with larger stones, and carefully raked and kept free of weeds. Plants may be very minimal, and surrounded by stones, [1] or the whole area may be covered with vegetation. Shade-loving plants are needed, as a narrow courtyard will seldom be in direct sunlight.
During the Neolithic era, humans dug the first permanent water wells, from where vessels could be filled and carried by hand. Wells dug around 8500 BC have been found on Cyprus, [2] and 6500 BC in the Jezreel Valley. [3] The size of human settlements was largely dependent on the amount of water available nearby.
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