Water injection dredging is a proven, efficient, and environmentally sensitive method for maintaining navigable waterways, berths, and access channels.
At Polaris Marine Group, we offer tailored dredging solutions that support ongoing port operations, minimise environmental disruption, and reduce downtime for marine infrastructure projects.
With over three decades of marine experience, we understand the challenges of maintaining depth and sediment control — and we’ve got the fleet, team, and track record to deliver effective water injection dredging across Australia’s east coast.
What Is Water Injection Dredging?
Water injection dredging uses low-pressure jets to fluidise sediment on the seabed, transforming it into a dense current that flows along natural gradients to deeper areas. Unlike traditional mechanical or cutter suction dredging, this technique doesn’t remove material from the marine environment — it simply relocates it to where it causes less obstruction.
This approach is ideal for maintenance dredging, particularly in ports, rivers, and coastal zones where continual sedimentation occurs but physical removal is not always necessary or cost-effective.
Key Advantages
Water injection dredging offers multiple benefits:
- Environmentally low impact – Minimal turbidity and no need for spoil relocation
- Cost-effective – Lower mobilisation and operating costs than traditional dredging
- Fast turnaround – Ideal for rapid draft restoration
- Flexible operations – Suitable for confined or sensitive marine environments
- Minimal surface disruption – Works well in active harbours or alongside marine traffic
Polaris Marine Group’s experienced crews and in-house fleet make us a leading provider of dredging services. We manage the entire process — from pre-dredge surveys to execution and final reporting.
Where It Works Best
Water injection dredging is commonly used in:
- Port and harbour maintenance
- Marina entrance and fairway clearance
- Berth pocket management
- River mouth stabilisation
- Channel deepening (under certain conditions)
In particular, it’s an ideal method for sediment that is loosely compacted and fine-grained — conditions commonly found across many of Australia’s tidal and estuarine environments.
Our Equipment and Approach
At Polaris Marine Group, we use specialised injection dredging equipment mounted on custom-built vessels, with adjustable arms to target specific seabed layers. Our operations are supported by hydrographic survey teams to monitor progress and ensure accurate, consistent results.
Unlike larger dredging campaigns that require disposal sites and extensive compliance oversight, water injection dredging is often quicker to deploy and more adaptable — making it perfect for time-sensitive or low-volume campaigns.
Trusted Marine Partners
Polaris Marine Group has delivered dredging projects for port authorities, councils, and private developers. Our strong safety systems, local knowledge, and integrated marine services make us a trusted contractor for projects that demand flexibility and reliability.
Get in Touch
If your site requires reliable, cost-effective sediment management, then contact us today.
We’ll assess the project, provide expert advice, and deliver a water injection dredging solution tailored to your needs.
