The River Dour is Dover's 4 mile long river starting with tributaries in the Alkham Valley, Temple Ewell/Lydden valley and many underground chalk streams. The name 'Dour' is a Celtic word meaning 'The Waters'. The Dour also gives it's name to Dover as the town and river name both mean 'The Waters' and 'Dover' was spelt 'Dour' and 'Douer' at various points.
The Interview below is with Tom Read from the Environment Agency at Dover's Community Safety Day in 2010 about Dover's 'River Dour'. Click play to listen:
The picture below shows Dover's Western Docks where the River Dour flows into the sea. It enters this area through a tunnel from the Townwall Street subway through to the Marina creating bubbles on the water surface of the Marina. This area where the fresh chalk stream water meets the salty water of the English Channel is called 'The Bubble's' because of this.