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Recharging Borewell to Increase Yield - Feasbility?! - Kolar, Karnataka

I am from Kolar, Karnataka. A borewell of 1100 ft was dug in 2001 with a yield of 1 1/2
inches. Currently it has gone down to 1/2 inch. If I recharge borewell via the same well
does it lead to an increase in yield?

Details are as follows:

bore well depth: 1100 ft

casing: 120ft

1st water zone at : 720 ft (below this we didnt get any water source)

motor n pump: 17 hp, 30 stages

It will pump 2' inches of water for 1 minute and 2 minutes will be a gap(no water).

Kindly contribute to the discussion..



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Comments

1. Dear Mr. Reddy, It is an

Dear Mr. Reddy,


It is an alarming case. As the tubewell so deep is showing a declining trend, the groundwater in the vicinity is on the brink of exhaustion.
 
Availability of groundwater, as well as the recharge potential of any particular area or a tubewell is typically controlled by geology of the area.
 
Kolar is situated in typical igneous rock settings of one of the oldest rocks on the earth.
 
In these rocks the most promising zone is the top weathered zone as the rocks down below are very very hard and compat,and as you proceed down below, there is less and less probability of encountering fisured/ fractured rocks.
 
Therefore, the water that you struck at 720 feet was most probably "juvenile water"
Now this water does not have any surface connectivity, and hence no natural recharge. This water is not going to be recharged annually, and therefore it will exhaust. 


Normally even if an aquifer at this depth is connected to the surface, the recharge rate is very very slow.
In this case, the response of your tubewell to recharge shall be good, and the technique can be direct injection in to the tubewell, but there are lots of precautions to be observed in this method so that you do not contaminate groundwater.
Artificial Recharge to groundwater in your area is highly recommended and must be the top priority of the administration and technical departments concerned with water management; otherwise the situation is going to be bad to worse in no time.


Regards,
 
Rtn. Sudhindra Mohan Sharma
PRESIDENT- ROTARY CLUB OF INDORE SANKALP,
 
DISTRICT CHAIR- WATER CONSERVATION
REGION 1, RID 3040


S.S. EXPLORATION ENTERPRISES
GROUNDWATER CONSULTANTS
80, Anurag Nagar, Near Shalimar Township,
A.B. Road, Indore (M.P.) 452-010, India
Tel: 91-731-4034634, Cell: +919425065997
E-mail: hydroexplore@yahoo.co.in
Web: www.hydroexplore.com

2. Recharging Borewell to Increase Yield - Feasbility?! - Kolar, Ka

Dear Sir,

 

Based only on the scanty data it is very difficult to give an advice to the query.  There may be many reason for the yield drop.  

Is it all of a suddern,

if so there might be some one who might have drilled a deep bore well and shared the same source of recharge supply to this bore.  Or the supply conduits might be shared by increased number of bore wells.

This phenomena is common in deep bore wells in hard rock area.  Due source water crunch such drops takes place.  May during the next recharge season the yield will gradually increase and this rise and fall in yield due to seasonal fluctuation of general ground water level is obvious.

There are many field research findings, based on the radiometric studies that the Kolar deep sheeted fracture conduits gets its recharge from the Coorge hills of the Western ghat area.   I is also learned from many of my old colleagues that there are many such deep bore wells in that area that tap water only from deep sheeted fractured strata in this belt.  

Hence the comments by Rtn. Sudhindra Mohan Sharma is not valid in this belt.  As this is not the fourum for such discussions, my advise is to take up all efforts to use this as a recharging bore wells as well as as a utility one also.

Being a fractured conduit,  located at a depth of 720 feet, depending upon its  transmittable characteristics the recharge slug will definitely take place.   If such recharged water does not accelerate away then there will be benefit to the user. Normally, the ground water movement and its velocity is very slow, there is possibility for the slugged water to remain in the vicinity of the regium unless otherwise tapped by some other bore well getting supplied from the same fractured conduit. 

This kind of artificial recharge is being taken up by, to my knowledge, by a countable persons institutes, and it has proved very effective in some places ( Coimbatore and Truppur belt in Tamil Nadu).  

Though the Central Government has alloted huge fund for such kind of recharge the case studies are not seen.

 

My advice is to apt for recharge and it can expect improve in the yield unless other wise the area possess turbulent velocity characteristics due to some structural disturbances as the dip of the fracture will be less. 

 

with best wishes,

A. Raja Mohamed Ambalam

Geophysicist -  bismi1234786@gmail.com 

09443619352

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

3. Recharging a bore well only

Recharging a bore well only stores water in the aquifer, and you will get back only what you put in, and not a drop more. In reality, what you will be able to pump back will be somewhat less than what went in. And you will have to spend a huge amount of energy to pump it back from as deep as 1100 ft.


Harvest the rain water but DO NOT use it to recharge the well. Store it in a tank. This will enable you to use all the harvested water, and with much less energy.


Chetan Pandit

4. It is inaccurate to say

It is inaccurate to say "recharge the well". What you actually recharge is the aquifer, and not the well. Once you appreciate this, it will be clear that recharging an aquiifer only stores the water in it, and you can get back only what you put in, and not a drop more. In reality, what you will get will be a little less than what you put in. And you will spend a huge amount of energy to pump it from as deep as 1100 ft.


Harvest the rain but DO NOT use it to recharge the well. Store it in a tank. That way you will be able to use almost all the stored water, and will a lot less expenditure of energy.


Chetan Pandit

5. thanks

thanks for your  valuable reply sir....  

6. Recharging Wells

Dear Mr Reddy,

There are pros and cons to the whole subject of recharging, before even trying to get to that, My question to you is Have you checked your pump and pipeline and are they in perfect working condition?

This I am saying as you have a very deep borewell, and you have not mentioned anything about the pumping water level in the borewell, what you mention is that you are getting only half inch of discharge fromt he pump- reduced yield of the borewell is one of the reasons, wornout impellers also slowely but steadily lead to a reduction in the discharge, a small perforation in the pipeline also could lead to the same phenomenon.

About Rainwater harvesting- You could easily collect water on surface and use it, but then the question of how big a collection structure would you need to construct, do you have the space for it, will it meet your requirements in summer etc.

About using the existing borewell to recharge the groundwater system, i.e. the Aquifers, (both confined and unconfined) as it has been rightly cited by  Mr Pandit. As long as you do not invest to much in diverting the surface water in to the borewell through a proper filter system I dont think it will harm you in anyway.

With a very thick profile of unconsolidated portion in your area it could prove to be benificial in temporary rising the water table within the area, but as groundwater is always in a dynamic state it will continue to flow away from the point of ingection, your borewell in the present case. Dont expect increased yields over night, and if you continously tend to pump out water even in the monsoon season, it will really not help in recharging the Aquifer system, there needs to be a lean period where the Aquifer stress is minimized or totally eliminated, so that there is increase in the total aquifer storage due to natural and artificial recharging.

I think you should give it a serious thought to this before you go in for any popular idea.

Regards

Anil Lalwani

www.wellwaterworks.com

 

7. Recharging Borewell to Increase Yield - Feasbility?! - Kolar, Ka

Dear Mr. Reddy,

 

I have worked in Kolar Dist for 2 years.  I am aware of the reality.  There are numerous cases of such failed wells.  But I am also aware that there are ways to spot exact location for borewell that will not go dry even in peak summer.  You have to find the spot correctly.  Only an efficient water diviner can help you.  I do water divining, which incidently I learnt during my stay at Kolar.  Presently, I am at Ahmedabad. 

You  may contact a friend of mine near KGF.  He is farmer own large extent of land.  He is Mr. Kashinath - 9343443909.  You may refer may name to him.

With best wishes.

 

P. Ramanujan

email - pramanujan2007@rediffmail.com

 

 

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