Re-use of existing agriculture borewell

I am having unused borewell of depth 350 feet and 8inches dia. We left the borewell unused for more than 10 years for less water & drought. And surrounding water table gone up to 500 feet, 600 feet, 700 feet deep. Suddenly we checked the borewell, we came to know that the borewell has water at 200 feet depth.

  1. What is the reason for rise of water level in the borewell?
  2. What will be yield of water?
  3. Will it be a reliable source of water or temporary?

Location of the borewell- Tamil Nadu state- Pudukkottai district- Alangudi taluk- Malaiyur village.