The Four Stages Of Borehole Drilling and Construction In Zimbabwe!
Groundwater is undeniably a very important freshwater resource for drinking water supply, irrigation and industry, in addition to its natural role of sustaining river flow and aquatic ecosystems.
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The Four Stages Of Borehole Drilling and Construction In Zimbabwe! |
Stage 1: Site Survey (Groundwater Investigations)
b. Geological formation and setup of the area in question.
c. Recommended drilling depth required. This will influence the cost of drilling.
d. Likely challenges and possible solutions during the drilling exercise.
Stage 2: Drilling and Casing
The drilling stage is the actual exploration exercise carried out using a rig operated on site. Borehole drilling is the process of punching a hole in the ground to extract groundwater. Everything that happens at this point is in reference and under the guidance of the surveyor’s report.After the drilling is completed, the drilling supervisor will provide a report with all the drilling logs mainly reporting on the following.
a. Total drilled depth.
b. Depth to the water strikes.
c. Driller’s estimated yield.
d. Well design and depth to screened water strikes etc.
Stage 3: Test Pumping.
Aquifer Tests also referred to as Test Pumping is done after the drilling exercise is completed. This is a scientific process that experiments with the performance of a borehole. This is done by pumping groundwater from a well, usually at a controlled rate and measuring the change in water level (drawdown) during and after pumping.If this stage is poorly handled, can lead to under pumping or total malfunctioning of the well. And worst-case scenario would be over pumping the well leading to a chain of problems like draining the well and eventually spoiling the submersible pump and its installed components. The aquifer test report will provide the following information that is later used to size a proper pump and power supply during the installation phase.
a. Static water level what some people prefer to term as the water table.
b. Dynamic water level
c. Safe abstraction or recommended pump installation depth.
d. Recommended pumping duration and rest interval to allow for recovery.
e. Discharge rate. This is the actual yield of the well-measured as m3/hr. (litres per hour) which is very crucial while sizing a pump.
Stage 4: Installations
Typically, what renders a borehole useful and complete is the installation of a submersible pump and all the accessories that come along. The most important information needed for a successful installation process is expected from the aquifer test (Test pumping) report. This includes the drawdown and rest water level, the safe abstraction or recommended pump installation depth, percentage of recovery versus recommended pumping duration time.Conclusion: The stages as identified above can only be implemented one after the other. It would be a gamble to cost a single part of the process ahead without completion of the previous step. For example, you wouldn’t know the right size of the pump to install without knowledge of the actual discharge rate, and recovery rate of the well.
We have a substantial presence and experience in Borehole Siting, Borehole Drilling, Borehole Installation, and Solar Systems.
Standard Prices For Borehole Drilling
Borehole Siting (Geo-Survey)
Drilling & Casing (40m)
Standard Class 6 Casing included.
Premium Casing Upgrade
Upgrade to Class 9 Casing for extra durability.
Borehole Deepening / Extra Metres
For drilling beyond 40 metres.
Double Casing
For unstable ground conditions.
Tank & Tank Stand
5000 Litre Tank with a 4-metre Stand.
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