Deep tube well means a tube well called as such operated by a submersible pump set or turbine pump coupled with a prime mover capable of pumping ground water when the pumped water level depth is more than 7 meters. A tube well is a type of water well in which a long, 100–200 millimeters (3.9–7.9 in)-wide, stainless steel tube or pipe is bored underground. The lower end is fitted with a strainer, and a pump lifts water for irrigation. The required depth of the well depends on the depth of the water table.
How long do tube wells last?
Tube wells are manually operated and can lift water from about 30 meters beneath the ground. They are designed to last at least 10 years and can be easily maintained by the beneficiary. The wells are located in convenient locations, often between a cluster of houses.
Tube well
Different types of tube wells are used in Bangladesh for groundwater abstraction. The most popular one is known as Hand Tube well (HTW) and there are at least five million of these all over the country. They use number 6 pumps for abstracting water for drinking and domestic use. A second type of hand tube well is known as Tara pump operated by a piston pump and are also used for drawing water from deep GROUNDWATER TABLE areas. These wells have normally 3.81 to 6.35 cm diameters. Shallow Tube wells (STW), mostly used for irrigation, have 5.08-10.16 cm diameter and abstract water with the help of centrifugal pump.
Deep Tube wells (DTW) are of large diameter (15.24-20.32 cm) and pump water by a submersible turbine pump. Irrigation DTWs are called deep wells not because of large depth but because of the type of pump used and the capacity of the well. The material used for HTW, TARA and STW are mostly PVC although GI pipes are used in some cases.