Need for Geophysical Survey:
Good drinking water can be obtained from fracture zones in hard rock. But drilling without site investigation (survey) seldom yields water in usable quantities. Effective water development programs must include carefully conducted geophysical and geological investigations (survey) .
Types of Geophysical Survey :
Ground Penetrating Rader (GPR)
Very Low Frequency- Electromagnetic (VLF- EM)
Vertical Electric Sounding(VES) or Resistivity