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Advice & Consult Required : Rain water harvesting to recharge bore wells - Hennur Road, Bangalore

We have a farm in Bangalore North, Hennur Road, with a number of borewells that have been unsuccesful or dried up. About 5 years back we built a dam across a Nalla (Natural erosion)in the farm, to collect rain water. The size of the Nalla is 300x20 ft approx with a water depth of over 7ft in good rainfall time. This year for the first time, thank God, it has not dried up. Now we find a borewell that was dug over 7 years ago,( about 300ft) with water seen at 20ft itself.

I would like to know if it would be helpful to dig further in that same spot or try another borewell near the Nalla. The water is used primarily for irrigation. Please let me have the contact information of suitable consultants.

Thank you

Daniel Thomas

098440 73437




1. Rain water harvesting on a farm

How big is your farm in acres? What is the yeild of water from your existing well? I assume you are not getting enough water from the existing well and hence thinking of a new well.

I am a water management consultant(you will find me on indiawaterportal) and I would be willing to help you.A visit to inspect your farm would be essential for me to advise you properly.Please call me and we can fix an appointment. My mobile:93437 34229.


2. Dear Daniel Thomas,   From

Dear Daniel Thomas,


From your description it appears that damming the Nalla has been helpful to retain water for a longer time and in the process recharged the bore-well. Deepening the Nala will help if the Nala and the aquifer still remain in continuum. Likewise, another bore-well near the Nala might or might not be helpful depending upon the hydro-geological conditions.  This will require a study of existing bore-logs and their interpretation, if available. If not, it might be helpful to carry out a geophysical survey and interpret the formations and availability of water.




Vijay Kumar


Head-Water Resources/Senior Consultant-Water Resources

DHI-Water and Environment

New Delhi-110019

3. rainwater harvesting on a farm

Dear Daniel,

You are on the right track in providng recharge to the groundwater system locally. Now will this add up to your total demand is the big question. As an optimist i will look at testing this hypothesis by pumping the borewell that has shown the water level at 20'. Test the well by pumping as long as it can be pumped. Then check the time it takes to get back to near the pumping level. Based on this data u can asess the response of nala bunding straucture on the borewells. I will not advise on deepening or new well drilling.



Consultant Water Resources

4. Advice & Consult Required

Dear Sir,

Rain water harvesting helps in the long run.   In the nalla you did the bunding works.  You can also do he trenching works over the elevated part and the recharge would be more effective, the trenching has to be across the slope to retard the runoff. over a period of time the recharge will be good and your bore wells will yield good water.

Have you checked the other bore wells which went dry.  Have these also could get some water.  Have you checked it up. Since this bore well is located close to nalla near the lowest level in the micro catchment, you got the influence of the rain water that you have harvested.  

Now a days drilling 950 to 1200 feet is a common practice.  You can try for new bore wells instead of deepening the old one.

There are lot of consultants available in Bangalore. And they have to plan and study the area by a detailed geohydrological and Geoelectrical studies.

With best wishes,

A. Raja Mohamed Ambalam


Coastal Energy Pvt Ltd

Chennai-  09443619352 


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