A bore well is a well of 4 1/2", to 12" in diameter drilled into the earth for retrieving water. In this 4 1/2" and 51/2" Bore wells are commonly for Domestic purposes while 6 1/2 and more are for Commercial / Industrial purposes. A bore well is cased in the region of loose subsoil strata open in hard rock or in crystalline rock. High grade PVC pipes are used for Casing in bore wells. The depth of a bore well can vary from 150 feet to 1500 feet.