ERI = Electrical Resistivity Imaging.
How to fund groundwater using ERI, also see here.
Groundwater (and other) exploration doesn’t have to be tedious or expensive.
"Expensive is relative" - hiring a geophysical crew is objectively expensive in my book, but not nearly as expensive as the number of boreholes needed to generate comparable subsurface information.
The role of electrical resistivity imaging in geotechnical work
1D ERI - Vertical Electrical Sounding
Survey imaging depth of investigation
Edwards 1977 A modified pseudosection for resistivity and IP
ERI Arrays dipole-dipole
ERI Arrays Schlumberger
ERI Arrays Wenner