Borewell in the middle of an open well in Bangalore, Karnataka - Need a method to line the open well and do rainwater harvesting

We have a open well 10 meters diameter & 15 meters depth built with stone blocks near Bangalore. There is a bore-well in the middle of the open well. In summer there is no water in the open well , we get water from the bore well.
Is there any method to line the open well & do rainwater harvesting. Good quantity of water can be collected during monsoon.