Three Categories Of Boreholes

A borehole is a vertical capture engineered structure used to exploit the water from a water table held in the interstices or in the cracks in a rock in the sub-soil known as an aquifer.


The water can be raised to ground level either very simply using a receptacle or more easily using a manual or motor-driven pump.

Boreholes vary tremendously, be it in-depth, the volume of water, the cost or the purity of the water, whether or not treatment is justified before it can be consumed (and should also be checked regularly, not just when the structures are completed).

Boreholes Come In Three Categories:

1. Dynamic.
2. Average.
3. Residual.



1. A Dynamic Borehole: As the drill hits a break, water is ejected out from the hole in a pressurised spray.

2. An Average Borehole: As the operator removes samples of soil or rock drilled -water is evident.

3. A Residual Borehole:
Three Categories Of Boreholes
Three Categories Of Boreholes
A residual borehole is more difficult to determine. The operator can drill past or through one or several "dry" breaks until he reaches the allocated depth with samples not showing any sign of water evident.

To the driller, this might be viewed as a dry hole. With our experience in the borehole drilling industry and with our work with site surveyors ... we have realised that this conclusion is in most cases not correct.

We have done assessments within a week (at least 10 days) and have found reasonable amounts of water (ie. 70%) full.
Three Categories Of Boreholes
Three Categories Of Boreholes
The explanation for this is based on the actions of the drilling or blowing of the rig - which can actually block breaks temporarily and which eventually open with the pressure from the breaks releasing water.

At the time the drilling may appear as a dry hole, however, our experience has shown that given time the breaks will open release water.

Have Faith In Your Site Surveyor: If the surveyor advises you to drill to a certain depth he is doing it through many years of experience.


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Five Facts About Borehole Drilling That You Need To Take Note Of:
1. Know Your Borehole Casings:The Preferred Borehole Casing In Zimbabwe Is Class 9 and 10 (Pressure Classes.)This is because Class 9 and Class 10 Casings are more collapse resistant. The strength of a Casing is often described as collapse resistance.

2. Borehole Drilling Depth: The exact depth, of where the water is located, cannot be established by the drilling contractor nor the Water Surveyor (Borehole Siter).

3. The Is No 100% Guarantee On Water: It is important to note that it is never a 100% guarantee that any hole will yield water, the amount and water quality can also not be guaranteed by the drilling contractor and water surveyor.

4. Borehole Siting or Water Surveying Is Important: Making use of a hydrologist or traditional water diviner will increase your chances of having a successful borehole that will yield a sufficient amount of water.

5. Know The Risks: The risk of the borehole drilling lies with the property owner. The client will still be liable for the drilling costs irrespective of a borehole yielding water or not.

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Business Offices: 65 Churchill Avenue, Alexandra Park, Harare North, Zimbabwe.

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Office Numbers: +263 242 48 0141 and +263 867 71 88844

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Email: info@nakisoboreholes.co.zw
Website: www.nakisoboreholes.co.zw

Nakiso Borehole Drilling - The Best Borehole Drilling Company in Zimbabwe!

Nakiso Borehole Drilling has experience and knowledgeable workforce to work on any type of installation. From solar powered, electrical and manual pump installation, we do it all under one roof. Nakiso Borehole Drilling covers borehole siting, drilling and installation of pumps.