Relationship between geomantic omen and viaduct

Need to have a specific schematic diagram or orientation. In cities, viaducts can be regarded as rivers and buildings as mountains. Generally speaking, it is good to be located in the south of the mountain, that is, if the viaduct is in the south, it will be better to be near the mountains and waters. It is better to be in the inner arc of the viaduct, and the outer arc is against the bow water, which is not good. The head sound demon and the golden demon are still much worse than the real river.