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Borewell Performance Issues - Stabilise & Improve Yield - Kerala

Dear Sir,

 

I live in a hilly region called Attapadi in Kerala. I have sunk a borewell.

We hit rock after 80 feet of drilling hence 80 feet casing used. Further we drilled up to 575 feet. We hit water intermittently and the borewell people said we would get about 1and a half to two inches of water.

A 7.5 Hp pump was installed with 2 inches pipe. The well was used after 3-4 months of drilling the borewell.The motor at the beginning  would pump for 45 mins to 1 hour and then cut off. Restarting after a switch off for some time would result in the same phenomenon. Currently the motor runs for 2 to 3 hours, and with a break for one hour it runs the same.

Can you please explain why this behaviour by the borewell. is there any way I can improve the performance of the borewell. Also as soon as we finished drilling the borewell, there was a hissing kind of noise happening inside the bore, like the water was flowing elsewhere. Would appreciate any kind of advise.

 

thank you

 

Raghuram Murugesan

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Comments

1. low yielding borewell

Dear Mr. Raghuram,


I understand that you have a moderately yielding borewell, but it is not sufficient to meet your requirement.


Since you have stated that while drilling they hit water intermittently, it is clear that the rock formation is modrately or even highly fractured. I will suggest two methods inorder to tackle the situation. First and foremost is hydrofracturing - a method by which water is injected in very high pressure as 3000 psi, through the borewell and hence the fractures as fractured further so that the yield is improved considerably (100-500%).  Second, drill one more borewell. My preference is the first one since the chance of success is high and costs only 60-70% of a new borewell.


All the best


Neeradhan,


Geologist


Trivandrum


094470 87293.

2. Borewell Performance Issues


Dear Raghuram Murugesan


,AS per what you have described the hissing sound on completion of the drilling operation, and the gradadual improvement int he performance of your borewell- This is indicative of A Phenomenom technically reffered to as DELAYED YIELD.


The Hissing sound you were hearing, was air/water entering your borewell, and the aquifer gettign connected to the borewell, by pushing the water/air from the intermittant spaces in to the newly drilled borewell. if water would move out you would not hear the sound.


This is caused The well while drilling was not subjected to adequate/ proper development by air flushing, and may be the cracks and joints through which the borewewll is connected tot he aquifer are blocked, eithere due to the powder generated while drilling or due to the weathered material which already existed there.


 Any Submersible pump of 7.5 hp capable of delivering water from this depth woudl have an average discharge of 100 lpm, assuming that that borewell swl is at 50 ft and you have installed the pump at 550ft, the total water column is only 3000 liters, and if you pum worked for 45 min it has deliverd nearly 4500 liters.  and currently it runs ofr 2-3 hours and after a break of 1 hours runs again for the same ammount of time. which suggests that the borewell is getting developed due to pumping and the yield is gradually increasing as more and more connections are getting cleared- It wont surprise me  if you have suspended mater in your borewell.


My personal advice is to throtel (reduce with a control valve)  the discharge of the pump slightly ( about 10%) and use the borewell, there is a slight  difference in the discharge obtained with your pump(no mention made of that) and the actual yield fo the aquifer. by doign this you coudl manage to run the pump for longer period of time, and fi you get a perfect match it could also run for 24 hours nonstop.


There are good chances, that after one good season of rain the borewell gets fully developed and you get a better yield from it.


You can alsways undertake the risk of hydrofracturing but it cost a lot and ther is really no gurantee that yield will increase substantially.


This all depends on what is your daily requirement of water, if it can be fulfilled with the existing setup this then why waste money?


Dr. Anil LAlwani


www.wellwaterworks.com

3. Dear Raghuram, The well

Dear Raghuram,


The well according to his drillers would give him approx 1.5 to 2.0 inches of water. In my opinion this is a poor yield and such a well can at best be pumped for not more than an hour and then given an hour to ' recover' before being pumped again.
The information you gave in your query supports my suggestion. It ran for 45 mins to 1 hour when the well was first put into use and stop after which it would yield water again after re-starting.
I recommend that 1 hour run and 1 hour stop to let the well recover be followed strictly.


Regards


S.S.Ranganathan
Advisor 
Ion Exchange
Bangalore

4. Response to my query on my borewell problems

Dear Sirs,

Firstly, I would like to thank all who have taken the time and effort to respond to my queries. I would like to know more about hydrofracturing and how it works. For example how much would it cost to hydrofacture my existing borewell? Does it have to be done with the same boring machinery used to drill the borewell? The water i am receiving now is not sufficient for my irrigation purposes and I am planning to sink another borewell. I mainly grow coffee, cardamom and pepper. My cardamom especially has a large requirement of water. Last time I used a water diviner who used the pendulum, coconut and the wishbone stick methods to find the drilling spot. I have contacted a borewell company which supposedly uses a failproof method of determining the depth and yield of the borewell using some kind of computer based equipment. I would like to know more about this method and its reliability. They charge Rs.4500/acre and they would survey any number of points in that one acre. If we move to another acre of land then they charge another Rs.4500 and so on.Drilling of course starts at about Rs100/ft.  They guarantee that water will be struck according to their predictions and will not charge us for drilling if proven otherwise.  I have 45 acres of land in a hilly terrain and I would like to get a point which has a high yield (at least 3" and above), vehicle accessible point for drilling and at the lowest depth. What kind of strategy should I use ? If the same drilling machine can perform the hydrofracturing of the existing well, it would be to my advantage. Do you have any other suggestions.

Also if i reduce the output of the borewell with a control valve, will it not exert undue pressure on the pump and motor? Is it possible that, as the borewell was not used for 3-4 months after being drilled caused the yield to decrease? My pump and motor is at about 550 feet, how do i know if suspended matter is choking my yield? Would not the suspended matter be pumped out over time or will it accumulate over time and jam the pump at some point of time?

I do not have any knowledgable persons to discuss these matters with and hence I apologise if my questions are a little basic.

 

Thanking you

 

Raghuram Murugesan

Varagambadi Estate

5. Borewell Performance Issues - Stabilise & Improve Yield - Kerala

Dear Sir,

As discussed in earlier replies by othersw, in the first half you are pumping the stored water in your bore well and in the remaining quarter or half an hour actually you are puming the water from the aquifer.   It is unfortunate, the yield is low.  If the utility is for doemstic the yield may be sufficient and if its for agriculture purpose it is very meager.

To be practical, you may need a new bore well if the utility is for farming or the allied one.   The geo hyerological fact is that along the Attappadi Ghat - Kanuvai- Thadagam belt there exists a wide underground lineament that conduit ground water from the high rainfall Western Ghat area into the thadagam- Kanuvai belt and through Tirupur - Mangalam its meets the Cauvery river fault some where near Kodumudi.  As such there will be lot of joints and fractures along this lineaments.

May be your bore well might have missed these underground conduits, that is revealed at about 250 to 300 feet some where in Veerapandi Village just close to the foot hills of ATTAPADI hill ranges, along the Coimbatore side. It is advisable to re-explore your lands and locate a suitable site and drill new bore well.

For your query "Can you please explain why this behaviour by the borewell. is there any way I can improve the performance of the borewell."

In case if you want to develop the same bore well then you can go for Hydro-fracturing or blasting underground with explosives after carfully employing approriate tools and know-how.  This will connect your bore well if at there are groundwater micro conduits with in the range of your measures.  If these techniques are out of your reach then better you opt for a new site or further deepen your bore by taking some chances. 

The hissing sound immediately after siezing of drilling may be due to the returining of the compressed air into your bore which had escaped into the surounding area through the dry fractures.  Your bore well water might not excape into the area as you have put your pump at 550 feet and water that come into the bore first fills the bottom and rise up.  When you are pumping this should yield continuesly if at all there were some good water flow without our knowledge comming and vanishing.

The delayed yield phenomena and the bore well was able to recoup with in an hour indicates that there may be some water flowing fracture / joints in the vicity of you bore.  Due to the dynamic nature of the ground water system, it is contributing less into your bore and flowing towards east due to the Geohydrological set up I explained earlier.

 

Now please take your own decision depedning upon your time and financial position. 

 

With best wishes,

Raja Mohamed Ambalam

Geophysicist

Chennai- 9443619352

A. RAJAMOHAMED AMBALAM GEOPHYSICIST COASTAL ENERGY Pvt Ltd, CHENNAI +919443619352

6. Dear Raghuram, As suggested

Dear Raghuram,

 

As suggested by Mr. Rajamohamed, go in for a new borewell.  Please ensure that you get the right point for the new borewell.

 

In case you need any help in finding the perfect point you may contact me.  Presently I am at Ahmedabad.  But I will be there is Kerala in April/May.

 

Ramanujan

pramanujan2007@rediffmail.com

7. Suggestion for choosing the borewell point

Hello All,

We are planning to construct a house in Velachery, Chennai. We called the water diviner and he has marked only two places in the plot, one in north east and another in south west. We cannot choose the south west as there is a staircase as per the building plan. So, we need to work on the north east point only. As per the water diviner, he said we would get water only if the well is dug at that place. However, the issue is that it creates a space constraint, ie, it reduces the living area by 2 sq. feet. Hence, we called the water diviner again and he has marked another point which is just 9 inches far from that point, which I feel is contradictory to his previous analysis.

We prefer to push the borewell point a little further away, ie, 1' 3" from the current point. Please advice:

1) Will this have a huge impact?

2) I am surprised when I hear that 'ONLY' that particular point in the entire site in the north side will fetch the water.

3) My adjacent plot owner (behind my house) had dug in the north east initially, since he didn't get the water, he dug the well again in south west. How do we proceed further?

Please advice.

Thanks,
Sujatha

8. Need hydro-fracturing tools and advice

I'm expecting to be in Kerala next month. I wonder if I can get advice on best hydro- fracturing equipments and other ground water tools (water table, well depth indicator, water pressure gauges, >6 inches flow meter, water well camera)

Thanks a lot

9. What precautions need to be taken while operating a borewell?

Dear Sir

Is it ok if we run the bore well once in a week? I also want to ask you about what precautions need to be taken while operating bore well.

What are the special precautions that need to be taken during rainy season. If bore well does not run for long time, what will happen? Is there chances that we will not get water?

Please tell us.

Thank you,

Santosh Kadam

10. Able to punp water from borewell for only an hour - Please help

Hi all,

Recently got a bore well drilled in our site whose specifications are

  •     Depth-500 ft
  •     Bore well yield - 1.5 to 2 inch of water
  •     Submersible pump installed at 450 ft

Till 100ft we got mud, so casing is done till 100 ft. after that at 400 ft we hit rock then got water, but still proceeded till 500 ft. Even after that we hit only rock and then stopped drilling. Now the problem is, we are able to pump water for only 1 hour from the bore well. Afterwards, the water cannot be pumped out even though the motor is switched on. If we try pumping water out from the borewell after 4 or 5 hrs of initial discharge again we get water for around 30 to 45 mins.

Is it a common phenomena? or does this problem become worse as the days go by. Does this affect the submersible motor installed in borewell (if it runs without pumping out water)? Somebody please answer my query ASAP.

Thanks in Advance,
Chethan Kumar

11. Water yeild in borewell increased, how has this happened?

I drilled the borewell around 9 months back in Pune city. Initial yield was 260 ltrs/10 minutes. Presently over the last 4 days the yield has increased & I could run the pump for half an hour contintuously. How has this phenomenon happened ? What is the scientific reason behind increased yield ?Can any body throw the light on this issue ?

Sunil
09890659346

12. Do a borewell scan to get a clear picture for increase in yeild

Hi Sunil,

There are many reasons for increase and decrease in water level. If you want to know the details in a scientific way you can do a borewell scanning and you will get a clear cut picture of your borewell. Currently we are handling all types of borewell queries, like bore hole scanning, repair , drilling , re-drilling (re-bore). Please contact A2z borewell solutions at #9019940085 or 9538813331.

Regards,
Madhukar Gowda

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