After locating a suitable aquifer, drilling is commenced with Air Rotary Drilling. Air rotary relies on high volumes of compressed air to operate the cutting bit called the “hammer” and remove detritus from the borehole.
Air rotary is suitable for all hard rock formations as well as some unconsolidated formations such as sand and clay, providing the operator is sufficiently skilled in this type of drilling. Air rotary is by far the most common as it is the fastest and most efficient method in the above formations.
Once water is encountered, the borehole is cased, which is lined with PVC borehole casing, generally, Nakiso Borehole Drilling uses class 9 or 10 PVC casing.
Once water is encountered, the borehole is cased, which is lined with PVC borehole casing, generally, Nakiso Borehole Drilling uses class 9 or 10 PVC casing.
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| Borehole Casing and Construction By Nakiso Borehole Drilling! |
The borehole must be lined at the full depth of the bore to prevent the collapse of the borehole or the inflow of detritus. If the bore is not cased all the way to the bottom, then there is a high probability that the borehole will collapse on top of the pump, locking the pump in the borehole resulting in the loss of the pump and no water.
Retrieval of a pump in such cases can be a costly and time-consuming task with the chances of retrieving the water boring pump undamaged quite slim.
Once the casing has been installed full depth in the bore, the borehole must then be developed to remove detritus and drilling slurry which will allow the borehole to produce to its full capacity.
Once the casing has been installed full depth in the bore, the borehole must then be developed to remove detritus and drilling slurry which will allow the borehole to produce to its full capacity.
The development of the borehole is also necessary to produce clean clear sediment-free water.
During development, the yield of the bore will be flow tested to determine water volume and flow rate available. This information is, of course, necessary to be able to correctly size a pump to the depth and yield of the bore.
After development and flow testing, the borehole will then have a concrete surface pad constructed around the top of the casing, for support and to impede surface contamination and is then capped.
During development, the yield of the bore will be flow tested to determine water volume and flow rate available. This information is, of course, necessary to be able to correctly size a pump to the depth and yield of the bore.
After development and flow testing, the borehole will then have a concrete surface pad constructed around the top of the casing, for support and to impede surface contamination and is then capped.
The borehole is now ready for a pump to be installed.
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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: +263 867 71 88844
Sales: +263 78 860 8009
Operations: +263 78 860 8005
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Email: info@nakisoboreholes.co.zw
Website: www.nakisoboreholes.co.zw
