Water environment services


 Our obligation is to protect and improve our waters, and to prevent negative effects of human activities

Clear water

Waens silt curtain stop the silt from worksites from spreading in the water

Quiet waters

Our bubble curtains are tested to protect aquatic life against damage from underwater blasting and noise

Living waters

Sediment treatment to remove excess nutrients and pollution, stop deoxigenation

This is what we do

Bubble curtains Silt curtains Sediment treatment

The bubble curtiains prevent damage from explosions and pile driving, Silt curtains prevent particle spreading from worksites into waters

All installations and services are tested in real life, effects are controlled and documented.  Silt curtains effects are monitored by automatic tubidity buoys, bubble curtains by noise detectors, sediment treatment by sample and flow analysis

Scroll down if you want to know more.

This is how it works and looks

Our Solutions

Photo by: Dronefoto Ålesund

Bubble curtain

The bubble curtain let compressed air out into the water column through a number of small orifices. The great number of small bubbles created rises slowly to the surface. The sum of the surface area and volume of the air bubbles affects the water environment in a number of ways, and can help;
- reduce noise and pressure vawes
- transport bottom water to surface
- prevent ice
- stop silt and debree

Easy installation

The Waens bubble curtain construction makes it easy to transport, assemble and mount. Powerful installations can be mounted by small crafts, without the need for barges and cranes.

Silt curtains

Human activity at shores and in waterways mix particles from land or seabed sediments. The particles may carry pollutants and will cloud the water. The silt curtain provide a physical barrier, letting water through, holding the particles back.

The right solution

We supply solutions for every challenge from the single curtain for a excavated pipe landing to complexe curtains in streaming waters, passable for ship traffic, curtains with oil stop, just ask!

Sediment treatment

Generations into the industrial era we have left an abundance of excess nutrients and toxic waste in our waters. Today this is sitting in the sediments, slowly leaking into the water bodies, causing algae bloomings and other ecological problems.

Stop the internal strain in water bodies

The leaks from the sediments make a severe internal strain on a lot of waters. Treatment of the seabed either by removing nutrients/pollutants or fixating them in the sediment is needed to improve ecological status within a reasonable timeframe. Waens know the solutions.


From our blog

Bubble curtains kills underwater noise

Test installations of bubble curtains showed massive noise reduction from underwater blasting with charges up to 1800 kg TNT. The Norwegian Coastal Administration; Kystverket, had decided to do scientific testing of the effects of bubble curtains on underwater noise.  They did the testing in connection with real life underwater blasting works in the harbour of…

Silt curtains in Oslo

Previous Next Silt curtains in Oslo The eastern Oslo City Centre at Bjørvika in The Oslo Fjord is undergoing extensive urban development.  Along the Akerselva river towards the fjord, new commercial buildings and cultural buildings are being built, among them the new Munch Museum, which is being built opposite the opera house. The construction activity…

Dredging of phosphorus-enriched sediment layers

At a lake restoration in Sweden, thin layer sediment removal successfully removed a 5 cm phosphorus enriched top layer of sediment in lake Rålången. The sediment was leaking nutrients causing algal bloom, euthrophication and anoxia in the lake and waterways downstream. Now the sediment is removed and will be pelleted fertilizer.

Our water life

Sea fever

                                      By John Masefield
I must go down to the seas again, to the lonely sea and the sky,
And all I ask is a tall ship and a star to steer her by;
And the wheel’s kick and the wind’s song and the white sail’s shaking,
And a grey mist on the sea’s face, and a grey dawn breaking.
I must go down to the seas again, for the call of the running tide
Is a wild call and a clear call that may not be denied;
And all I ask is a windy day with the white clouds flying,
And the flung spray and the blown spume, and the sea-gulls crying.
I must go down to the seas again, to the vagrant gypsy life,
To the gull’s way and the whale’s way where the wind’s like a whetted knife;
And all I ask is a merry yarn from a laughing fellow-rover,
And quiet sleep and a sweet dream when the long trick’s over.

Get in touch


Nøsteveien 93c
N-3402 Lier


Contact Us

Phone : + 47 45602140

Email : nils@undervannsarbeid.no

Our Hours

MON-FRI 09:00 – 19:00