What possible explanation will suit a situation where an unproductive water borehole drilled in the wet season suddenly starts producing in the dry season?
This probably has something to do with the geology of your aquifer and where it is getting charged from.
Yes. The aquifer characteristics need to be studied. Also need to see if it is a one-time phenomenon or recurs every season.
Try to log the depth of the borehole water against the rainfall. This will require accurate water height logging, probably using laser, and then matching the correlation to local, and regional, rainfall. It is important is to spread the logging across several well bores spread over an area, but then also carefully logging the thickness and permeability/porosity characteristics of the water bearing layers.
The area is characterized by thick shale/clay vadose zone and we are considering seepage rate at which water gets into the aquifer.
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