KNYSNA NEWS - Hospital Hill Road in Knysna is currently partially closed after a retaining wall failed and the adjoining road surface cracked and partially collapsed following heavy rainfall and a severe storm last month.
The affected section has been deemed unsafe, with traffic restrictions and diversions implemented while investigations and repair planning continue.
The damage has raised growing concern among residents, particularly as the incident occurred adjacent to an active private development site where excavation work has been ongoing.
Multiple contributing factors under review
Concerned residents say several factors may have contributed to the failure. These include prolonged heavy rainfall, saturated soil, and the continuous movement of construction machinery such as tractors and excavation equipment in the area.
Additional concern has been raised about possible disruption to the surrounding ground due to excavation works, which may have weakened slope stability and the structural integrity of the retaining wall.
Reports have also highlighted the presence of displaced people occupying parts of the surrounding area, adding further pressure and disturbance in an already sensitive zone.
Stormwater concerns and possible blockages
Residents have long raised concerns about stormwater management in the area, alleging that a key culvert carrying runoff from the upper Paradise catchment may have been blocked or inadequately maintained.
They believe that uncontrolled stormwater flow during heavy rainfall may have increased pressure on the retaining structures and contributed to erosion beneath the road surface, worsening instability of the soil.
Municipality investigates cause and responsibility
Knysna Municipality has confirmed that its Infrastructure Services Department is investigating the matter. “Officials have engaged with the developer and engineering teams, with further site inspections and technical assessments scheduled in the coming days,” said Christopher Bezuidenhout, municipal communications manager.
“Precautionary measures remain in place, including partial road closures, traffic diversions, and temporary stormwater management interventions to reduce further risk to the public.”
Bezuidenhout said that remedial work began on site on Monday 8 June. Contractors began clearing debris and vegetation from the embankment and made preparations to stabilise it. They also executed preliminary earthworks and made site access improvements to facilitate detailed engineering inspections and the implementation of temporary support structures where needed.
In a further development, the Building Control Department has issued a formal notice to the property owner in terms of Section 12 of the National Building Regulations and Building Standards Act.
The notice requires the owner to investigate the condition of the affected earthworks and structures, appoint a suitably qualified registered professional at their own cost, and submit a report with recommendations on remedial measures necessary to ensure public safety.
According to the municipality, the property owner has acknowledged receipt of the notice and indicated that the required actions are being undertaken as a matter of urgency. The department will continue to monitor progress and ensure compliance with the requirements of the notice.
Meanwhile, Ward 10 Councillor Peter Bester confirmed that, on Monday, municipal Roads Department teams carried out temporary repairs along the alternative route being used while Hospital Hill Road remains partially closed.
He described the work as a welcome first step but said concerns remain regarding increased traffic volumes, school transport, speeding vehicles, blind spots and narrow sections along Short Street and Agnar Street, that are now carrying additional traffic.
Liability and repair costs still undetermined
At this stage, authorities are proceeding cautiously in determining liability for the damage and future repair costs. With the above possible contributing factors, responsibility has not yet been assigned.
Engineering and environmental assessments are expected to determine whether the failure was primarily due to municipal infrastructure maintenance issues, development-related impacts, or a combination of both. Residents are urged to avoid the affected area until further notice.
The stormwater culvert after the recent heavy rainfall. Photo: Rozano Alie
The stormwater culvert prior to development and the recent severe rainfall. Photo: Supplied
Hospital Hill Road remains closed until further notice from authorities. Photo: Rozano Alie
Extensive erosion and road failure can be seen along the hillside above the development site. Photo: Rozano Alie
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