Seqwater is actively engaged in the Lake Macdonald Dam Improvement Project, a crucial endeavor to enhance the safety and efficiency of the dam. The initiative is part of a broader commitment to modernize dams across Queensland and Australia to meet contemporary engineering standards. By upgrading the dam’s infrastructure, including the construction of a temporary cofferdam and a new spillway, Seqwater aims to bolster water supply reliability and fortify the dam against extreme weather conditions.
John Holland, a major construction contractor, is partnering with Seqwater on this significant project, which commenced with early site establishment in November 2024. The main construction activities are now in progress and are anticipated to span approximately five years, subject to weather and site conditions. As part of the project, a temporary upstream cofferdam is being built concurrently with the ongoing lake lowering process.
The cofferdam serves a vital role in providing a secure work environment for the demolition of the existing dam wall while minimizing disruptions to aquatic life and allowing certain recreational activities to continue. Adhering to industry standards set by the Dam Safety Regulator, the cofferdam’s construction and subsequent removal are integral parts of the overall project timeline.
The design of the new dam wall at Lake Macdonald incorporates a split-level concrete spillway, featuring both a primary ‘lower ogee’ spillway and an upper labyrinth spillway to manage varying flood conditions efficiently. Additionally, the reconstruction of earth embankments and the installation of scour protection measures are set to enhance the dam’s long-term functionality.
As part of the Lake Macdonald Dam Improvement Project, various activities such as fish relocation, cofferdam construction, and spillway demolition are underway. These operations are meticulously planned and executed within approved working hours to mitigate disruptions to the local community. Seqwater is dedicated to ensuring minimal environmental impact and maintaining open communication with stakeholders throughout the project.
Community engagement is a key aspect of the project, with Seqwater actively involving local residents through the Community Reference Group (CRG). This platform serves as a conduit for community input, addressing concerns, disseminating project information, and fostering transparency throughout the region.
Throughout the construction phase, Seqwater is implementing stringent environmental management measures to protect flora and fauna in the project area. Ecological surveys and relocation programs, including the recent successful relocation of native fish species, demonstrate Seqwater’s commitment to preserving local biodiversity.
Despite the construction activities, Seqwater ensures that recreational areas around Lake Macdonald remain accessible, with certain temporary closures in place for safety reasons. Seqwater expresses gratitude to the community for their ongoing support and patience during this essential dam upgrade, emphasizing the importance of these works for long-term water security in the Sunshine Coast region.
As Seqwater continues to progress with the Lake Macdonald Dam Improvement Project, regular updates and communication channels are maintained to keep residents informed about the project’s milestones and developments. The project is a testament to Seqwater’s dedication to enhancing dam safety and water security across South East Queensland, ensuring a sustainable water supply for years to come.
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