Gorton Falls was built by the Victorians in 1876 to keep the increasingly polluted waters of the Gore Brook out of Debdale reservoir. Four aqueducts carry the culvert across the water with the rest hidden within the banks.
This is the drain that got me into draining. I found a dark filled entrance, heard the water and smelt the culvert smell. After heading back a bit more equipped I went in and got my first taste of an underground river.