Huntons were commissioned in 2018 to design, build and install a three stage trash screen at Clays Lake on the Stanford Brook, as part of a reservoir being built to protect Gatwick Airport. The three stage trash screen was fitted at the inlet to a culvert controlled by a powered penstock also designed and built by Huntons. The scheme incorporated a bypass penstock as well as stoplogs, handrailing, control system and culvert outlet steelwork.

Due to the nature of the site the actuators controlling the two penstocks had to be IP68 rated to a depth of 10m for 10 days, this made selection of suitable actuators and drive gear challenging but was delivered to specification. Additionally due to the remoteness of the site a 7 day UPS battery system was required that could operate the penstocks fully during this period.

The trash screen incorporated access equipment complaint with the latest Environment Agency specifications including davit points, extendable ladders and pneumatically operated hatches to ensure maintenance can be carried out safely.

The steelwork was designed in house and verified to Eurocode 3. All parts were manufactured in house at our purpose built facilities in Maidstone, Kent. All the steelwork was CE marked to Execution Class 2 to BS EN 1090.