Talk to your midwife - I was a bit concerned my labour would be fast ( my first labours were 24 and 5 hours) and I'd end up with an accidental homebirth. It *was* fast, but I went to the hospital when my waters broke at 6cm and had a whole long, relaxing 20 minutes after I got the initial poking and prodding to have the baby on the hospital floor in

The midwife gave quite a few tips on what to do, a lot were hospital specific. Our hospital could send out an ambulance with a midwife in it to help, you might have a midwife that lives on your side of the flood road who you could call in an emergency. Although if the whole thing is fast they'd be more likely to check things out afterwards, I got told that the fast ones (which you're likely to have if your sig says 3 kids before) are usually just fine ...