here is a website with lots of info in English

http://www.thaitravelblogs.com/2011/...as-in-bangkok/

I guess it matters what you were going to do in Bangkok,

worst case- if the area around the hotel floods then you could be stuck at the hotel , Probably someone will figure out an exit plan to get you to dry ground or BTS , small boats , tall trucks etc ,

if I was going and leaving from home I would go to walmart , and bring a few pair of chest high waders, one for myself and a few for others , that water is going to be real nasty !

A little adventure never hurt anyone

PS......and OK this is overkill but I might bring life vests for others that may need them.... I am sure there will not be any there if you wanted to buy them now.....

RB