GeotechnicalSafety CoalTipRemediation slopestability SlopeStabilityMeasures

Coal Tip Safety in South Wales: Engineering Solutions for the Future

*A closer look at Woodland Terrace in Cwmtillery looked after the coal tip landslide. Source: BBC*

In November 2024, Storm Bert wreaked havoc across South Wales, triggering a landslide at a legacy coal tip in Cwmtillery. The collapse led to the evacuation of 40 homes and extensive damage to local infrastructure as water and debris surged from the tip onto roads and properties. The incident underscored the dangers posed by disused coal tips, which are highly vulnerable to weathering and heavy rainfall.

Local authorities swiftly initiated emergency measures. Engineers traced the water flow causing the slope’s saturation and redirected it into an offsite drainage system. Simultaneously, reprofiling of the slip area was carried out, followed by the application of Geojute matting to stabilize the exposed slopes. By December, residents were allowed to return home, with the immediate risk deemed mitigated.

GeoJute Erosion Control Rolls. Source: FLP

Ensuring Long-Term Stability

While emergency measures resolved the immediate threat, Blaenau Gwent Borough Council is focused on ensuring the long-term stability of the site. Collaborating with the Welsh Government, plans are underway for detailed surveys, enhanced drainage systems, and continuous monitoring. External consultants have been engaged to assess the work’s effectiveness and bolster confidence in the site’s safety.

The council has committed to twice-daily monitoring during heavy rainfall and weekly inspections by the Mining Remediation Authority. These steps aim to prevent future disasters while setting a precedent for managing other high-risk coal tips across Wales.

Legislation for Safer Communities

The Welsh Government is advancing coal tip safety with the recently introduced "Disused Mine and Quarry Tips (Wales) Bill." Addressing the 2,573 disused coal tips across the country—350 of which are classified as high risk—the legislation aims to safeguard communities from the devastating effects of landslides and ensure sustainable management of these aging structures.

Sources: geplus.co.uk, bbc.com