How to estimate the amount of groundwater recharge through a recharge pond?

I need your expert suggestions for calculating groundwater recharge over a set period.  

In our project area, we have a pond managed by the community and the primary objective of this pond is to help ground water recharge.

In this case, how do we calculate the amount of water recharged into the ground for a particular year?
We have the yearly rainfall data and topographic details of the catchment. What is the best way to estimate groundwater recharge in this case? 

Also, how can we estimate groundwater recharge when artificial recharge techniques are adopted?

Best,

Amit