We have this one area in our backyard where everything else drains. We’ve had so much rain that it has killed the grass and is now a mud pile. Just a few drops of rain and it becomes a lake again.
About once a year I get out during a rainstorm and work on my drainage. I have a corner lot. I have it so it drains from the back patio, behind the garage to the back fence. Then along the back fence, under the side fence, and across the yard to the street.
I know the neighbors think I’m crazy out there ditching during a downpour.