Mud in borewell water due to sidewall collapse - Jamshedpur
Submitted by pinku on August 9, 2010 - 15:35
- Location: Jamshedpur, Jharkhand
- Depth - 150 ft; Water found at 50 ft
- Casing - Till 70 ft
- Submersible Pump
Due to heavy rains recently, the sidewalls had collapsed leading to mud in the borewell and over the pump too.
We think the casing was not done till it reached hard rock or there was soft soil after some hard rock .
Is flushing the borewell an option?
Comments
1. Mud in borewell water
If your sumbersible pump is giving problems then yes it is a good option to get it out and flush the borewell, if there is a problem of muddy water only this will continue for some time and then get over,
Ideally you should pour in a solution of soap water, start the pump and divert the delivery pipe back into the borewell ( say for 5 to 10 minutes), after that, allow the pump to continue discharging until the water becomes clear once again. ( say after an hour or so)
If that does not happen then probably you will have to consider , flushing and installing some more casing at depth to seal of the zone where you had encountered soft soil.
Hope this answers your doubts..
Anil Lalwani
www.wellwaterworks.com
2. Mud in Borewell due to collapse.
Dear Pinku,
Flushing only cannot solve the problem completely.
If the pump is held up inside the borehole it can be pulled out while flushing the bore using air from a drilling rig. After pulling out the pump the casing pipe can also be taken out and OB drilling should be carried out to a stable zone, ie, a bed rock, the pipe should be seated properly before further flushing and further drilling can also be done if required.
Neeradhan
(Geologist)
Trivandrum
3. Dear Member, Yes, Flushing
Dear Member,
Yes, flushing will be a temporary option.The casing should have been taken up to the depth that which encounters hard rock formation below ground level.
Slotted casing should have been provided at the productive water bearing zones and blank casing aganist the other zones.
Any how, this borewell may not last long and the submersible pump will also get clogged with sediments in due course of time and usage.
It is highly suggested to go for another new bore careully by taking the above mentioned salient features.
Murali.K.
Sr.Hydrogeologist,
Palakkad
4. Dear Member, It is possible
Dear Member,
It is possible that the casing pipe is not upto the sufficient depth. Flusing the borewell with compressor can overcome the problem temporarly.
With regards,
D. Chakraborty
Scientist
Central Ground Water Authority (CGWA)
New Delhi
5. Dear Member, Flushing may
Dear Member,
Flushing may help in pulling the pipes and the pump set out.
Simultaneous casing hammer may be required if soft formation occurs below hard formation.
If it is a case of insufficient casing length, they better drill a new well after sealing the first well with cement slurry, which is after flushing the first well for removing the pipes and the pumpset. If the first well is not sealed, second well can not be drilled near the first well because of possible air loss.
There is a dearth of competent drillers interested in the subject. The present day drillers are not qualified drillers and are interested only in footage. They are not bothered about quality criteria in doing their job. No body bothers about enforcing existing rules and regulations.
With regards,
C. Udaya Shankar
Geologist
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