Sediment Removed from Wairarapa Stream in Christchurch

North Canterbury Fish & Game staff recently spent two weeks co-ordinating the removal of sediment from the Wairarapa Stream in western Christchurch, according to the Fish & Game New Zealand latest announcement.

During this cleanup scheme, sixty-five tonnes of accumulated silt was blasted out of the Christchurch stream, one of the Avon River’s most important tributaries.

The operation removed silt which had accumulated over the years from storm-water drains flowing into the once-pristine stream.

The goal was to make the stream suitable for trout to spawn in, and habitable by other aquatic life.

“Silt layers on top of the stream gravels had smothered the invertebrates that live in the stream bed, and by removing the sediment aquatic life has the chance to prosper again,” said Fish & Game Officer Emily Arthur-Moore.

In total, around 540 square meters of streambed near the Jellie Park Recreation and Sport Center in Ilam were cleaned. That equates to 120 kilograms of silt per square meter cleaned.

The project had planned to be carried out over a longer reach but the techniques took longer than expected.

“Various techniques were used during the two weeks, including water jet blasters, diggers and a specialized piece of equipment called a ‘sand wand’,” Ms Arthur-Moore added.

Support was given to the project by the Christchurch City Council, Environment Canterbury and Nelson-based dredging and water treatment consultants Southwater, who also provided various pumps, hoses, etc.

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3rd International Congress Hydraulic Engineering Structures and Dredging

Russia’s leading maritime industry Media Group PortNews ( holds a traditional annual Congress “Hydraulic Engineering Structures and Dredging” in Moscow. 

The two-day Congress includes the 7th International Forum of Dredging Companies and the 3rd Technical Conference “Modern Solutions for Hydraulic Engineering”.

Infrastructure development is among the real sources of Russia’s economy growth. Construction of port facilities and new hydraulic engineering structures on the country’s inland waterways constitute an essential part of all infrastructure projects. It is important to take into account the best international practices to implement these projects effectively.

The program of the Congress will be devoted to the latest technologies for dredging and hydraulic engineering works. Speakers and delegates will refer to real projects to discuss specifics features of dredging works, as well as dedicated fleet and equipment involved.

To learn more about event, please, contact the organizing committee:

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