What is a Hydrogeological Survey?
A hydrogeological survey is a scientific method used to detect the presence, depth, and quality of groundwater beneath the earth’s surface. These surveys help determine where to drill wells and what type of well is needed (shallow, deep borehole, or solar).
How a Hydrogeological Survey Works
A hydrogeological survey begins with a visual assessment of the land, where a trained surveyor looks for clues such as dry lake beds, valleys, or certain types of vegetation that may indicate the presence of water. These surface signs help narrow down the most promising locations for further testing.
Once potential drilling sites are identified, the surveyor uses an electrical resistivity meter to measure how well the ground conducts electricity. This is a key part of understanding what lies beneath the surface. Water-saturated soils and fractures conduct electricity better than dry rock, so by sending a mild electrical current into the ground and measuring how it returns, the surveyor can map a subsurface profile. This profile reveals the potential location of an aquifer or a water-filled fracture in the rock, increasing the chances of drilling a productive well.
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