Borewell Construction - Advice Required - Warangal, Andhra Pradesh
Submitted by shyam on December 4, 2009 - 15:27
We have drilled a borewell in Warangal District, Andhra Pradesh (November 2nd,2009) and are planning to install a motor. Installation of the motor is planned for after 2 to 3 months.
Details of borewell:
Depth of borewell 185 Feet, with 6 inch dia. Casing done up to 60 feet. Water was struck from 80 feet with approximately 2 inches of water.
I heared that if we are not installing the motor immediately then the borewell will get dry. Is this true ? If so, could you please clarify as to the reasons for the same?
Regards,
Shyam
Comments
1. Dear Mr.Shyam, Your query
Dear Mr.Shyam,
Your query is a good one. I hope that the bore well is flushed properly after drilling to activate the fracture zones. Well, if we do not pump out and activate the water yielding fracture, the fracture may get filled by secondary minerals. Also, If the near by members uses a high H.P pump in thier borewells which is being fed by the same aquifer, then there is all chances of your bore well giving less yield or even gets dried up.
Thanks
Murali Kochukrishnan
Unit Manager/Sr. Hydrogeologist
Action for Food Production (AFPRO) Task Force-Bhubaneswar
Orissa
2. Dear Sir, Thank you for the
Dear Sir,
Thank you for the response. I am sure this will help me.
3. Borewell Construction - Advice Required
Dear Shyam,
Taking in to consideration the detail given by you regarding the bore well
Depth of borewell 185 Feet, with 6 inch dia.
Casing done up to 60 feet.
Water was struck from 80 feet with approximately 2 inches of water.
This is a clear indication that the water bearing zone ( aquifer) has been encountered in hardrock nearly 6 m below the casing.
Assuming that
the casing has not damaged while installation
Adequate length of casing has been installed
And you have not encountered any clayey or sandy layer while drilling the bore well further
And the bore well was thoroughly flushed after the drilling operation was over
If this is true, then it hardly matters when you install the pump, provided the well is properly capped and nothing falls in the bore well from top.
It is possible that the yield in summer months of April & May, may not be the same as encountered while drilling.
The only possibility of the well going dry is if some other person drills another bore well much deeper than the present bore well and manages the de-water the aquifer- It is possible but depends of the terrain and not commonly observed.
The possibility of the fractures getting blocked by the clays within it- well this could happen even if the pump is installed, but then you could always develop the bore well by air jetting, or you could also add a anticoagulant, like sodium hexameta phosphate solution ( industrial detergent) to the bore well a day before you lower the submersible pump.
The most important thing to do is to first measure the clear depth of the bore well before you lower the pump in the well.
With Reards
Dr. Anil Lalwani
www.wellwaterworks.com
contactus@wellwaterworks.com
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