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.

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.

Balance, or equilibrium, is achieved when the water level within the Borehole stops dropping for a given discharge rate. Once equilibrium is achieved, less pumping results in less 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.

Partner With Us

About Nakiso Borehole Drilling

At Nakiso Borehole Drilling, we are your comprehensive partner for unlocking reliable water on your property. Our highly skilled team tackles all drilling projects, from standard boreholes to specialized Blast Hole and RC Drilling.

We handle everything in-house for a seamless experience, encompassing expert borehole siting, efficient drilling, and pump installation – solar, electric, or manual – tailored to your specific needs. With Nakiso, your reliable water source is just a drill away.

We don't just strive to be the best; we maintain the industry's strictest quality standards and are committed to sustainable practices for the future of Zimbabwe's water security.

Essential Drilling Facts

Fact 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.

Fact 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).

Fact 3: There Is No 100% Guarantee

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.

Fact 4: Siting 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.

Fact 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.

Our Branches and Our Contacts

Churchill Ave Branch

Business Offices (HQ):
55 Churchill Avenue,
Alexandra Park,
Harare North,
Zimbabwe.

Call Us Today:

Office Numbers: +263 867 71 88844

Sales: +263 78 860 8009
Operations: +263 78 860 8005
Marketing: +263 78 876 6701

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

Bluff Hill Branch

Business Offices:
36 St. Anthans Drive,
Bluff Hill,
Harare,
Zimbabwe.

Call Us Today:

Office Numbers: +263 71 494 0883

Sales: +263 78 860 8009
Operations: +263 78 860 8005
Marketing: +263 78 876 6701

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