Question

Where can one find underground water?

Answer 1

By using geophysical methods (such as resistivity)

Explanation:

There are some methods to detect groundwater. One is resistivity. Resistivity is defined as the resistance to current flow as a result of an applied electric potential. Resistance is measured in ohms. Resistivity is resistence times legnth (such as `ohmtimesm`).

In geophysical surveys resistivity is determined as the electrical resistance per length of a unit cross section area (`ohmstimesL`).

Resistivity below ground zero is a function of material type, porosity, water content and concentration of dissolved (such as TDS) contaminants in the pore water. Generally, dry soils and rock have very high resistance to electrical flow whereas inorganically contaminated saturated soils have a relatively low resistance.