Shouldn't be a problem if they had any sense to build there server rooms on raised platforms which most datacenters do.
Anyway, American Web Hosts are really bad, they oversell like hell, are more unreliable in general than UK
web hosting companies.
I'm not denying the fact it may have taken then a short period of time to resolve the problem, but let me assure you that eukhost is current facing a really big problem which requires a lot more effort to fix.
Anyway, if there are in a flood/hurricane plane, they should take measures to avoid problems.