What to do if agriculture borewell fails?

1) If Agriculture borewell fails, can we restore the water in rainy season to recharge the same borewell. Can a failed borewell be converted into water source borewell to utilise the water in needy days to feed the plants.

2). For three acres of land of plants with agro-forestry method (nearly 4000 plants), what is the agri-pond size and its maintenance process for long term agri activities.