If you had 6 inches of rain and it drained out in a day or even two then my opinion is little to worry about but if you had water problems before then when the right conditions come reacure then I would rather have the underliner drain already installed rather than need to install one when I was done.
The solution is actually quite simple . They have like four pipe put to gether making more of a mat that you place before you place fabric or liner if you are worried about it id make a bed of gravel so the water can travel.
Water will always take the path of least resistance so it will rise up the empty pipe before it tries to lift the rubber. We call that the hippo
The solution is actually quite simple . They have like four pipe put to gether making more of a mat that you place before you place fabric or liner if you are worried about it id make a bed of gravel so the water can travel.
Water will always take the path of least resistance so it will rise up the empty pipe before it tries to lift the rubber. We call that the hippo