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Dunedin City Council – Kaunihera-a-rohe o Otepoti
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Questions and Answers

Will we still get flooding in heavy rain?

The new pump stations and the pipe upgrades will make a big difference, but you will probably still see surface flooding in particularly heavy rain.

How much rain will the new stormwater pump stations be able to cope with?

The current pump stations can discharge approximately 2200 litres of stormwater per second. When it rains heavily, these pump stations can’t drain all the stormwater to the river, so it backs up and causes flooding. Stormwater can also get into the wastewater pipes and then overflow onto the road.

The new stations will be able to discharge around three times more water and will be able to cope with heavy or prolonged rain. In extreme events, flooding is still likely.

Will the new pump stations be in the same place? How will this affect the current pump stations?

Yes. The new pump stations will be in the same location. We will keep the current pump stations operational while building the new ones.

How can I protect my property in heavy rain?

It’s a good idea to plan ahead if you are worried about flooding.

Heavy rain puts pressure on infrastructure and it is our job to make sure our roads, pipes, mudtanks, stormwater screens and treatment plants are working as well as possible. We do our best to keep water off your property and carry out extra checks and maintenance when heavy rain is forecast.

However, we can’t control the weather and everyone needs to be prepared for the possibility of flooding. Here are some things you can do to protect your property.

  • Check spoutings and drainage channels for blockages and clear them if necessary.
  • Keep your valuables, getaway kit, emergency clothing and food off the floor.
  • Check your insurance is up to date.
  • Consider purchasing sandbags.
  • Create a household emergency plan.
  • Check gutters and grates near your house are clear of leaves and other debris.
  • If your basement is prone to flooding, lift items that could be damaged by water off the floor. Be sure garden sprays and other chemicals won’t be affected.
  • If you feel concerned, make plans to stay with friends or family who live on higher ground should it be required later on.
  • Check on neighbours, particularly if they are vulnerable.
  • To keep up to date with what is happening and for advice about what to do if the rain gets worse, please see the DCC website, DCC social media, listen to the radio and use other media.
  • Call emergency services on 111 if you feel your safety is in danger or you have water entering your house or business.
  • Follow any instructions from Civil Defence and emergency services.

If you notice a mudtank that is not draining (the stormwater grates in the gutter), please call the DCC on 03 477 4000 so we can organise the contractors to visit the site and address the problem.

Why can’t the work be done quicker?

It takes time to plan, design and build good infrastructure. In this case, we also need to keep the old pump stations running while we build the replacements in the same place – this is more complicated than building in a new location.

How will the construction work affect me?

We are not expecting major disruption while the new stormwater pump stations at Reid Avenue and Carlyle Road are being built. However, you may notice more traffic at both locations. At times, we may need to restrict access to the track along the bank of the Silverstream to keep the public safe.

How much will the work cost?

We estimate the work will cost around $9 million dollars, which will come out of our current renewal budgets.

Where will the mobile pump units be used?

Staff and contractors will closely monitor problem areas so we can prioritise where to use the mobile pumps. This is likely to change from event to event.

I live outside the catchment and have been flooded – what should I do?

If you have been flooded in the past or are concerned about flooding, please have a look at the flood protection actions above.

We would also like to hear from you if your property is flooded so we can build our understanding of how flooding may affect different parts of the city and work with residents to reduce the risks.

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