I don't really know anything much about building, but I do live in the high elevation areas of the Appalachian mts. and I observed what happened during Hurricane Helene. I saw way too many places where the saturation of water was at its max, and the mountains answer to this was to simply lift all of the topsoil and vegetation clinging to it up off the bedrock of the mountain, which in this case was absolutely beautiful green and pink rock called ukanite, and slide it down the mountain. This left gorgeous little creeks running over beautiful rock, but whatever, including buildings, was in the way of this lifted mass, just went with it. So, if you hit a wicked crazy rainy season, would having those ditches that run horizontally across the mountain-- I know they have an official name, I have one across my pasture that helps keep too much water from running down and causing a deep rain creek right outside my back door, but I know they're a thing up here in these mts. People (like me) have them across their driveways and wherever they think water might run and take the land with it. So, are you planning any of those up above your structure?