Illiondale sinkhole repair delayed by discovery of hidden underground pipes
Unexpected underground infrastructure has delayed the Illiondale sinkhole repairs, pushing the completion date to late August as engineers revise designs to safely reroute stormwater flow into the wetland.
The repairs to the Illiondale sinkhole have been slightly delayed following the discovery of unmapped underground infrastructure.
After a site meeting on July 17, Ward 18 Clr Heather Hart explained that as workers excavated the area, several pipes not reflected on the service drawings were discovered.
“The purpose of the additional pipes needs to be determined,” said Hart.
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“With every new pipe found, the project is delayed because the design has to be revised.”
Hart said that while the design might change, the current plan involves constructing two junction boxes and three cabinets to accommodate the flow of water from the various pipes feeding into the main channel, before it flows into the Illiondale Wetland.
Repairs on the site began on June 10.
The sinkhole, which formed over two years ago, resulted in the full closure of Hubert Mathew Road.
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Concrete barriers were erected across the road to ensure motorists’ safety and to protect what remained of the damaged intersection.
City spokesperson Zweli Dlamini previously explained that the road was closed to prevent members of the public from entering the dangerous area and to halt the potential expansion of the sinkhole.
The site has long been an eyesore and safety concern for residents and Hart.
The collapse was initially believed to be caused by a failed stormwater junction box beneath the road. After inspections in 2024, the city confirmed that the subsurface structure had indeed failed.
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According to Dlamini, the failure may have been the result of various factors, including ageing infrastructure, soil movement, corrosion, rainfall, poor installation, tree roots, or nearby construction.
“It appears that the walls of the stormwater junction box, as well as its cover slab, had either collapsed or partially collapsed, which led to the subsidence,” Hart previously said.
While initial estimates projected the repairs to be completed by the end of July, Hart now believes a more realistic deadline is the end of August.
She added that, for now, there is no indication that Laurie Road will need to be closed.
“We are trying by all means not to close the road, but the situation may change,” said Hart.
