Garage door seal and drainage - good idea or terrible idea?
So the garage at our new place has a bit of a water intrusion issue that I'd like to sort out.
The garage has two main alley-facing doors and a single (unpowered, ultra-cheap) vehicle door facing the yard - basically it's a drive-through in one bay. Handy when needed but it spends the vast majority of its time closed and I don't generally move vehicles through it.
The problem is that the slab slopes along the length of the door and towards the middle of the garage, so in heavy wind/rain water just pools in front of the door, flows down along the bottom seal, and then enters the garage where the door seal ends:
» Click image for larger version
The seal under the door works fine, it's just the area where that seal ends that doesn't keep water out.
Since the slab is elevated above the lawn on that side, I had the idea of cutting a few small (or one large-ish) drain channels at the corner of the door (see red lines) that would direct that water down into the lawn instead of through the middle of my shop. I don't plan to cut all the way through, just enough to provide a spillway - maybe an inch deep.
Good idea? Awful idea and my slab will fall to pieces? Is there a better solution I don't know about that isn't hugely expensive?
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