I hope they lived!
I have a big fetish about "drainage" since I've only gardened in heavy clay with near-zero perk. Really, I like digging trenches and building raised beds lots better than weeding. At least I don't need to re-dig the same trench one week later!
And one gardening book that I read a lot while I was laid up and could not garden made much of "grading". So that really sank deeply into my unconscious.
Or maybe I have 10% mole ancestry.