the river also supplies water to the canal via the Brancliffe feeder and the Kilton feeder. The natural water sources are supplemented by the outflows from Dinnington and Anston Sewage Treatment Works into the Anston Brook, which together provide about 7 Ml/d (megalitres per day), while Kilton Treatment Works supplies about 12.8 Ml/d. At Manton, excess flow from the canal tops up the river, and water pumped from Manton Colliery formerly performed the same function. With the closure of the mine, a new borehole was constructed in 2004, and water is pumped from the Sherwood Sandstone aquifer into the river. The borehole is operated by Severn Trent Water. In order to monitor flows on the river, the Environment Agency maintain gauging stations, one to the east of Worksop and a second to the east of Blyth at Craig y Nos. They also have one on Oldcotes dyke, just below Blyth Old Bridge. The catchment area above the Worksop gauging station is and the mean flow is 8.55 million gallons (38.88 Megalitres) per day. The catchment receives of rainfall in an average year. Oldcoates Dyke contributes 12.92 million gallons (58.75 Ml) per day, and the flow at the Blyth gauging station amounts to 28.89 million gallons (131.3 Ml) per day, derived from a catchment area of . This station has been operational since 1984. Previously, there was a gauging station a little further downstream at Serlby Park, but this was decommissioned in 1978, as the flow readings in the summer were not reliable. Data from the Blyth station is transmitted to the pumping station at West Stockwith, where it is used to control discharges from the River Idle into the River Trent. Normal river levels at Worksop vary between and , but when the weather is more extreme, can rise up to . The highest level recorded at the gauging station was on 26 June 2007, when it reached . At Blyth, the normal range is from to , rising to in severe weather. The highest level recorded was on the same day as the Worksop station, when the river level reached . Course The River Ryton starts to the east of Kiveton Park, next to the Chesterfield Canal, close to the contour. It is accompanied by the Sheffied to Lincoln Railway line which crosses it three times, before its flow is supplemented by Pudding Dyke, flowing northwards from Thorpe Salvin.