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4 Facts about Gravity Sewers

plumberstives gravity sewer

There are different types of sewage system in the plumbing industry. Each type has features that are only suitable for a specific purpose, for instance, a gravity sewer system. This type of system has a huge difference when compared to a typical sewer system. This doesn’t need pumping stations and other equipment used to transport sewage and wastewater coming from establishments. On the other hand, during the installation process, there are things that should be followed for the sewer to operate. Aside from these, here are some other things about gravity sewer:



The velocity of the conveyed wastewater and sewage depends on the slope and gravity. The position of the pipe is an advantage when waste is being conveyed. On the other hand, the flow of all the waste transported to the treatment plant is helpful in getting rid of the grease, grime and filth that will stick to the interior wall of the sewer pipe. The flow inside the pipe should have the capability to remove all build up for at least 2 fps.


One thing that is known about gravity sewer is that it doesn’t require a pumping device. With that being said, the system should a proper maintenance to see the total amount of wastewater and solid waste that are flowing through the entire sewer system. Moreover, the loads in the pipe should be controlled by other fixtures in order for the pipes not to get too much stress. If the population of a certain area increase, the amount of sewage that will flow in the sewer system will also increase. If this happens, expect that there will be issues that will occur.

Size of the pipe

Professionals advise that the dimension of a sewer system should be big enough that maintenance tools can get inside in case of emergencies that requires repair right away. There should be a specific diameter to be used while keeping in mind that the gravity sewers will be half full during the day. Thus, there should be a space for the tools.

Sloping sewer

Gravity sewers are known to rely on the gravity exerted to the water and waste inside the pipe. Upon the installation of the sewage system, the system should be situated at a particular declivity to achieve its self-pacing speed it needs to transport wastewater and solid waste. However, if the contractors don’t achieve the procedure properly, the wastes need to be transported will never reach to the treatment plant. Instead, it will just build up in a specific area that will lead to a serious wastewater and sewage backup. With a certain flow velocity, the system has the ability to clean itself due to the water that flows through it. When the sewer system keeps to maintain its steady pace of water and waste, you don’t have to be concern of the build ups that might occur. This kind of sewer system is an advantage in contrast to pump-generated systems. Using gravity sewer decreases the expenses required to generate energy different types of the disposal system.