This method is most efficient in loose sand, silt, and fine gravel. Wells may be drilled to several hundred feet. This method is usually restricted to water-poor areas where sufficient quantities of water cannot be obtained from other types of wells. Wells are usually less than 25 feet deep and are typically cased with 24 inch diameter concrete rings. The annular space between the concrete rings and the bore hole is grouted with cement or concrete.
Water enters the well through the open bottom of the well.
These large diameter borings function not only as wells, but also as storage reser-voirs. Because they are usually finished several feet into the water table, the quantity of water available may vary depending upon the position of the water table which fluctuates throughout the year. The responsibility for constructing water wells rests principally with water well contractors licensed to practice in the State of Delaware. Permits are available to licensed Water Well Contractors and to those who desire to construct their own domestic or agricultural well on their own land or land leased to them for their own use. The construction of water wells is normally a job for professionals.