The short story
There are two ways there can be too much water. Either rain causing flooding (of fresh water) or a very low pressure system causing the sea level to rise (with salt water). These two different phenomenon can often be combined since a low pressure system also often comes with lots of rain.
You are perfectly safe by staying indoors at Mantra Trilogy if any of these events occur. However, it might be dangerous to go on a road trip where the road might be cut off.
The long story
There are some resources to keep you informed: