Construction of Open wells
CONSTRUCTION OF OPENS WELLS

Construction of Open wells

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CONSTRUCTION OF OPENS WELLS

Open wells may be constructed in following three ways:

  1. Kacha wells or wells having no lining,
  2. Wells having pervious lining and
  3. Lined wells.

1. Kacha Wells.

  • These wells are of small depths and can be constructed in boulder or hard soils.
  • They can be construct places where water table is very near to the surface of the ground.
  • They can be only temporary source of irrigation water.
  • They may collapse easily and thus sometimes prove very dangerous.

2. Wells having Pervious Lining.

  • In this, the lining of the well is done in dry bricks or stones without using any mortar.
  • The seeping water can enter the well through the open joints of dry masonry.
  • Thus inflow in this case is radial and not axial. Such wells are generally plugged at the bottom by means of concrete.
  • If bottom is not plugged, then water will be entering the well both, from bottom as axial flow and sides as radial flow.
  • When such wells are constructed in fine sandy soil, the pervious lining is generally surrounded by gravel to act as vertical filter.
  • This vertical filter prevents ingress of sand along with seeping water.

3. Lined Wells.

  • In this case wells are line by stone or brick masonry or by cement concrete.
  • For constructing such a well first of all a pit is excavate with the help of hand tools.
  • The diameter of the pit is kept slightly larger in diameter than the finish diameter of the well.
  • After the pit has been dug a kerb is lai at its bottom and masonry is raise over it.
  • The masonry is raised above ground.
  • Now earth is excavat and bailed out of well and masonry is simultaneously raised over lining wall projecting above the ground level.

Open well with pervious lining.

 

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