New flood level building guidelines
By David Hill, local democracy reporter
The risk of flooding in the Waimakariri district has caused a rethink of building guidelines.
The Waimakariri District Council has endorsed new flood mapping freeboard and floor level guidelines for very low, low and medium risk areas as it plans ahead for future flood events.
The new guidelines recommended floor levels of 300mm to 500mm above the flood level.
But staff were recommending no building in areas considered to be high risk flood hazard areas.
‘‘It is really important that our district continues to be built in a way that provides minimal risk to people and property,’’ mayor Dan Gordon said.
‘‘There has been a significant amount of work undertaken to ensure any risk of flooding has been mitigated the best it can be and that the process is as streamlined and cost effective as possible to developers.’’
In a report to April’s council meeting, utilities and roading general manager Gerard Cleary said the freeboard level was the height above the designated flood level.
In the Waimakariri district, the previous standard was a freeboard level of 300mm.
‘‘If the flood level is one metre above the ground at a house site and a 300mm freeboard level is applied, then the building’s floor level would need to be 1.3 metres above the ground,’’ he said.
Guidelines varied throughout New Zealand, but the freeboard allowance was generally between 300mm and 500mm.
In Christchurch the freeboard allowance was 400mm.
Cleary said the Waimakariri district was located in a large and predominantly flat floodplain, which meant a 300mm freeboard allowance was sufficient in a number of areas.
But there were several factors supporting the raising of the freeboard allowance to 500mm.
These included vehicle wash, survey error and inaccuracy, fences impeding flow, less public and insurance industry acceptance of flooding, modelling error and uncertainty, minor earthworks, ongoing movement due to seismic activity, climate change and catchment
changes.
National guidelines for new greenfield developments recommended a 500mm freeboard allowance above the flood level, Cleary said.
‘‘Where the land has a low risk of flooding, there is little or nothing that needs to be done by the developer to achieve the freeboard requirement.
‘‘In areas of medium or higher risk there may need to be additional filling or careful design considerations given to achieve the desired level protection.’’
Cleary said the guidelines took into account variation 1 to the Waimakariri District Plan, required by the Resource Management (Enabling Housing Supply and Other Matters) Amendment Act 2021.
Variation 1 identified areas of Kaiapoi as unsuitable for further housing intensification due to flooding risk.
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Hero
“I was born and raised in war. To be honest, those are not good memories.
I really like Iran, and I really miss it, but I couldn’t be myself there. Even though my family didn’t like my decision, I left Iran. I promised myself that I would do whatever I can for all communities, especially for the kids, so they do not have the same experience I had.
I studied software engineering in Iran and left in 2006. I went to Malaysia and stayed in Kuala Lumpur for seven years. I was admitted to Lincoln University to do my PhD here, but unfortunately, I couldn’t afford the expenses. I requested a scholarship, but they told me I had to be there for six months first. So, I stayed in Malaysia and did my PhD in network security. In December 2013, I came to New Zealand with a work visa.
It took me a while to connect with the Iranian community here. I volunteered with the Multicultural Council, SPCA, and community patrol, and I established the Christchurch Iranian Society in 2017. Before that, I started working on Radio Toranj, the only Farsi-language radio show in New Zealand.
One of the reasons I started organizing cultural events was to showcase Iranian culture. I wanted to show people that we have delicious food, colorful dresses, traditional customs, and our own instruments. My hope was to show people that we are not what you see in the media.
I am working to involve all the communities that celebrate Nowruz, the Persian New Year, in the Nowruz festival in March 2025. We want to share this celebration not only with our community but with the public as well. It’s better when it’s shared.
I remember the first time someone from Dunedin called me and asked, Hero, can you help? Something happened, and they keep declining Iranian visa applications. When I heard that, I felt insulted. We are still human, so how can they do that?
Through this journey, I’ve learned a lot. Every single day, people with different cases call me, and I try to share my knowledge and guide them as much as I can.
I have received several awards, including the Christchurch Civic Award and an Award of Recognition for my contributions to the community during the pandemic. In 2021, I established Canterbury Kia Ora Academy, a charitable trust. Through this charity, I can help other communities as well, not just the Iranian community.”
- Hero
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