Many people are aware of parts of the story of the Walshaw Dean Reservoir project, like the trestle bridge spanning the river at Blake Dean, and the fact that there was a navvy encampment near Heptonstall. A certain amount has been written about the subject already - Harry Armitage put together an excellent little pamphlet in 1980, and Peter Thomas wrote about it in his book Mill, Murder and Railway, but Corinne and Ann have delved deep into the Archives at Calderdale Library as well as those of the Hebden Bridge Local History Society to bring alive the background and the details of this fascinating story.