Syphon Carrying Hatfield Waste Drain Below North Level Engine Drain Approximately 580 Metres East Of A18-A161 Road Junction

The syphon carrying the Hatfield Waste Drain below the North Level Engine Drain is located approximately 580 metres east of the A18-A161 road junction. It was likely constructed between 1795 and 1813, with revetment walls added later in the 19th century. The structure features tooled ashlar facing and a parapet, along with brick and ashlar tunnels and revetment walls. It measures approximately 22 metres in length from north to south. Both the north and south sides have three segmental-headed tunnel entrances, which are flanked by rusticated voussoirs and pointed cutwaters. Above, there is a band and a coped parapet that supports 20th-century railings. The tunnels slope sharply down below the waterline, and there are adjoining stone-coped revetment walls on either side of the lower drain. The Hatfield Waste Drain, which is the southern of the Double Rivers, passes underneath the North Level Engine Drain due to an obstruction from the River Torne. Although drainage work in this area was initiated by Cornelius Vermuyden in the mid-17th century, no structures from that time are visible. It is believed that the syphon was part of improvements made in the late 18th to early 19th centuries, possibly by Samuel Foster around 1795 or by Thackray around 1813, following proposals by John Rennie. The syphon is similar to a smaller one located at Sandtoft in Belton parish.