You can Search inside this book at Deluge (Wesleyan Early Classics of Science Fiction Series)
This is a Natural Apocalyptic story.
Sequal is Dawn by S. Fowler Wright (1929)
"'Deluge' is an archetypal disaster story in which a geographical upheaval causes the greater part of Britain to sink beneath he sea, turning the Chilterns into an archipelago of tiny islands. The hero plays a key role in helping to restore some semblance of social order out of the violent anarchy which follows. The book is a direct ancestor of the similarly structured novels which John Wyndham and John Christopher wrote in the 1950s. The story was continued in a sequel, 'Dawn' (1929 in the US; 1930 in the UK), but a projected third volume was never written. Because so many copies were printed, the US edition of 'Deluge', published by Cosmopolitan, is much more common than the relatively scarce Fowler Wright edition, while Cosmpolitan's edition of 'Dawn' is also easier to find than the later UK edition."
"Film rights to his novel 'Deluge' (1927), which he printed himself some seven years after writing it, were sold to Hollywood, and the US edition of the novel then became a bestseller."
"He is a collectible author both here and in the USA, and the recent rediscovery of the film version of 'Deluge' - which had been thought lost save for the often used special effects footage of the inundation of New York - may help to re-ignite interest in his work. (The film was screened in some USA cinemas in 1994, but has not yet been shown in the UK.)"