Kelly Beck wrote: Be curious! Try stuff! I've gone from having a black thumb to having successes.
Sounds like a rock-filled version of a swale! I did similar where I wanted to redirect the water run-off from a roof, but didn't want a tripping hazard. I've also done a similar idea by burying logs I split in half, so that the flat side was up and covered with dirt, and made water-holding paths that way.
1: Rock Pit: Under pathways, I dug down about 2-3 feet and filled them with the landscaping rock I had in abundance.