 A dry riverbed? A wadi, to be precise. But the ground is all sand. Thus, making it easily workable. You see how it yields readily to the ministrations of my power post hole digger? Uh, Eugene. Once the holes have been dug, I merely insert carna posts. Add framing, joists, and rafters. Uh, Mr. How-To, do you hear that? Pop on the roof.