Wellpoint Water Tank Installation Cape Town covers adding storage between the wellpoint and whatever uses the water. It is the standard fix when a point yields steadily but slowly, and the irrigation wants a lot of water in a short window.
A tank decouples the two. The wellpoint fills it at whatever rate the formation sustains, and a booster pump empties it at whatever rate the sprinklers need.
Send the yield in litres per hour and your peak zone demand. Tank size follows from the gap between them.
Get a Storage QuoteWhy Buffer Storage Works
Consider a point sustaining 1,200 litres an hour against an irrigation zone that wants 3,000 litres an hour. Run them directly against each other and the pump cavitates within minutes. Put a 5,000 litre tank between them and the point fills it over the course of the day while the zone draws from it for an hour in the evening.
Storage also solves three secondary problems. It gives iron time to oxidise and settle instead of reaching the sprinklers, it lets the formation recover between abstraction cycles rather than being drawn continuously, and it holds a reserve for when the pump or the point is out of action.
Sizing the Tank
| Situation | Typical capacity |
|---|---|
| Small garden, modest yield gap | 2,500 litres |
| Suburban garden with zoned irrigation | 5,000 litres |
| Large garden or low-yielding point | 5,000 – 10,000 litres |
| Estate or commercial landscaping | 10,000 litres and above, often multiple linked tanks |
| Reserve capacity as well as buffering | Size for the largest single irrigation cycle plus a margin |
The practical rule is that the tank should hold at least one full irrigation cycle, and the wellpoint should be able to refill it comfortably within the interval before the next one.
Components
- Tank. UV-stabilised polyethylene is standard. It needs a level, properly prepared base: a full 5,000 litre tank weighs five tonnes.
- Float switch or level control. Stops the wellpoint pump when the tank is full and restarts it as the level drops. The core of the automation.
- Inlet arrangement. Positioned to aid settling where iron is present, rather than stirring the tank contents.
- Overflow. Sized to handle the full inflow and routed somewhere sensible. An unmanaged overflow undermines foundations and paving.
- Booster pump. Draws from the tank to supply irrigation pressure and flow. Sized to the irrigation, not to the wellpoint.
- Low-level protection. Prevents the booster running the tank dry.
- Draw-off point. Set above the tank floor so settled sediment is not drawn into the system.
- Drain and access. For periodic cleaning out of accumulated sediment.
Automated Operation
- Tank level drops below the float switch set point.
- The wellpoint pump starts and fills at the formation's sustainable rate.
- The float switch cuts the pump when the tank is full.
- The irrigation controller opens a zone valve on schedule.
- The booster pump starts on the resulting pressure drop and supplies the zone.
- Low-level protection stops the booster if the tank runs down.
Two pumps, two protective devices and one tank. Nothing needs a person once it is set up correctly.
Tank Costs
| Item | Indicative range |
|---|---|
| 2,500 litre tank, supplied and installed | R6,000 – R12,000 |
| 5,000 litre tank, supplied and installed | R9,000 – R18,000 |
| 10,000 litre tank, supplied and installed | R16,000 – R32,000 |
| Tank base preparation | R1,500 – R6,500 |
| Float switch or level control | R900 – R2,500 |
| Booster pump and controls | R4,500 – R12,000 |
| Overflow and drainage | R650 – R2,800 |
| Inlet filtration | R900 – R4,500 |
These are indicative Cape Town market ranges, not a quotation. Wellpoint pricing moves with depth, ground conditions, access and the pump specified, so treat these as a budgeting starting point and compare written quotes on what each one actually includes.
Ask what happens if no usable water is struck, whether the pump, controller and electrical connection are in the price, and what the guarantee covers.
Practical Points
Tanks need a level, load-bearing base. Sand, uneven paving and untreated soil all lead to settlement and split fittings, and on the sandy ground where wellpoints work best that matters more than usual.
Sunlight is the other consideration. Clear or light-coloured tanks grow algae, and a shaded or dark UV-stabilised tank stays cleaner. Sediment accumulates on the floor regardless, so plan for occasional cleaning out.
Tank water is not potable water. Storage does nothing for microbiological safety, and stored groundwater should be treated the same as water straight from the point. Broader system detail sits on Wellpoint Installation Cape Town.
Related Services
Frequently Asked Questions
Why put a tank on a wellpoint?
To bridge the gap between a steady, modest yield and a short burst of high irrigation demand. The wellpoint fills the tank slowly over hours, and a booster pump empties it quickly when the irrigation runs.
What size tank do I need?
Enough to hold one full irrigation cycle, with the wellpoint able to refill it before the next one. 5,000 litres suits most suburban gardens; larger properties and lower-yielding points need more.
Do I need two pumps?
Usually. The wellpoint pump fills the tank and a booster pump supplies the irrigation from it. Each is sized for a different job, which is precisely why the arrangement works.
Will a tank improve my water quality?
It helps with iron and sediment, because both settle out given time and the draw-off is set above the tank floor. It does nothing for salinity or microbiological safety, and stored groundwater is no more drinkable than fresh.
What stops the tank overflowing?
A float switch or level control that cuts the wellpoint pump when the tank is full, plus a physical overflow sized for the full inflow as a backup. The overflow needs routing away from foundations and paving.
Can I connect a tank to my existing rainwater tank?
Technically yes, but think it through. Mixing supplies complicates level control, and if the rainwater tank is used for anything with a quality requirement, adding untested groundwater to it changes that assessment.
How often does a tank need cleaning?
Sediment accumulates gradually, so every few years is typical on a domestic system, more often where the water carries iron or fines. Fitting a drain point at installation makes it a much simpler job later.
Get a Tank Installation Quote
Tell us your wellpoint yield and your peak irrigation demand.
Free to use, no obligation. Requests go to LEADERR APPROVED wellpoint installers covering your part of Cape Town.
Client Reviews
Powered by leaderr
