What is a French drain?
Have you experienced a flood garage or water seeping into your house? Chances are you have (link removed) designed driveway.
Ideally your driveway ought to be downward sloping away from your house carrying any excess water out of your house (not towards it). This will prevent flooding in your garage or house.
If water is flooding your driveway or house frequently, consider installing driveway drain in between the garage and your driveway to preve