In rural areas, drainage is often very simple, and used water seems to have a place to go. In fact, sometimes drainage is not allowed to be discharged at will, and it is still very particular about Feng Shui. If discharged in disorder, it may bring bad luck or economic destruction to families. It belongs to "one of the top ten unlucky environmental geomantic omen". From the Buddhist point of view, spiritual bodies like to gather in dark and smelly places, such as toilets, garbage spots and sewage pipes. Therefore, it is easy for gods to enter the house and make trouble, which leads to bad luck and bad family. Solution: Install a red constant light at the door and cover the top of the pipeline with soil.