How to leave water pipes in rural housing?

Because rural self-built houses don't have special sewage pipes like cities, the following matters need to be paid attention to in construction: \x0d\ 1. First, a U-shaped trap must be set between the floor drain and the horizontal branch pipe, and the water storage height of the trap shall not be less than 5 cm; \x0d\ 2。 The floor drain shall be a special odor-resistant floor drain or a composite floor drain; \x0d\ 3。 Pay attention to the elbow treatment between the sewage riser and the buried horizontal main pipe, and lead it to the outside after reaching the bottom floor. This place cannot be directly connected with a 90-degree elbow, but must be connected with two 45-degree elbows to avoid the intersection of two horizontal pipes being blocked. \x0d\ 4。 The diameter of underground horizontal main pipe should be as large as possible, generally not less than 150mm, and the slope should be as large as possible, not too slow; \x0d\ 5。 When septic tanks and outdoor holes (manholes) are built, exhaust holes should be reserved at the top cover to prevent the waste gas generated here from overflowing into the room along the exhaust main.