Beautiful!
I have built many a hugel type thingie on my property which slopes considerably, almost like a bowl with a steep edge going up. If I didn't create these "thingies" then the water would pool against that edge. Thought about just digging down and going for broke with a
pond, but being in the woods, we are already plagued with biting flies and mosquitoes, so laying hugels on contour works great to slow the flow. Since we have a ton of mature Oaks, some 20 of them, digging swales was out of the question anyway. This works great.
When I plant anything I create one of these on the downhill slope to catch runoff and keep the water for the various
trees and plants in place. It doesn't work as well as a
swale with a big water lense or anything but it definitely helps.
Keep on going!