Driven Permanent Casing

What is it?

A permanent casing, or hole lining, can be sunk into the ground as drilling progresses. This casing acts like a wall, stopping the collapse of the hole. The casing is sunk until the ground is stable or until the level is reached at which water will be extracted, at this level a screen is then used. A good description is given in section 4.7 on the UN FAO website

Good Things

  • Strong and reliable, no risk of hole collapse if used

Bad Things

  • Expensive as metal casing must be used and left in place at every hole
  • Can be difficult to drive the casing through sticky clays or sandstone to unstable layer below

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