TUBE WELL
TUBE WELL
- This well is a type of deep well, tapping ground water from one or several confine aquifers lying under surface
- inserted in the ground.
- The parts of the pipe which are hollow and do not have any slots at this surface are known as blind pies.
- he parts of pipe that have slots at their surface are known as strainer pipes or perforated pipes.
- Thus a tube well consists of strainer pipes as well as blind pipes.
- There are several types of strainers or perforated pipes which have been explained later in this chapter
- The discharge of tube well is several times more than open well. The reasons of greater discharge are the following:
- Tube wells can tap several water bearing stratum.
- Water can seep into the tube well with several times more velocity than the critical velocity of flow in the case of open well.
- This becomes possible because strainer pipes allow only water to pass through and no sand particles.
- There is no danger of well being subsided.
- Flow in the well being radial and that too from several water bearing layers, the cross-sectional area contributing water to well becomes quite large and thus quite large discharge can be obtained from the tube well.
- Tube wells may be constructed by the government or by the individual farmers.
- The average yield from a tube well is of the order of 40 to 50 lit/sec.
- Tube wells have been installed to give yield as high as 200 to 250 lit/sec.
- The depth of the tube wells may vary from 20 m to as high as 500 m.
- The diameter of the bore hole is kept 60 cm for top 60 mdepth.
- Tube wells can be easily installed in such soils and are very useful for irrigation.