People will be able to live at Billing Aquadrome Holiday Park all-year round.
Changes are planned for the holiday park that has flooded several times over the years.
Northamptonshire victims are remembered on the anniversary of the discovery of the Titanic wreck.
The decision follows its owners warning people of "a serious risk to life" at the site.
Police say the closure could remain in place "for some time".
Residents hit by flooding describe what it has been like in the aftermath of Storm Bert.
The holiday park in Northamptonshire says it is dredging the lakes and rivers.
The man in his 30s is receiving hospital treatment while police continue its inquiries.
It is the third time the site has been evacuated this year after flooding in January and February.
