I did that 20 years ago. I ...

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I did that 20 years ago. I had a way to measure the volume of the water in the pond every day with an estimate of water evaporation plus water quantity arriving in the pond. The difference was the recharge. The piezometric method described below was more difficult to analyse as water goes horizontaly in different directions on an heterogeneous maner and I needed too many piezo to close my balance. In winter the water evaporation can be assumed = 0