This is a follow up question to How long does caulk need to dry in a 1" gap?
Some additional background information is that this is in China and bathrooms are not designed for contained bathtubs/showers but generally slant all the floor tiles towards a single drain. Many households have no shower stall and allow shower water to spray everywhere in the bathroom. After a shower they mop or squeegee the water towards the drain.
We have a glass shower stall but because of the slope of the floor it doesn't lie flat. There is a large gap on one side where the floor slants to allow water from the entire bathroom to flow towards the drain. I've been having trouble keeping the shower water from washing away the caulk placed over this gap (see previous question for a picture and details).
I'm pretty sure now that the solution is to fix the floor slope so that water doesn't pool up and wash away the caulk. How should I do that?