EWB Challenge | 1.8 retaining walls

Challenges

This topic has 4 replies, 4 voices, and was last updated 1 year, 4 months ago by Jean Aquinde.

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28/03/2022 at 7:26 am #4283
Thomas Kiess
Participant
Hi,

Looking at the description for this design choice I wanted to confirm that they are looking for solutions for retaining walls specifically around Dungarra or should this solution be applicable for all parts of the Barron River?

Further to this is there any information where the undercutting of the river bank is most severe and would need more attention or a stronger structure to hold it or any data showing where is the least or most undercutting occurring?

Thanks,

Thomas.
29/03/2022 at 9:50 am #4289
Rachel Alford
Keymaster
Hi Thomas,

Great questions!

Yes, erosion control on Dungarra is of the most interest to Dawul Wuru as the erosion along the riverbank has been identified. You can use Dungarra as a context case study for your design, but if your design can be adaptable to other places along the Barron River, that is advantageous too.

After speaking with our contact at Dawul Wuru, they mentioned that there is no particular location where the erosion is more significantly more severe, however they are the most concerned about the erosion near the river banks closer to the mouth of the river, as there are nearby residential areas that have higher risk of potential damage. If you take a look at the Dungarra interactive, in the location named “River (bollards)” you can see that some of the trees have been uprooted due to the erosion there.

In terms of data, we don’t have any specifically available but we encourage you to research online and see if you can find any mapping or reports of erosion in the area. You can also assume that the erosion shown in the interactives at Dungarra is the more severe undercutting at the moment, and use what you can see in the interactives to base your design on. I would also encourage you to think longer term with your design too – if the erosion was to become more severe in the future, would your design still work, or are there adaptations that would need to be made to it?

I hope this helps, please reach out with any further questions!

Thanks,
Rachel
29/03/2022 at 7:26 pm #4293
Thomas Kiess
Participant
Thanks for the clarification, that really helps.

Thomas.
15/08/2023 at 10:03 pm #6688
Sarah Hassanin
Participant
Hi,

I hope you’re doing well. I wanted to reach out to you regarding the 1.8 opportunities program. As a participant, I am interested in understanding if the community of Dungarra has a list of asset requirements that we should consider. This information would help us tailor our design solution to better meet the needs of the Dungarra community.
Specifically, I would like know if

1-the design’s purpose is solely to prevent erosion of banks and reduce flooding, or if it aims to fully prevent flooding?

2-Is there a desire to reclaim the land lost from erosion?

2. Are there any specific materials that should be included in the construction of the structure?

3. What is the expected life asset of this project?

4. How many meters of the river bank require protection?

5.is it acceptable if our designed structure obstructs the view in order to prevent flooding?
21/08/2023 at 1:28 pm #6698
Jean Aquinde
Keymaster
Hi Sarah,

Thanks for your questions and for thinking about tailoring your design solutions for the community. Here are my answers for each:

1. In the brief, we mentioned that the proposed solution needs to address the rising sea levels and reduce the damage caused by the increased severity and frequency of storms, cyclones and floods. In a similar post, Dawul Wuru pointed out that they are most concerned about the erosion near the river banks closer to the mouth of the river. Please note that nearby residential areas will benefit from your proposed design of retaining walls, so I suggest you address the existing erosion problem and ensure the structure is designed to prevent flooding.

2. This might be a great solution from a sustainability point of view. However, weigh the cost-benefits of executing land reclamation. If you plan to propose this to your design, how do you envision achieving this at a low cost?

3. No specific materials are required to be included in the construction; however, I’d challenge you to look for natural materials or low-cost materials to source in the area to incorporate into the structure.

4. Take a closer look at the erosion photo in Dunggara in the Interactives to estimate the design height needed.

5. To get a better understanding, it’s essential to know what activities are allowed in that zone. Have a read on this resource – Great Barrier Reef Marine Parks Zoning MAP 5 – Cairns.

I hope this helps.

Regards,
Jean
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