Promopol — 1988
Excavation dewatering

Excavation dewatering

We carry out complete dewatering works on construction sites — from choosing the method, through installing the system, to running it for as long as the works last.

Dewatering an excavation means removing groundwater and rainwater from the working area and holding the water table below the excavation floor. Without it the floor turns to slurry, the slopes lose stability, and concreting or pipe laying has to stop. A well-designed dewatering scheme is usually not an extra cost — it shortens the build and removes standstills.

We have experience on large projects: power station blocks, gas pipelines up to DN 1000, expressways, weirs and hydroelectric plants. We also work on smaller investments — residential construction and sewer works.

We run our own modern pump fleet and wellpoint sets from 32 to 100 mm in diameter. We match the method and the equipment to the ground and water conditions of the particular site — not the other way round.

What we do

  • Wellpoint systems (deep dewatering)
  • Direct pumping from the excavation
  • Deep wells
  • Deep and multi-stage dewatering
  • Site and foundation dewatering
Excavation dewatering
Wellpoint diameters
32–100 mm
Coverage
all of Poland
Fleet
our own

A question about scope or timing?

Describe your site to us — we will tell you plainly whether and how we can help.

+48 501 402 502Contact
Before you call

Dewatering methods — which one to choose

The choice comes down to the ground and water conditions, the depth of the excavation and how long the works run. Below, briefly, where each method fits.

01

Wellpoints

When: sandy and sandy-clay soils, trench and structure excavations

The most common deep dewatering method. Wellpoints are jetted into the ground along the excavation and joined by a suction header to a pump unit. One stage of wellpoints typically lowers the water table by about 4–6 m; deeper excavations use further stages.

02

Deep wells

When: deep excavations, highly permeable soils, large water inflow

Drilled wells fitted with submersible pumps create a cone of depression covering the whole working area. Chosen where wellpoints cannot reach the required depth or the inflow is too great.

03

Direct pumping

When: small inflow, cohesive soils, short works

Water is collected in sumps at the bottom of the excavation and pumped out with submersible pumps. The simplest and cheapest method, but in loose soils it risks carrying away soil particles and undermining the excavation floor.

Before you call

What is worth having ready

The more of this you can give us straight away, the sooner you get a specific answer instead of a general one.

  1. 01Site location and the planned schedule of works
  2. 02Excavation depth and the level the water must be lowered to
  3. 03Soil type — geotechnical investigation or documentation, if you have it
  4. 04Length or area to be dewatered
  5. 05Power available on site (400 V) or the need for a diesel drive
  6. 06Where the pumped water can be discharged
Frequent questions

Questions and answers

When is dewatering an excavation necessary?
Whenever the excavation floor sits below the groundwater table. On site you see it as water seeping from the slopes, a soft, “pumping” floor, and slumping excavation walls. In those conditions foundation works and pipe laying cannot be carried out safely.
How far can wellpoints lower the groundwater?
One stage of wellpoints typically lowers the water table by about 4–6 m below ground level. Deeper excavations use further stages of the installation or move to deep wells. The actual figure depends on the soil type and its permeability.
How much does dewatering an excavation cost?
We do not publish a price list, because every site is different — the cost depends on the method, the length of the installation, the running time, the type of drive and transport. We give a specific quote after talking through the conditions on site. Prepare the information listed above and you will have it sooner.
Do the pumps run without stopping?
Yes. A dewatering installation has to run continuously for as long as work goes on below the water table — a break means the water rises in the excavation again. Our piston pumps are built to run 24 hours a day.
Do you serve sites across the whole of Poland?
Yes. Our equipment yard is in Opole, but we have worked in every voivodeship. Transport of the equipment to site and its collection are arranged for a fee — with our own transport or through a forwarding company.

See also