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Time-delay in installing pump in borewell - any issues ?

Is there a time duration (which is safe) within which the Borewell Pump has to be installed?

We installed a borewell (6.5") about a month back with 45 ft Steel and 38 ft PVC casing. Now when we are trying to put the submersible pump it is not going beyond 80 ft. The guys says there could be silt. Total depth drilled is 185 ft and the water was stuck at 115 ft. There was no loose soil after we hit the rock at 38 ft of drilling. We stay in Banglore North.

Purushottam Muralidhar

purushottamm@rediffmail.com

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Comments

1.

There is some confusion in the description of Purushotham regarding the bore well constructed. Is the casing pipe installed with 45 feet long steel pipe, or 38 feet long plastic pipe, or 83 feet long steel-cum-plastic pipe?

If the bore well was drilled properly to a depth of 185 feet just one month ago, its depth should remain the same even now. It is evident that that the bore well was not properly constructed on account of lapse on the part of the drilling agency who carried out drilling. It is possible that the casing pipe was not installed to cover the entire length of the loose formations encountered. Alternatively, the casing pipe was not properly installed for sufficient depth into the hard rock beneath the loose formations resulting in the vertical movement of loose material surrounding the casing-pipe portion of the bore well to enter into the bore well through the annular spacings. Alternatively, there can be loose pockets within hard rock in the uncased portion of the bore well that caved into the bore well.

The drilling agency who actually carried out drilling should be in a better position not only to explain the reasons for silting of the bore well but also set right the problem. He should take up flushing of the bore well at a nominal cost and solve the problem.

R. Jagadiswara Rao

Dr. R. Jagadiswara Rao, Professor of Geology Retired, Sri Venkateswara University, Tirupati, AP 517502, India rjagadiswara@gmail.com

2.

In general, time delay in installation of a pump in bore hole should not affect the drilled depth - provided the drilled hole is kept open and not protected properly such as sealing the top with an appropriate end cover. 2 to 3 ft silt deposit is acceptable. Please check with the drilling company who did the job, if possible use them to flush the well.

Arumugam Kalimuthu,
Chairperson, WES-Net India
&
Technical Advisor - Water Supply & Environmental Sanitation,
Plan India

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