Erosion control and flood resilience using vegetation

News-Archive

Three Mile Scrub – Quandong Bushcare Group has shared their experiences at Banks Street Reserve on erosion control and flood resilience using vegetation.

Before the group began rehabilitating the banks of Enoggera Creek, the dominant species at their site was weedy Cane Grass.

Removing the Cane Grass was a delicate operation because clearing the soft banks could have led to serious erosion. The group tackled the problem by using mosaic weeding small areas and replanting as quickly as possible. They also developed techniques for profiling and stabilising soft weedy banks which were already being undercut by erosion.

In November 2021, the group celebrated the removal of the last stand of Cane Grass at their bushcare site.

They make the following observations:

  • Stable creek and rivulet banks in our area have vegetation including trees close to the waterway edge.
  • A network of tree roots gives great bank stability.
  • Banks of lomandras and other grass like plants without protective trees ‘anchoring’ them tend to pull out in flood conditions.
  • A bank protected by weeds, such as Singapore Daisy and Cane Grass, is much more stable than a bank with no weeds.
  • Many species of riparian fauna require near continuous vegetation cover for protection.

Their paper Erosion control and flood resilience using vegetation – experiences of a bushcare group 2014 to 2022 includes a how-to guide and great tips. You can download the 7.5 Mb PDF.

Stabilised bank of Enoggera Creek at the Three Mile Scrub – Quandong Bushcare site.