Build around 1790 this tunnel was built underneath the Castlefield Basin to deal with the excess waters of the River Medlock not used to supply water to the Bridgewater Canal.
A short water slide greeted us almost straight away and hinted this was going to be good. The box section soon opened up into a beast of a 12 ft RCP, Before long a large shaft rose above the pipe.
An overflow on the D Interceptor to the River Medlock, it's penstock was brand new technology at the time which helped keep river water out of the sewers.
Sidedraft is one of the culverts of the Gore Brook, its mostly brick with some concrete thrown in for good measure.
Supercharger takes the Gore Brook through a mainly brick culvert just under a kilometre long.