Flyover of a river with trees in the distance.
It's not about staying out of the floodplain,
Flyover of the Logan River.
It's just about understanding what risk we might face.
Megan Gould speaking to camera
Megan Gould. Program Leader, River and Catchment Engineering
Flood mapping is the tool that we use to understand where we might have a flood risk for our community.
Flyover of industrial area in Logan
With the amount of growth that we're expecting in Logan,
Fly over of the red bridge and the M1 highway
It's really important that we plan carefully,
and one of the key things that we have to consider is natural hazards.
Two people in high-vis uniforms walk across the road and look out to a body of water and its surrounding area.
The traditional style of flood mapping only considered the chance of a flood event, and so typically we used
that 1% flood, or it was previously known as the one-in-100 flood. Now we consider both the chance of flooding and how dangerous and hazardous it is.
Flyover of flooded areas of Logan
So when we build our computer models, what we do is we actually simulate historic events. So we take the actual rainfall that fell, apply it to our model,
Two people in high-vis uniforms measure a flood level meter and record it in their modelling device.
and then compare it to the water levels that were observed at our gauges. We then go out and do field observations just to check that the model is replicating real-world conditions.
Dominic Morris. Flood Plain and Project Officer. River and Catchment Engineering.
Dominic Morris speaking to camera.
Our telemetry network is a network of river and rainfall monitoring equipment
Dominic Morris in a high-vide uniform, climbs up a ladder to an elevated platform with an electrical box. The elevated platform looks over a natural landscape.
and we can use that then to get a real-time information of what's actually happening across the city.
We can use that data then to feed into our models and then they'll give us what the predicted flood levels may be.
Flyover of the elevated platform and Logan’s natural landscape.
So the new flood mapping has identified that about 30% of us
Family walking through Berrinba Wetlands.
interact with the floodplain in some way. The State Planning Policy requires that we look at the whole floodplain
and consider the areas of flood risk within that floodplain. And it also requires that we look ahead in time.
Two workers look at a printout of the flood maps, before looking up and pointing out into the distance.
So we have to factor in climate change, and that's because we know that the risk is increasing.
And so we want to make sure we plan our communities to be safe in the future as well.
Flyover of flooded areas of Logan.
Floodplains are an important part of our ecosystem, and by mapping and understanding where our floodplains are, we can allow them to do what they're meant to do.
Flyover of a natural landscape in Logan. The screen fades to white and the City of Logan logo appears.