There are four key steps between the time you think of having a borehole drilled and seeing water being pumped out of the earth.
Borehole siting is the initial stage where the exact location for the drilling is determined. There are a lot of methods in use today and the two common techniques of siting in use are, the Traditional Method and the Geological survey Method.
The traditional method, or water dowsing /divining makes use of the Y branch, a water filled bottle, L rods, pendulums etc. This method is used extensively in Zimbabwe and is surprisingly effective. Good water dowers with experience are able to predict breaks, depths and expected yields to a great degree of accuracy. One must use caution in high mineral bearing areas as minerals in the earths crust can mimic the feel of breaks and errors can occur.
At Dalia Drillers, we employ the services of experienced hydrologists who employ various geographical methods to probe beneath the surface. The geophysical methods employed to enable the hydrologists to infer the sub-surface geology of the area to be drilled.
After the determination of the location, the drilling and construction of the borehole will follow. There are many drilling methods in use. Construction of the borehole involves casing the borehole using pipes of a specific diameter, as is the case with domestic boreholes.
After the drilling and construction, we use a yield test to see the potential of the borehole to sustain future usage. A yield test, also known as an aquifer test involves checking the balance between the maximum amount of water that can be pumped out of the borehole and the amount of water that recharges back from the surrounding groundwater source.
The final stage of the whole borehole drilling process involves pumping and piping. The type of pump and piping used depends on the needs that the particular borehole will meet.