The swales I dug are only 12-18in deep. Very shallow. No concerns of slipping for me.
Discussion
+ the root structure of the trees and grass around your swales for natural foundation 🤔
Furthermore I think you should count with directionality of your water. This includes the vertical direction of absorbtion rate.
I was truly impressed by your "symbiotical landscaping", swales being only part of your watermanagement. 🫡
So impressed I was flabbergasted and I only now realize I didn't take any pictures at all 🤣
I guess that is experiencing the moment vs. capturing the moment ☺️