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Flood Protection

http://www.gw.govt.nz/floodprotection

Flood Protection


Greater Wellington works with communities to manage flood risk from the region's rivers and streams. We develop floodplain management plans, provide a free advice and consultation service in relation to flood and erosion risks, maintain and build flood protection works, work with the community to maintain or improve the environment and recreational opportunities and provide management and advice to Civil Defence during large floods.

Current projects 

Click on the links below to go to more information


 Ongoing River Maintenance and Management Operations

Greater Wellington Regional Council manages and maintains flood protection assets along 800km of river across the region. These assets are valued at $263million, and include 290km of stopbanks and 554,000 tonnes of rock. We also manage 155km of drainage channels which support farming or allow established land-uses to continue, and the single most expensive asset owned is the Lake Wairarapa Barrage gate, which is valued at $18million, its purpose is to manage the water levels within lake Wairarapa.

The maintenance of these assets is carried out all year round by our own skilled Operation and Maintenance teams based in the Hutt Valley, Wairarapa Valley and on the Kapiti Coast. 

Key contacts;

Hutt Valley and Kapiti Coast - Jeff Evans - info@gw.govt.nz

Wairarapa Valley - Mike Longworth - info@gw.govt.nz

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 Regional Resource Consents Renewal Project

This project has been split into Eastern (the Wairarapa) and Western (Hutt Valley, Wainuiomata, Kapiti Coast and Wellington) applications.

Greater Wellington Regional Council holds a large number of consents to allow for management of flood risk in parts of all rivers across the region. These consents expire in 2015, and it is essential that these consents are renewed to allow flood risk management to continue. The consent renewal process looks at the activities that are or can be carried out and assesses how these may impact on the environment, and what mitigation or controls are put in place to reduce or prevent these negative effects.

The consent application for the Western consents was lodged in October 2014. The Eastern consent application will be lodged in early 2015.

The consent renewal project is closely linked to the Flood Protection Code of Practice project.

Key contact - Tracy Berghan - info@gw.govt.nz

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 Environmental Code of Practice Development Project

This project will develop a code of practice to guide and monitor how all flood protection and erosion control activities are done across the region. 

The project has collected and reviewed all practices that have been carried out by the department over the last 15 years, and is formalising an adaptive management process to use into the future. This adaptive management process will allow continual improvement in techniques in response to the values and views of the community, while ensuring that outcomes are achieved to a consistant standard.

The code contains two parts the Code of Practice for flood protection and erosion control works, and the environmental monitoring plan to measure and record the impacts of works carried out under the Code.

The Code is closely linked to the Renewal of Resrouce Consents project

Key contact - Jacky Cox - info@gw.govt.nz

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 Pinehaven Stream Floodplain Management Plan

The proposed Pinehaven Stream Floodplain Management Plan was released for community consulation in October 2016. At the same time a challenge was raised against the flood model developed between 2009 and 2012. As a result of this challenge the decision to implement the plan has been deferred and an independant audit of the flood model, hydrology and application of freeboard has been instrcuted by the Hutt Valley Flood Management Subcommittee. 

This audit is anticipated to commence in March 2015, and be complete by May 2015. The findings of this audit will be reviewed and adjustments made to the proposed floodplain management plan will be made if required. 

Implementation of any floodplain management plan physical works will be deferred until October 2016.

Key contact - Alistair Allan - info@gw.govt.nz

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 Hutt River Floodplain Management Plan - Hutt City Centre Project

The Hutt River Floodplain Management Plan was adopted by the Hutt Valley Flood Management Sucbommittee in 2001. This project detailed an extensive programme of flood protection works to upgrade the flood security for the communities within the Hutt Valley.

The Hutt City Centre stopbank upgrade project is the next programmed part of this floodplain management plan and is will improve the flood security in the vicinity of the central business area of Hutt City.

Key contact - Daya Atapattu - info@gw.govt.nz

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 Jim Cooke Park Stopbank Realignment

The Jim Cooke Park stopbank on the banks of the Waiakane River will be constructed between 236 Te Moana Road and 75 Nimmo Avenue East to better protect the community from major flooding.

We've worked with the community to build understanding of what we are trying to achieve and to hear its views on issues of importance to them. So far we've distributed newsletters, held a public open day, publicised our proposals via the news media, spoken directly to people affected by our proposals and invited people to make comment on them via the Greater Wellington Regional Council website.  

While the formal consultation period has expired, we would still like to hear your views on what we propose to do.

Key contacts

Kees Nauta - info@gw.govt.nz

Anna Carter - info@gw.govt.nz

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 Waiohine River Floodplain Management Plan

The Waiohine Floodplain Management Plan (FMP) is in the final stages of identifying a stopbank option to protect the community of Greytown from the effects of flooding.

The FMP has progressed to the point where there is a proposed option which is being incorporated into a draft FMP. This draft FMP will be taken to the community in early to mid-2015 for their comment and review.

Following consultation any changes will be included in the final FMP document.

Once the Final FMP document has been endorsed by the councils involved construction can proceed.

Key contact - James Flanagan - info@gw.govt.nz

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 Te Kauru Upper Ruamahanga Floodplain Management Plan

This project will develop a floodplain management plan for catchment of the Ruamahanga River above its confluence with the Waiohine River. It includes the catchments of the Ruamahanga River, Waingawa River, Waipoua River, Kopuaranga River, Whangaehu River, and Tauweru (Taueru) River.

The project completed its first phase of investigations in October 2014. This identified and recorded flood and erosion hazards and values with the rivers and floodplain, and reported on the potential for damages to these values in the event of large damaging floods.

The project is moving into the second phase of investigation, and the project team and subcommittee have started to look at tools that can be used to manage flood risk. 

If you want to be involved in the project or have questions about your flood risk please get in touch.

Key contact - Alistair Allan info@gw.govt.nz

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 Waiwhetu Stream Floodplain Management Plan

The Waiwhetu project completed in 2009 improved the flood security for property in the catchment to a 1-in-40 year return period flood level of protection. This work has prevented a repeat of the 2004 floods which affected many members of the community.

Since completion of that part of the project we have been looking at supplementary ways to manage the flood risk to improve the resilence or protection levels for the community. Investigations have not yet identified any cost effective method of increasing protection levels, and as a result the subcommittee accepted a recommendation to put the project on hold until June 2015.

Future work will look at alternate methods of flood risk management, including consideration of managed retreat, staged protection works and flood reslience improvements.

Key contact - Alistair Allan - info@gw.govt.nz

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