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The River Tib is a very minor watercourse passing through the centre of Manchester. It is entirely culverted.
Its source was 'Cowper Pit', Miles Platting, subsequently covered by the L&YR works. (There was another stream passing nearby, whose source was Keene's Well, near the Newton Heath Brewery, Monsall Lane, which went under the L&YR's water tank. It passed under the Rochdale Canal at Royle's Bridge, joining Shooter's Brook at Gagg's Field near Butler Street).
The River Tib joins the River Medlock at Knott Mill. The Tib passes under the Rochdale Canal near Lock 89, where there is an old trapdoor in which allows the canal to be drained into the Tib. See YouTube video here