The driveway in front of our garage builds a fairly large puddle in
the middle any time we get a significant rain.
Unfortunately, there is no way to slope the ground for the water to
run off.

I had one other idea for draining our driveway. This may be a stupid
idea, but I'll ask it anyway...

When we built our house foundation, we installed a french drain that runs
all the way around the house, and is then drained off over the side of the
hill. It would be a simple matter to tie a drain for the driveway into the
french drain system. However, would this be a "smart" thing to do? Would it
be unwise to intentionally direct the driveway water into the foundation
drain (we have a crawlspace foundation).

On a similar note, if I install 4" perforated drain pipes in the driveway
to catch the water, how far down should they be buried (so cars won't crush
them)?

Thanks,

Anthony