Start With The Borehole, Not The Pump
The first job is to work out what the borehole can actually give you. A pump can only perform well when it matches the standing water level, drawdown under pumping, and the depth of the borehole. If the borehole is 60 m deep but the water sits at 28 m, that is a very different job to a shallow borehole where the water rises to 8 m. It sounds simple, yet this is where many installations go wrong.
You also need to know the borehole yield, which is how many litres per hour or per minute the borehole can supply without running dry. If the pump pushes harder than the borehole can recover, it will start sucking air, lose prime and wear out quicker. In Northern Cape conditions, where water can be scarce and dust gets into every crevis, a correct match matters more than a big nameplate rating.
- Measure static water level and pumping level
- Confirm borehole depth and casing size
- Test the yield over a full pumping period
- Check water quality for sand, silt and mineral content
Match Flow Rate To The Real Demand
Once the borehole is understood, look at the demand side. A small home may only need enough water for taps, a tank refill and a garden line. A smallholding, workshop or irrigation point can need a far higher flow. The pump should meet the peak demand without running flat out all day, because constant hard running shortens service life.
A practical way to think about it is litres per minute and hours per day. A pump that can move 60 litres per minute may be fine for a household tank fill, but not for a setup feeding livestock troughs, a pressure system and back-up storage all at once. If you are unsure, size the pump for the actual usage pattern, not the wish list.
- Household tank fill: moderate flow, longer run time is acceptable
- Garden and washing points: steady pressure matters more than high flow
- Smallholding or trade use: allow for multiple outlets and longer daily duty
Head Height, Pipe Size And Friction Loss Matter
Many buyers focus on depth alone, but the total head is what the pump really sees. Total head includes the vertical lift from the water level to the discharge point, plus pressure needed at the tap or tank, plus friction losses in the pipework. Long pipe runs, too many bends, or pipe that is too small all increase the load on the pump.
For example, a borehole feeding a tank 40 m away on a slight rise may need more pump pressure than a deeper borehole feeding a tank nearby. Using pipe that is too narrow can choke the flow and waste power. In our experience, a neat installation with the correct pipe diameter usually performs better than a bigger pump fighting against poor plumbing. That saves power and reduces call-outs.
As a guide, check the full route from borehole to storage tank, pressure system or distribution point. If there is a filter, non-return valve or long lateral run, include that in the selection. A pump selected on paper only for depth can disappoint on site when the line losses are added up.
Choose The Right Pump Type For The Job
Not every borehole pump is suited to every site. Submersible pumps are common for deeper boreholes because they push water up efficiently from below the water line. On some shallower or special-purpose sites, a different arrangement may work better. The important part is that the pump type suits the depth, water quality and daily pattern of use.
If the water carries sand, ask about wear resistance and whether the pump needs extra protection. If the site is on solar backup or runs during load-shedding, the motor rating and start-up behaviour are also important. A pump that starts hard may not suit a small inverter system, while a more efficient unit can be a better fit for daytime solar support.
- Deep boreholes: usually need a submersible setup
- Sand or silt in the water: needs better wear tolerance
- Solar support: check starting load and daily energy use
- Tank filling only: duty needs are different to constant pressure supply
Duty Cycle And Expected Running Time
Duty cycle is one of the most overlooked factors in borehole pump selection. It refers to how long the pump can run and how often it can start in a day without overheating or wearing too fast. A pump that is ideal for short tank refills may not cope well with long irrigation periods or repeated starts across a busy site.
If the pump will run only 20 to 30 minutes at a time, then a lighter duty arrangement may be acceptable. If it must run for several hours each day, look for a pump and control setup built for that load. Heat, voltage dips and frequent cycling all reduce life, especially where supply is unstable or cable runs are long. It pays to plan for the worst day, not the best one.
On many sites in Kimberley and the surrounding areas, we see pumps failing because they were chosen for flow only, while the duty cycle was ignored. A pump can move water well and still be the wrong pump if it is forced to start too often or run beyond its rated use.
A Kimberley Example That Gets It Right
Take a small property in New Park, Kimberley. The owner wants to fill a 2 000 litre storage tank, supply a few taps and keep a garden alive through dry months. The borehole is 48 m deep, water sits at 26 m, and the line runs to a tank on a stand with a few bends in the pipe. In that case, the selection must allow for the true water level, the lift to the tank and the friction in the line.
Now compare that with a workshop in Roodepan needing water for cleaning, staff use and pressure into a holding system. The demand pattern is different, so the expected duty changes too. The right solution is not the biggest motor, but the pump that can handle the borehole yield, daily use and local power conditions without constant intervention.
- New Park and Galeshewe homes often need storage tank filling first
- Kuruman and Upington sites may need extra care for water quality and heat
- Smallholdings often need both supply and backup planning
Do Not Skip Commissioning And Ongoing Checks
Even a good pump can fail early if it is not commissioned properly. Check electrical protection, cable sizing, pressure settings, dry-run protection and non-return valves before the first full run. The first few hours of operation tell you a lot about whether the pump is matched to the borehole or being overworked.
After installation, keep an eye on pressure, run time and water clarity. If the flow drops, the pump may be drawing too hard or the borehole may be producing more sand than before. Listen for changes as well, because a borehole pump usually gives warning before it gives up. Catching small faults early is cheaper than replacing a burnt unit later, and in the Northern Cape that can save a lot of frustration.
If you want a borehole pump that fits the site first time, work from the borehole data, daily demand and expected duty. Get those three right and the rest becomes much simpler.
