Following the February 2022 flooding disaster, the community of Tweed and surrounding villages were severely impacted, and Tweed’s Road network experienced landslides, damage to bridges, and hundreds of roads were in need of repairs.
CMC were engaged by Tweed Shire Council to undertake the Design and Construction restoration of four major landslips along the Tweed River at sites Kyogle Road A, B & C and Mount Warning Road. At the Kyogle Road sites A and B, approximately 3 meters of flood waters covered the road. At all four sites along the Tweed River, flood waters eroded the riverbanks and washed away all the land adjacent to the road.
Complex Geotechnical Solutions: Restoration involved addressing landslips with varying geological conditions. Geotechnical drilling and geomorphology assessments allowed for optimised design, reducing costs and river impact. Gabion Baskets and rock mattresses were methods used to stabilise the riverbanks.
Sustainable Impact: CMC developed detailed Environmental Management Plans to manage key environmental risks due to proximity to the Tweed River. Collaboration with the Department of Fisheries and the river and coastal team ensured quick permit approvals and minimized environmental impact.
Collaboration: CMC has a strong relationship with experienced design partners BG&E and the geotechnical team at FSG. Operating under a GC21 Collaborative D&C contract, we hosted regular Focus Group Meetings involving the client and other key stakeholders in a collaborative approach.
Community Engagement: Aware of the impact on the community, CMC aimed to reopen the roads as soon as possible. We maintained two-way traffic flow throughout the duration of the project to minimise disruptions and delays to the local residents. CMC and BG&E engaged with the Traditional Owners during the 30% design phase and throughout the project, incorporating their input to minimise environmental impact. A Welcome to Country Smoking Ceremony and cultural awareness workshops have fostered respect and collaboration.
By integrating collaborative, environmental, and community-focused strategies, CMC addressed landslips challenges and enhanced the long-term resilience of the Tweed Shire community.
