The maximum safe yield of a Borehole represents its dependable and continuous output during a long drought. Homeowners should know their Borehole yield to ensure it can sustain them in demanding times.
The Borehole yield may be found in the Borehole Report created when the Borehole was drilled and its pump installed. Many communities also require a yield test when a property is bought or sold.
What Is A Borehole Capacity or Yield Test? Determining the yield of a Borehole involves a test to see the balance between the maximum amount of water that can be pumped out of the Borehole and the amount of water that recharges back into the Borehole from the surrounding groundwater source.
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| Capacity Testing - Determining the Yield of a Borehole! |
The test requires the continuous pumping of the Borehole for an extended period of time. During the pumping period, measurements are made of:
- The rate at which water is being pumped out of the Borehole and
- The distance the water level is lowered in the Borehole as a result of the pumping, known as the drawdown.
Borehole Drilling professionals rely on the yield pump test to set the Borehole Pump at the correct level. It is common to maintain the water level in the Borehole at least 5 metres above the top of the submersible pump. This depth of water over the pump provides a reasonable level of safety for dry conditions and provides for full cooling of the pump’s electrical motor.
Don’t be fooled by water pressure in the home. Pressure at the tap is not necessarily dependent on ample Borehole yield. Proper sizing of the Borehole pump, pressure tank and distribution lines by Borehole professionals can increase pressure when yields are quite low.
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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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