I have a concrete garage which is halfway inside the hill. Essentially the surface behind the garage is at garage's roof level. Garage's floor is concrete slab 3"-4" thick (at least it's best I could figure). I suspect that the base under the slab is in poor condition.
Some bright minds, presumably about 50 years ago, terminated drain holes inside the garage. So now I have water along garage sides year round. Also a bit of water sips through some cracks in the slab.
I don't want to dig around garage to install drainage because there is a large tree behind it which I don't want to kill. Plus it's very close to property line.
So what can I do to minimize the moisture inside the garage? I was thinking of removing the slab and putting drain pipes along garage walls. Then re-pouring the slab with proper base under it. The holes would then just drip directly into the drain pipe. Drain pipes can be terminated in sewer, then.
Does it make sense? Can someone recommend better option?