Do lakes actually recharge ground water and by how much ?

A question we often get asked as rainwater harvesters is, is there any point in building a recharge structure adjacent to a lake ? Does the lake not recharge ground water ? Will the recharge structure/well make any difference ? This is a very pertinent question and I can write on what we have seen from experience

Very often you do see old open wells adjacent to lakes. The well used to be the place from where people drew the water for use. The water level in the lake and the water level in the well would more or less be in sync. That seems to indicate that water from the lake would seep out into ground and then into the well. So yes – the lake did send water into the ground which you could withdraw from the well. This is still true in many cases – when the lakes fill up, the wells fill up too. Eg Jakkur Lake

However over a period of time as the lake starts to silt up, the recharge rate reduces and hence the relationship between the water levels in the well and lake might also reduce.

 For instance Kaikondrahalli Lake has an old open well about 40ft deep to its East that is dry. 3 new 15ft deep wells have been dug in the school to the West of the lake. All the wells have water. However these wells are being recharged with rainwater too. Why does the East Well not have water ? Has the well silted up and hence there is no percolation from the lake to the well ? There is a borewell at the bottom of the open well. Has the pumping out of water from the deeper regions emptied out the shallow aquifer ? Is it the artificial ground water recharge and not the lake that is feeding the shallow open wells in the school ? Its hard to say.

 However, one thing that can be said for certain, the lakes dont seem to be having an obvious/hard to miss positive effect on deep borewells in the vicinity. Deep Borewells around the lake continue to dry up or yield less


Well with Water : near Jakkur Lake

DRY old open well – EAST of Kaikondrahalli Lake

Yielding Well in Renuka School – WEST of Kaikondrahalli Lake

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Similar Story

Open well with water: Opposite Kaikondrahalli Kere

Most borewells along Sarjapura Road do not yield much water. A new apartment opposite Kaikondrahalli Kere is also struggling for water as their borewells run dry. The builder decides to revive an old  open well in his property. The well is  18ft in diameter and 40ft deep and has been fully closed with mud. Pedanna the well digger is called in. Alongwith his team Pedanna excavates all the 40ft of mud manually. They strike water at about 20ft below ground level. The water has to be pumped out as they continue to dig. The well is now completely excavated and…

Similar Story

Do deeper borewells actually yield more water ? Do we get more water as we dig deeper ?

Having worked with, seen and spoken to numerous borewell owners, it is apparent that the borewells that yield well; say about more than 60,000 litres of water per day (that are used by layouts, tanker operators, industries etc) are those that are shallower than 800ft. Its not the 1000+ft borewells that yield copious amounts of water. Even if it is a 1000+ft borewell that is yielding a lot of water, a camera inspection will reveal that actually its the shallower cracks that yield more water. Take a look at the attached picture to somewhat make sense of Bangalore's geology and…