A residential development was proposed at the headwaters of Bundamba Creek in Brisbane. The waterway at the site was identified as a 'chain of ponds' system featuring a discontinuous channel within a broad floodplain. Due to historical disturbances from track roads and dispersive soils, the system was transitioning to an incised channel system. The need for restoration was recognized, but limited understanding of the current geomorphic processes, its evolutionary stage and potential impacts from the proposed development hindered the implementation of effective rehabilitation measures.
To fulfil the knowledge gap, we conducted a geomorphic assessment involving geomorphic characterisation, hydraulic interpretation, and a field investigation. Additionally, a soil assessment was undertaken to determine the soil condition and associated risks. Based on the findings, rehabilitation measures were proposed and implemented. Frequent monitoring inspections were undertaken to ensure the effectiveness of the rehabilitation measures.
Managing this creek system presented various challenges, notably its distinct behavioural regime and the highly erosive soil conditions. Understanding this uniqueness was crucial in developing tailored, effective management measures.
Headwater streams all around the world are under threat due to rapid urbanization. These streams play a vital role as the most upstream sections of the river networks and cover a significant proportion of the catchment. Therefore, protecting headwater streams is crucial in improving the resilience of catchments, especially under changing climatic conditions. However, managing these systems present numerous challenges. Insights gained from this project can inform effective management strategies for similar intricate systems.