Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search


Swales to be given eco trial

Swales to be given eco trial

North Shore City is introducing a new way of providing stormwater-friendly road edges and drive crossings in an urban environment. Called a "swale", it consists of a shallow mowable grassed ditch at the edges of the road, and piped vehicle crossings. Permeable paving can also be provided for roadside vehicle parking.

Joel Cayford, who chairs the council's works and environment committee, says the design helps prevent dirty stormwater from entering city waterways by using the vegetation in the shallow drain to help filter stormwater from the road. Councillor Cayford says local residents are being asked not to park on the soft grass within the swale, and preferably to keep the grass no shorter than 150mm to help it do its filtering and cleaning job.

North Shore City Council is currently rebuilding Roland Rd in Greenhithe at a cost of $700,000 to make use of this stormwater-friendly option. At this week's works and environment committee meeting, councillors approved a tender for the work to start, which is subsidised by a water quality improvement grant from Transfund. Joel Cayford says that while the Roland Rd swale is experimental in North Shore City, it is widely used in other parts of the world. The design can cost more than conventional kerb and channel to build, but saves downstream costs by reducing the amount of pollution that passes into city waterways.

"This one should serve as a good example for developers to adopt in future to provide a softer and greener road edge," Councillor Cayford says.

It is expected that the grassed swales will be built along the side of a road as an alternative to an unformed ditch or conventional kerb and channel.

North Shore City's stormwater operations manager, Roger Hawthorne, says the Roland Rd project is designed to reduce by 80 per cent the level of contaminants from roads reaching sensitive waterways and the Waitemata Harbour.

© Scoop Media

Parliament Headlines | Politics Headlines | Regional Headlines


Ruataniwha: DOC, Hawke's Bay Council Developer Take Supreme Court Appeal

The Department of Conservation and Hawke's Bay Regional Investment Company (HBRIC) are appealing to the Supreme Court over a conservation land swap which the Court of Appeal halted. More>>


With NZ's Marama Davidson: Women’s Flotilla Leaves Sicily – Heading For Gaza

Women representing 13 countries spanning five continents began their journey yesterday on Zaytouna-Oliva to the shores of Gaza, which has been under blockade since 2007. On board are a Nobel Peace Laureate, three parliamentarians, a decorated US diplomat, journalists, an Olympic athlete, and a physician. A list of the women with their background can be found here. More>>

Gordon Campbell: On The Key Style Of Crisis Management

At Monday’s post Cabinet press conference Key was in his finest wide- eyed “Problem? What problem?” mode. No, there wasn’t really a problem that top MPI officials had been at odds with each other over the meaning of the fisheries policy and how that policy should be pursued... More>>


Mt Roskill: Greens Will Not Stand In Likely Post-Goff By-Election

“The Green Party’s priority is changing the Government in 2017, and as part of that we’ve decided that we won’t stand a candidate in the probable Mt Roskill by-election... This decision shows the Memorandum of Understanding between Labour and the Green Party is working." More>>


Wellington: Predator Free Capital Plan

Wellington City Council (WCC), the Greater Wellington Regional Council (GWRC) and NEXT Foundation, today announced a joint collaboration to make Wellington the first Predator Free capital city in the world. More>>


Gordon Campbell: On Judith Collins’ Efforts At Self Correction

Thousands of prisoners currently in prison may be entitled to an earlier release than expected – and compensation – because Corrections has incorrectly calculated their term of imprisonment. Unless of course, the government buries its mistakes by changing the law and retro-actively getting itself off the hook… More>>


More Justice & Corrections

Sector Opposes Bill: Local Government Bill Timeframe Extended

The Minister of Local Government Peseta Sam Lotu-Iiga has asked the Select Committee to extend the report back date for the Local Government Act 2002 Amendment Bill (No 2). More>>


Get More From Scoop



Search Scoop  
Powered by Vodafone
NZ independent news