The 2-year civil engineering job will shield the steelworks and wider Decrease Don Valley from repeat flooding by intercepting Bagley Brook the place it enters the plant.
A significant underground system of attenuation tanks, switch tunnels and a brand new pumping station will seize and retailer stormwater earlier than releasing it into the River Don at a managed charge of 8,000 litres per second.
JBA Bentley will sink a 5-metre shaft to launch a tunnel boring machine that can drive a 320-metre tunnel, 12 metres under floor. The launch shaft will double because the pumping station and storage chamber.
Craig Fisher, programmes director at Sheffield Forgemasters, mentioned the system will “tackle a recognized flood threat which may have an effect on each our plant and this a part of the town.”
A bit of flood wall alongside the Don may even be rebuilt to deal with the brand new outfall construction.
The undertaking fulfils planning circumstances for Forgemasters’ £400m web site transformation, together with its new 13,000-tonne forging line now underneath development beside the Midland Mainline railway.
