What causes blockages to occur?

Blockages can occur for two reasons. The first is the accumulation of material inside of the line. Draining unsuitable substances through the sewer, such as kitchen fats and greases or sand, clay or mud, can cause a buildup and blockage in otherwise properly constructed sewers. However, the proper operation of a sanitary sewer line requires that the line be constructed "on grade", that is with a consistent slope. High or low areas along a line will cause small amounts of greases soap scum and other material to accumulate, eventually causing a blockage. "Clean Outs" provide the homeowner or sewer drain contractor an access point for sanitary sewer line maintenance.

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1. What causes blockages to occur?
2. Does it make a difference how much water gets into the sanitary sewer system?
3. What causes sewer odors inside the house?
4. What is the purpose of vapor traps?
5. What is the purpose of a roof vent?