When I first tried to provide drainage for a new raised bed, I just dug out a hole down-slope from it.
I thought far enough ahead to know that water would flow downhill (out of the bed and into the hole).
But it didn't occur to me that water flows downhill ... and then stops.
So I dug a trench the full length of the dirveway and around a tree to get to the part of the yard that runs away downslope.
This, dumb as it was, is still smarter than the people who built the park. They had dug a similar trench that I uncovered as I dug. However, their genius-level design had water flowing UPHILL to get olver a tree root.
Water doesn't flow uphill very fast or very often.
