What is being excavated?
Wellpoint Dewatering South Africa is the construction use of the same technology: a line of points around an excavation, pumped together to hold the water table below the dig so the work can proceed dry. Describe the excavation and compare dewatering quotes.
Describe the excavation and get dewatering quotes.
Get the Best QuoteWhere It Is Used
- Basements. The classic application on a high water table site.
- Foundations. Keeping footings dry long enough to cast.
- Pool excavations. Sandy coastal plots where the hole fills as it is dug.
- Services trenches. Sewer and stormwater below the water table.
- Lift pits and sumps. Deep local excavations in wet ground.
- Tank installations. Underground tanks that want to float.
How a System Works
- A line of points. Spaced around or along the excavation.
- A header main. Connecting them to one pump set.
- Vacuum pumping. A dewatering pump drawing all points together.
- Drawdown. The water table pulled into a cone below the dig.
- Continuous running. Usually around the clock while the dig is open.
- Discharge. To stormwater or an approved point, with permission.
Planning It
- Know the water level. Standing level, before anything is dug.
- Know the depth needed. Dewatering has to reach below the lowest point.
- Allow for settlement risk. Drawing water down can affect neighbours.
- Arrange discharge first. It is the thing that stops jobs.
- Plan for standby. A pump failure at night refloods the excavation.
- Programme it. Dewatering is charged by time as much as by equipment.
Wellpoint Dewatering Prices
Ballpark dewatering figures so you can check a quotation.
| Item | Ballpark price |
|---|---|
| Small pool excavation, set up and first week | R12,000 - R35,000 |
| Dewatering point, installed, each | R1,800 - R4,500 |
| Header main and manifold, per site | R4,500 - R18,000 |
| Dewatering pump hire, per week | R3,500 - R14,000 |
| Standby pump on site, per week | R1,800 - R6,500 |
| Basement perimeter system, set up | R45,000 - R180,000 |
| Monitoring and attendance, per day | R850 - R3,200 |
| Decommission and remove | R3,500 - R14,000 |
Prices JUST UPDATED. Ballpark figures, rounded, excluding VAT. They reflect typical South African wellpoint, pump and water treatment rates. They are not our prices or quotations, and no provider is bound by them. Confirm what each quotation includes, such as travel, the depth allowed for, the dry hole fee, pipework and minimum callout fees.
Get a dewatering plan sized to the dig, not to a day rate.
Get the Best QuoteWhat Affects the Price
- How far the water must drop. The main technical driver.
- Excavation size. Perimeter length sets the number of points.
- Duration. Charged weekly, and programmes slip.
- Ground permeability. Coarse sand yields more water and needs more pumping.
- Discharge arrangements. Distance and whether permission is needed.
- Standby and attendance. Round the clock running needs cover.
What to Include in Your Request
- The excavation dimensions. Plan size and depth.
- The water table depth. From a trial hole or a borehole log.
- The programme. When it starts and how long it stays open.
- Ground conditions. A geotechnical report if there is one.
- Where water can discharge. Stormwater, a canal, or nothing obvious.
- Site access and power. Generator or mains at the pump position.
Before the Dig Starts
- Dewater before excavating. Not once the hole is already filling.
- Sort discharge consent first. It is the usual cause of a stopped job.
- Have a standby pump. One failure overnight undoes a week.
- Watch the neighbours. Drawdown can cause settlement next door.
- Programme realistically. Weekly hire is where dewatering budgets go.
- Agree the decommissioning. Removing the system is part of the job.
Wellpoint Dewatering FAQs
What is wellpoint dewatering?
A temporary system of shallow points installed around an excavation and pumped together, which pulls the water table down into a cone below the dig so the work can be done in the dry. It is the same technology as a garden point, used in a line and run continuously.
How long does dewatering take to work?
The initial drawdown is usually a matter of days rather than hours, and it has to be achieved before the excavation reaches the water table, not after. Once the level is down the system runs continuously until the structure is built and backfilled.
What does dewatering a pool excavation cost?
For a domestic pool on a sandy coastal plot, setting up and the first week commonly lands between R12,000 and R35,000, with weekly pump hire after that. A basement perimeter system is a different order of cost entirely, running from tens into hundreds of thousands.
Where does the pumped water go?
Usually to a municipal stormwater connection, a canal or an approved discharge point, and that normally needs permission. It is the detail most likely to stop a job, so it should be arranged before the points go in rather than on the morning the pumps start.
Can dewatering damage nearby buildings?
It can. Lowering the water table under sandy or compressible ground can cause settlement, and neighbouring structures are the usual concern. On anything larger than a pool this wants geotechnical input and often monitoring, which a competent dewatering contractor will raise themselves.
Dewatering contractors listed on Wellpoint Installers SA quote on the excavation rather than on a day rate alone.
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