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Borewell Troubleshooting : Consultants Required - Andhra Pradesh

My 7 acre farm is located at Parsapally Village, Kohir Mandal, Medak District, AP. I have recently dug a borewell with following datapoints:

1.  Depth:  350 feet - 6.5 Inch dia

2.  Casing - 85 feet (MS casing pipe).

3.  Perforations in casing - start from 55 feet depth to 85 feet

4.  Yield told by drilling operator:  2 inches

As per the operator, we struck water at 60 feet (2 inches) but did not get water later.

May I request this esteemed forum to advice:

1.  What is the output in litres for this 2 inches yield can be extracted.

2.  What capacity submersible pump is suitable for the above well.

3.  Do you suggest wire-rope (for pump protection)?

4.  Will the yield capacity go up during rainy season?  We drilled on fag-end of summer season.

I plan to use drip irrigation extensively.

I intend to dig another borewell after constructing my farmhouse.  Can you please supply me with locally available hydrogeologists contact information so that I can take their help in new drilling point.





Dear Sir,

You have informed that you got water at 60 feet but what is the water level when you see it on the next day early morning or the so called static water level, which is always dynamic.

To know in terms of liters of the possible conversion depends on the rise in water level also. Hence without the knowledge of the position of the static water level. What ever the yield in liters is only hypothetical.

But 2" supply while drilling normally meet about 100 to 150 LPM (liters per minute). in your case it may correspond that if the water level stands at say about 20 feet. or near to that. You have a supply of say 2 " yield at 60 feet. If the general ground water table goes down then slowly your discharge will decrease what ever pump you fit. Drilling in summer or winter or rainy season does not change the yielding zone but increases or decreases the discharge.

During rainy season it will pick up and again depends on how much you get the rain recharge.

Since it is only 60 feet, you may dig an open well encircling the bore well, you may get more yield than your proposed submersible pump fittings.

Again selection of pump depends on the water level and the pump performance. May be a 3 stage impeller pump with 2.5 h.p would suit your bore that can be fitted at about 75 feet since you do not have a source below 60 feet.

Even some of the low dia single phase submersible 2.5 h.p pump provide 100 LPM water. Better you discuss with the pump distributor and fit a suitable pump. Our discussions are merely based on the past experience and certain positive assumptions.

It is advisable to fit a wire rope to safe guard the pump set. Now a days almost all the agriculturist use the nylon rope.

Normally during rainy season the yield increases. Since your bore well got water at 60 feet you stand to get a better yield during rainy season.

With regards,
A. Raja Mohamed Ambalam
Coastal Energy Private Limited
Chennai- 600006



Dear Aidroos,

According to what you have written it seems that you have struck water only at 60 ft, or may be a bit more until 85 ft but nothing below that.

Answers to you Questions below are:

1. What is the output in litres for this 2 inches yield can be extracted.

Ans: When measured on a 90 degree V- Notch the equivalent is 3300 Liters Per
hour, but as the drilling rig (airlift method) is a very low efficient pumping system when one installs a normal pump one could expect upto 5000 Liters per hour. This would be about 80 LPM

2. What capacity submersible pump is suitable for the above well.
Ans: As the working head is not much

I would advice Crompton make model 4W6Cl which is as 6 stage, 0.75 (1.0)hp which is capable of delivering approximately 80 lpm at 31 meters.

Or a 4W7C1J which is a 7 stage 7 0.75 (1.0) Hp pump
which is capable of delivering approximately 80 lpm at 33 meters.

But then as you have mentioned that you wish to install drip irrigation, the pump should be able to develop the desired pressure, this means that for every Kg of pressure requirement for your drip system you require the pump be capable of delivering water up to 10 kg. for eg if pressure requirement is 1 kg working head is 10 meters.

I assume that you drip will be working at a pressure between 1.5 to 2 kg in this case i feel that the pump model 4W9C1.5TP which is a 9 stage, 1.5 hp pump will be better suited.

3. Do you suggest wire-rope (for pump protection)?
Ans: It is always advisable to install a small diameter( 5mm) plastic coated wirerope as safety, especialy when you are lowering the pump on PVC or HDPE pipes.

4. Will the yield capacity go up during rainy season? We drilled on fag-end of summer season

Ans: I do think that the yield would increase in the monsoon season, especially due to the fact that you have struck water in the un-consolidate overburden.

I dont know if you took advice from a Hydrogeologist to drill this well, if the answer to this is 'Yes' then the depth you have been advised is totally wrong and the person does not understand how to interpret the hydrogeological data collected in field.

If you have not consulted any Hydrogeologist this time, why do you want to do so for the next well.

Ideally I would either construct a large tank or excavate a small diameter well down to 65 ft for future use- that is if it is really required. Which is really doubt.

Hope fully I have managed to provide you with the answers to your questions.


Dr. Anil LAlwani

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