A state-of-the-art drilling technique helped Thames Water install a vital new sewage pipe while protecting a centuries-old country path used by medieval monks.
Engineers had to think differently when fitting the new pipe at Selborne sewage treatment works in Hampshire, UK, which is close to the ruins of a priory and is surrounded by protected woodland and historic monuments.
Instead of digging trenches and laying the pipe, they used a wire-guided drilling system to tunnel 320 metres through a large limestone hillside. The operation needed absolute precision to ensure the drill emerged in the right place on the other side of the hill and was carried out to perfection as it popped out on target.
The new pipe can now be pulled through the hole without disturbing the land above, connecting the sewage works to a nearby pumping station.
Mark Tolley, Thames Water’s field operations specialist, said: “Protecting the environment while we carry out our vital work is at the centre of what we do and ensuring we could put this new pipe in place without disturbing the beautiful and historic woodland in Selborne was important to us.
“By using some creativity to find a different way of doing things, we’ve made sure Selborne residents can continue to enjoy the countryside on their doorstep safe in the knowledge their wastewater is being safely taken away to be treated.”
The village of Selborne is famous for its association with the eighteenth-century naturalist Gilbert White and the meandering path, still popular with walkers, was cut by White and his brother.
The so-called “monks walk” now spans seven miles around the settlement and other nearby villages.
Steve Green, director of the Gilbert White’s House museum, said: “It's great to see Thames Water has taken such care with this installation to ensure that residents and visitors to the museum and the surrounding area are able to continue to enjoy the remarkable landscape and wildlife of Selborne as Gilbert White did.”
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