Input (grade 12): The Manchester Ship Canal was built in 1894, in some sections by canalisation of the Rivers Irwell and Mersey, running 58 k from Salford to Eastham Locks on the tidal Mersey.
Output (grade 10): The Manchester Ship Canal was created by the digging of canals in the rivers Irwell and Mersey for 36 m from Salford to the Mersey estuary.