I have a single family home in the city in MN. My detached garage abuts the alley, and I have a concrete slab next to it that spans the rest of my small property line (basically the back of my property is either covered by concrete or the garage.)
The issue I’m having is that the water draining away from my property to the alley is getting trapped along the garage. (The garage appears to be low on one corner because water will seep under the door a little ways). The fence posts around this spot have also started to be affected by frost-heaves. Either I have to raise the garage (really out of the question), lower the entire section of concrete next to the garage, or something else to get the water draining freely out to the alley, or at least not pooling against the garage.
There is no open ground to dig a French drain without tearing up concrete... I’m wondering if this group has any other ideas. Could it be something as easy as digging a low spot in my yard a few feet away from the garage, and planting a rain garden and have the water collect there in the spring instead of against my garage?