That wall with the pine shadow is about 10 feet tall. Protecting against the natural inclination of the mountain, which is to drain right there, and to other side. When I found Gondolin some years back, there was a bog to the back and right of the garage shown above, all due to a drainage pipe further up the hill passing on water from still yet further up the mountain. This bog was relatively new and had just killed most of the pine trees in the vicinity, to my chagrin, for it opened up a gap in my fence of pine and wood. And so with all long term considerations given, this must be addressed by draining the bog. And so I dug (and dug, and dug, and dug...) a stream:
You can see a portion of it in the upper left. Here's a closeup of that stretch:
Not the best picture, and for that I am further chagrined. But you get the drift, I hope? A small channel dug into the ground corralling a previously creeping, spreading flow of water that soaked a large area. Another shot, of the newly dug lower stretch:
I also just cleared the deciduous trees and shrubs to the right, as I am truly gardening the forest, pruning deciduous where I can in favor of conifers. You can see the new leafy trees directly ahead, probably 10-15 years old and grown in since this land was first clear. They claim any new land first, and I wonder how the conifers ever gained a foot hold at all. Fun fact to know and share - the entire conifer family is only approximately 300 million years old.
Anywho, the bog is gone, and the stream is now some 400 feet long, all dug out and waiting to be prettified. The amount of water channeled through this system is incredible, and even more so, I've got projects here in Gondolin to last a lifetime. I envy myself.
As a goodbye, here's an artistic blurry photo of a deciduous bloom, in honor of all its fallen sisters: