I always shut off the incoming water line after one 3-month trip in 2005. We came home to 4" water in our walk-in basement. The only reason it was not deeper was the basement drain system could keep up with the aid of 4" water weight helping flow rate.
It took a month to clean out soggy materials, dry out the basement, treat for mold/mildew and allow time to insure it worked. Then the rebuilding process began, which took me almost 4 months working after arriving home from my day job.
Oh, the leak cause, the water softener inlet valve blew a gasket, and was out of warranty. Luckily our home owners ins. paid their share after I proved it was not an excluded natural flood issue.
2000 Winnebago Ultimate Freedom USQ40JD,
ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA." My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy