Understanding the new Auckland Flood Maps on Trade Me Property

This layer shows areas that could get flooded from things like overflowing rivers or streams during a big storm. The modelling for this is based on a storm that has a 1% chance of happening in any given year (a "1-in-100-year" event). It also takes into account how future development and climate change might affect these areas.

What it means for you: If a property is in a floodplain, it's at a higher risk of getting flooded during a major storm.

These are areas where water can collect and sit during heavy rain because of the natural shape of the land. Think of a dip in the ground that acts like a bowl, trapping water when the stormwater drains are overwhelmed.

What it means for you: If a property is in a flood prone area there’s a chance that water could pool, even if there isn't a stream nearby.

This layer shows the natural route water takes when it flows across the land during a major downpour. These are like temporary streams that form when the regular stormwater pipes can't handle all the rain.

What it means for you: If a property is on or near an overland flow path, it might be in the path of moving water during a storm, which could cause damage or block access.