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Low Yield Borewell - Basapura, Bangalore: Solutions?

We got a borewell dug in Basapura, near Begur Lake on 6th March 2011.

Details are as follows: We hit the rock at 45 Feet, MS Casing was done till 64 Feet. We got first water source at 130 Feet. Second water source at 580 Feet. At 580 feet we got some water but driller was not sure if it is coming from same source (130 feet) or new source. We drilled further till 615 feet and then as suggested by my geologist we stopped drilling.

Driller measured the yield and it was close to 1 inch but he gave certificate for 3/4 inch only. We did not get any silt after hitting the rock and was continuously drilling on soft rock.

We need water for 2-3 apartment (total for 12-15 people only). Driller was telling yield is not good but sufficient for 3-4 family. Also since the drill was done in march there is little possibility of getting more yeild in rainy season (as told by driller)

Since this is 30X40 plot and limited location for drilling one more bore-well.

Please suggest if the yield is sufficient for 15 people usage and what kind of pump and cabling I should go if you think yield would meet our requirement.



Regards

Vicky

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Comments

1. Low Yield Borewell

 

As per your description, you have struck water at 130 Feet.

Second water source at 580 Feet ( not sure)

Yield measured nearly 1inch- reported to be 3/4 inch.

Assuming that you have got only 3/4 inch of water- this is equivalent to nearly 400 lph and nearly 8800 Liters per day. when properly managed using proper pumping system.

The other thing that one needs to keep in mind that the yield recorded with the drilling rig using airlift method is not very accurate, becasue the system is itself effecient, and there are a lot of measurement losses.

One usually get more water than that has been recorded while drilling.
As you have got water at 130 ft, and suspected that there is water also struck at 58ft, I would suggest that you lower the submersible pump to 580ft, a 1.5 hp CRI pump model S4S1/36, or any other equivalent model from some other reputed company in your area- this would be ideally suited.


Use a level control panel with lower sensor at 570 ft and upper at 140ft, This should be good enough for you, to ensure that the pump is switched off before it runs dry.

You can expect upto 40% more water than what the driller is suggesting. and this water should easily suffice for 12- 13 people .

If the yiled is not as per the drillers report you could always think of the extreme measure of drilling one more borewell. (which I sincerely doubt)

All the best.Dear Vicky,

 

Dr. Anil Lalwani
www.wellwaterworks.com



2. Thank you Dr. Anil... Your

Thank you Dr. Anil...

Your response is very helpful... I would go for your suggested pump .... Please also suggest the cables & pipes (if you have some specific suggestions...)....

 

Thanks again...

Thanks & Regards

Vicky Jaiswal

3. Dear Vicky, Several points

Dear Vicky,


Several points need to be looked at: Is the drilling as per the State norms for bore wells? Whether any qualified and licensed Hydrogeologist gave the technical report before drilling? Or The Specialist was approached after the drilling result was found unsatisfactory. Whether the drilling rig company employed qualified Hydrogeologist? Such information, if collected by Arghyam over years, would be useful in making effective policy priscriptions / suggesting field practices.


Coming to the subject, one notes that the Begur/Basapura area is already declared grey area as far as ground water depletion is concerned. Modernisation of Begur and Basapura lakes 1 & 2 after removing encroachments and diverting the sewarage and other polluted waters from entering the lakes would go a long way in improving the water situation. Water harvesting structures in the upper reaches of the tanks, if land is available (!), would bebenficial. Locals should apply collective pressure on the water authorities and local politicians for achieving the same. Roof rain water harvesting is a must.
One 5 or 7.5 HP submersible pump may be installed at a depth of 150 feet for testing the bore well for water yield, if there are no yielding zones deeper than 130 feet. Step test is recommended.
The submersible pump for regular use should not be installed at depths deeper than 130 feet, if there are no water yielding zones deeper than 130 feet. Well logging (geophysical) of the bore well is recommended to determine the depths to various water yielding fractures, if any. State / Central Ground Water Board / AFPRO, Bengaluru, have geophysiscal well loggers.
Arghyam may consider starting one State of the Art - water quality lab for rendering services on cost recovery basis. Such services are not available to the ordinary people.


With best wishes and regards,


C. Udaya Shankar 
Geologists

4. Low Yield Borewell - Basapura, Bangalore: Solutions

Dear Vicky,


I will suggest only hydrofracturing as the remedy for your low yield problem.


Drilling a new well attracts huge cost, time,space etc.


Success rate of Hydrofracturing is upto 95% in Bangalore and cost is only Half the cost of a New Borewell.


For details call 094470 87293


NEERADHAN


Geologist,


Trivandrum


 

5. Dear Vicky, Several points

Dear Vicky,


Several points need to be looked at: Is the drilling as per the State norms for bore wells? Whether any qualified and licensed Hydrogeologist gave the technical report before drilling? Or The Specialist was approached after the drilling result was found unsatisfactory. Whether the drilling rig company employed qualified Hydrogeologist? Such information, if collected by Arghyam over years, would be useful in making effective policy priscriptions / suggesting field practices.


Coming to the subject, one notes that the Begur/Basapura area is already declared grey area as far as ground water depletion is concerned. Modernisation of Begur and Basapura lakes 1 & 2 after removing encroachments and diverting the sewarage and other polluted waters from entering the lakes would go a long way in improving the water situation. Water harvesting structures in the upper reaches of the tanks, if land is available (!), would bebenficial. Locals should apply collective pressure on the water authorities and local politicians for achieving the same. Roof rain water harvesting is a must.
One 5 or 7.5 HP submersible pump may be installed at a depth of 150 feet for testing the bore well for water yield, if there are no yielding zones deeper than 130 feet. Step test is recommended.
The submersible pump for regular use should not be installed at depths deeper than 130 feet, if there are no water yielding zones deeper than 130 feet. Well logging (geophysical) of the bore well is recommended to determine the depths to various water yielding fractures, if any. State / Central Ground Water Board / AFPRO, Bengaluru, have geophysiscal well loggers.
Arghyam may consider starting one State of the Art - water quality lab for rendering services on cost recovery basis. Such services are not available to the ordinary people.


With best wishes and regards,


C. Udaya Shankar 
Geologists


 

6. Dear Vicky, No need to drill

Dear Vicky,


No need to drill any more well. Properly develop the well and use a low capacity of pump. The required demand may be met from intermittent pumping.



With regards,


D. Chakraborty
Scientist
Central Ground Water Authority (CGWA)
New Delhi

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