The minimum recommended diameter of sewers is 10 cm. This is because a 10 cm diameter sewer can accommodate the flow of wastewater from a typical household. If the diameter of the sewer is too small, it will not be able to handle the flow of wastewater and will become clogged. This can lead to sewage backing up into homes and businesses.
A 5 cm diameter sewer is too small to handle the flow of wastewater from a typical household. It is only suitable for very small homes or businesses that do not generate much wastewater.
A 15 cm diameter sewer is larger than necessary for a typical household. It is only necessary for larger homes or businesses that generate a lot of wastewater.
A 20 cm diameter sewer is very large and is not necessary for most households or businesses. It is only necessary for very large commercial or industrial facilities that generate a lot of wastewater.
In conclusion, the minimum recommended diameter of sewers is 10 cm. This is because a 10 cm diameter sewer can accommodate the flow of wastewater from a typical household. If the diameter of the sewer is too small, it will not be able to handle the flow of wastewater and will become clogged. This can lead to sewage backing up into homes and businesses.