We used this in front of our garage and sodded over it. Installed about six years ago and starting last year we started having issues with drainage from all of the winter rains. Part of it is the slope of the area, but I suspect the clay beneath the grid has become compacted and prevents rain to drain off properly. Looks like I will be redoing it, but not sure how. I do not want a concrete pad there and gravel is not an option.