[gr8fl4porsche]

I am going thru the same issue right now. Add in a black Targa and that could be my garage. The problem is water flow. Water is flowing towards the door. Only real fix is to add a trench drain in front of the door opening to catch the water before it gets to the door.

This is not an easy or cheap project. Requires saw cutting out a section of concrete, trenching, installing a drain system which needs to connect to some other drainage system, and then pouring concete.