Re: Colorado Flooding - Need Floor Advice Please!
Since you say it's only half of the room, is it safe to assume it's the half closest to what used to be the roll-up door of the garage? Garage floors have a pretty good slope to them for drainage (rain/snow melt from cars has to go somewhere, doesn't it? ) and you description is in line with this.
There is probably little to nothing that you can do to keep water out, without some fairly substantial remodeling, which would include installing a curb foundation along the wall that used to be the roll-up door and possibly an cement overlay of the existing floor that will both level it out and raise it up a few inches, giving you more flood protection. There are sealants you can try (elastomeric or beutyl based ) but honestly, they don't tend to stick to dirty surfaces too well, so leakage will always be a problem.
Tile will probably be able to survive periodic moisture/flooding issues, I'm not a tile guy, so I can't really offer advice there.
I suffer from CDO ... Its like OCD, but in alphabetical order, LIKE IT SHOULD BE!!!