Groundwater recharge rate - ...

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Groundwater recharge rate - best method is to use a deep soil moisture probe. Several manufacturers sell probes up to 400 feet long. Measuring a) the volume / quantity of water in the catchment/reservoir using property geometry and water depth; and, b) the water saturation (corrected for soil type) at each interval, one may infer the water recharge. To be even more accurate, include evapotranspiration (Et), rainfall and measured water flowing into the catchment.  Most owners of groundwater reservoirs assume a 1:1 relationship between water in surface storage and water percolating into underground reservoirs.  It is more likely that some water moves horizontally.  Good luck with your project.