Today and yesterday I was helping some friends with the repairs of a flower planter at a church. This planter leaked water inside the building and needed to be fixed. It turned out the bottom was not level and it was dug out about 6" below the weep holes. This allowed the water to collect and leak into the building. When we finish the work in the next 2 weekends, I will show you how to solve the problem.
The work was a little rough going as we had to break out some concrete with the jackhammer. The concrete appeared to be extra hard. Finally success, we were able to break out the old concrete so we can level out a drainage bed and water proof the building wall next weekend.
As you can see the front was about 6" higher and allowed water to collect.
This is the view from the outside of the flower box.