WHAT THE EVIDENCE SAYS
Researchers collected 110 vertical electrical sounding profiles and used 40 boreholes for comparison. Interpreted aquifer thickness varied substantially, around 2.5–46 metres; the modeled-versus-observed thickness relationship was reported with R-squared around 0.885 in the local sample.
WHY IT MATTERS / OUR READ
Groundwater exploration is better treated as an iterative screening process: geophysics narrows candidates, then boreholes, yield tests, chemistry and local drawdown history resolve which locations can actually supply water.
CAVEATS / UNCERTAINTY
Electrical resistivity is influenced by sediment composition and salinity; model fit at local calibration points is not transferable proof of aquifer productivity, recharge rates or drinking-water quality.
SOURCE
Water Science · Walajabad electrical resistivity groundwater study
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