In his resignation letter, Sir Philip said media attention resulting from his holiday in Barbados had ‘diverted attention from the real issue of helping those whose homes and businesses have flooded’.
The EA chairman faced a backlash when he continued to holiday in the Caribbean despite major flooding which wreaked havoc in parts of Lancashire, Cumbria and Yorkshire.
The letter said: "My reason for resigning is that the expectations of the role have expanded to require the chairman to be available at short notice throughout the year, irrespective of routine arrangements for deputy and executive cover.
"In my view this is inappropriate in a part-time non-executive position, and this is something I am unable to deliver.
"Furthermore the media scrutiny focused on me is diverting attention from the real issue of helping those whose homes and businesses have flooded, as well as the important matter of delivering a long-term flood defence strategy.
"This same media attention has also affected and intruded on my immediate family, which I find unacceptable.”
Sir Philip also responded to claims he had mislead the public after the EA told the media he was ‘at home with his family, who are from Barbados’, when it later emerged his wife, June Dilley, was from Jamaica.
He added: "I want to be clear that I have not made any untrue or misleading statements, apart from approving the statement about my location over Christmas that in hindsight could have been clearer."