Nice question. The point is ...

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Nice question.

The point is what is the purpose for this. Storage or recovery of  one over pumping?

I am more familiar with the second case. If for example you recharge to face a problem of Saline Water Intrusion (SWI) it would be very helpful to monitor with electrochemical sensors (especially electrical conductivity sensors) the progress of decrease of the water Electrical Conductivity (EC) vs time. If you have already EC historical values you will be able to decide and define the correct amount of infiltrated water and to control the recharge process. The hydraulic gradient plays also a significant role. In areas with very low hydraulic gradient (flat plains) the recharged water stays into one specific volume area and it is possible to recover it after long periods. In contrary, you may loss large amounts of recharged water in areas with higher hydraulic gradients. I think that specific hydraulic tests in the recharge area are very useful to give to you one quantitative image on the amounts of water to be stored, prior to proceed.