The quantity and the quality of water can neither be determined nor guaranteed until after drilling of a borehole!

You have done everything you are required to do before drilling a borehole. Reconnaissance, Collection and comparison of historical facts about ground formation for the selected area, Geophysical Survey, etc. But the question is: Can you tell the Exact or Actual Quantity and Quality of water you will get before drilling?

It has become a popular statement that:

The quantity and quality of water in a borehole cannot be determined or guaranteed with certainty until after the drilling process is complete and the borehole is tested.

While preliminary assessments and geological studies can provide some insights into the potential for water availability, the actual conditions can only be confirmed through drilling and subsequent testing.

During the drilling process, various geological formations and aquifers are encountered, and samples of the water and rock formations can be collected for laboratory analysis. This analysis helps determine the quality of the water in terms of its chemical composition and suitability for various uses.

In terms of quantity, the yield of the borehole, or the amount of water that can be extracted from it, can be assessed through pumping tests. Pumping tests involve pumping water from the borehole at various rates and monitoring the drawdown of water levels and the recovery of water levels once pumping ceases. These tests provide valuable information about the sustainable yield of the borehole and its ability to meet the desired water demand.

It’s important to note that drilling a borehole does involve some level of uncertainty, as the subsurface conditions can vary, and the final quantity and quality of water may differ from initial expectations. Therefore, it is recommended to work with experienced hydrogeologists or drilling professionals who can provide guidance, conduct proper testing, and interpret the results accurately.