Deep groundwater survey.
This is an example of a deep survey created by the Engineering Battalion in Thika, Kenya, during a groundwater exploration training program. By combining three electrode arrays, dipole-dipole, Schlumberger and pole-dipole, in one survey, both high resolution and deep penetration (375 meter) could be achieved. The data set comprising the three electrode arrays was inverted all together using the AGI EarthImager 2D inversion software.

Locating water in sedimentary aquifer.
This example, by Geological Survey of Austria, is part of a groundwater exploration program. The low resistivity area (blue color) near the surface, represents clay (low permeability). The high resistivity area (red color) represents the bedrock. Medium resistivity area (yellow and green) represents area with high permeability sand and gravel layers, where water is more likely to be found. The best place to drill for water would be around coordinate 1150 where there is deep layer of medium resistivity, i.e. most likely sand and gravel. The worst place to drill for water would be around coordinate 700 where the bedrock comes up close to the surface. Drilling in bedrock is more expensive and the only chance to find water there, is to find a water bearing fracture in the bedrock.

Locating water bearing fracture zones in bedrock.
This example shows a successful water exploration survey. A fracture zone in bedrock was located with Sting/Swift resistivity imaging. A well was drilled and it produced more than 100 gallons/minute from the fracture zone at 145-150 feet.