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Environmental Outcomes Monitoring and Research Program

Floodplain connectivity and inundation

Connectivity from rivers to floodplains.

Connectivity from rivers to floodplains

Why monitor connectivity?

The connection between a river and the floodplains alongside it, is known as floodplain connectivity. This connection occurs when the water in a river rises over the bank and spills onto the surrounding landscape. These areas can also be inundated from excess rainfall runoff within the catchment.

The inundation of these areas is important to support healthy ecosystems. Connecting flows move nutrients and sediments and enable native fish and other organisms to disperse between habitats. The frequency, timing and duration of inundation events all impact the overall health of floodplain ecosystems.

Photograph captured by drone of a floodplain pool in the Namoi catchment.
Photograph captured by drone of Gulligal Lagoon in the Namoi floodplain.

We are using satellite imagery to map floodplain inundation in the Northern Murray Darling Basin, and where satellite imagery is not available due to issues such as cloud cover, we will use predictive modelling techniques. This work will help us to identify the effect of floodplain structures on flood pathways, validate environmental water requirements and link ecosystem health with inundation patterns.

Our projects include:

  • Mapping and modelling floodplain inundation
  • Validating overbank environmental water requirements
  • Identification and mapping of flood paths and floodplain connectivity
  • Assessing the impact of floodplain structures on flood paths