Tranby Foreshore Erosion History
The riverbank at Tranby Foreshore was once considered to be one of the most severely eroded riverbanks on the Swan River. As a result, the last remaining row of trees was falling into the river. Areas of the pathway alongside the bank were in danger of falling in and tall fences had to be installed where the safety to the public was high. The site was environmentally and aesthetically declining.
The erosion along the riverbank was caused by;
• overland water flow;
• steep banks;
• uncontrolled pedestrian access;
• lack of riverside vegetation and debris;
• wave action; and
• Collapse of the old wooden retaining wall. How we are restoring the riverbank at Tranby Foreshore
The City is now pleased to announce that the worst of the eroded areas along Tranby Foreshore has now been fixed using a combination of techniques.
Where the riverbank was being undercut or eroded at the toe, rip rap (a rock restoration technique) was installed to secure the bank from river erosion and allowed the City to batter (re-stabilise) and revegetate the riverbank. (See Attachment Tranby Foreshore Hard Engineering)
Where the riverbank was eroding along the bank, but not being undercut, the City battered the embankment and relegated it. Along the toe of the bank, jute logs were used to stablise the embankment long enough for sedges and rushes to grow. (See Attachment Tranby Foreshore Soft Engineering) What is planned for the future?
The City of Bayswater is very excited and proud of how successful this technique of river restoration has been. As can be seen when looking at the pictures below.
1. Attachment 1 Tranby Foreshore before erosion control works
2. Attachment 2 Tranby Foreshore during erosion control works
3. Attachment 3 Tranby Foreshore post erosion control works
4. Attachment 4 Tranby Foreshore post erosion control works
As we look forward to other erosion control works on the river in 2010/2011 (dependant on successful funding) the City plans to:
1. Undertake a detailed design and construct to replace the degrading asbestos wall at Bath Street Jetty with rock gabion walling.
2. Restore Section 3b (see attachment) of the Tranby Foreshore.
3. Restore Hardey Road Foreshore with soft engineering techniques.