Raised chambers housing flow gauges for London’s new multi-million pound ‘super sewer’ have been secured with intruder-resistant turret tops. Thames Water‘s extension to the Lee Tunnel was opened earlier this year by Boris Johnson before his term ended as London Mayor. The 4.3 mile-long, £678m project took four years to build and was designed to stop sewage flushing into the River Thames and River Lee.
The security and sports fencing company Zaun had already secured the access points to the tunnel extension with its most intruder-resistant product, ArmaWeave, installed by Zaun subsidiary Binns Fencing. The product makers say that ArmaWeave’s tight mesh pattern provides no climbing aids, limiting the potential for intrusion.
Zaun designed two bespoke ‘cages’ from ArmaWeave with special fixings and topped with 980 razor coil to protect the flow gauge chambers.
On average 39 million tonnes of untreated sewage mixed with rain water gets discharged into the River Thames from overloaded treatment works and combined sewer outfalls every year. The biggest of these outfalls, at Abbey Mills pumping station, has been discharging 16 million tonnes of sewage per year to the River Lee. The Lee Tunnel connects the Abbey Mills Water Treatment Centre to Beckton Sewage Treatment Works, Europe’s largest such site, both also secured by Zaun perimeter fencing.
