4 Properties of a Gravity Sewer
Gravity sewers are one of the most recommended and utilised type of sewers for residential and community sewage systems. They make an efficient and low-budget option since they are capable of collecting sewage from households without having to require varied pumping equipment and pumping stations. As the name suggests, it depends heavily on the gravity to convey the waste and wastewater through the pipelines. This is the reason why a sewage system that uses the methodologies of the gravity sewer has pipelines that are laid on the ground following strict and specific gradual declivity in order to maintain a self-cleaning velocity that also allows it to effortlessly transport the load from the community to a treatment plant.
If the slope for the system is not declined enough to convey the load properly, there could be a build-up and accumulation of sewage particles. This particular velocity of the water should be maintained for the pipelines to be able to clean itself along with the transportation of wastes. Also, most of the sewage system with this sewer type are laid straight and have to avoid having bends and curves to avoid sewage deposits. Here are other characteristics that you have to know about a gravity sewer:
1. Slope of Sewer
While laying out a gravity sewer, the pipes should be laid with a certain declivity to aid in the flow and self-cleaning properties of sewer. If they are not laid that way, as it travels to the treatment plant from the residential property, a certain flow of velocity is needed to be acquired. The flow would prevent particle accumulation in the sewer pipes. Also, with this property of the gravity sewer, you will not require time-consuming and costly maintenance methods.
2. Design Flow
When using a gravity sewer system, the flow capabilities of the sewer system should be organised and calculated accurately to meet the sewage flow level of a certain area. As the population of the area grows, the capacity of the pipelines and the capability of the sewer to carry instantaneous flow of sewage increases as well. Also, the strength of the pipelines would greatly affect since the load increases during certain times of the day when the drains are used. When you know the total load of the pipes, allowances can and should be included in the expected load of the pipelines.
A gravity sewer is dependent on the gravity to make the transportation of sewage possible and successful. This is the reason why there should be a certain level of declivity in the positioning of the pipes since the gravity is the pushing force of the flow. The velocity of the flow of sewage prevents particles from accumulating in the sewer lines. This will help avoid future blockage in the pipelines that will surely lead to costly repairs and incessant needs for sewer rehabilitation in case of severe damage. Remember that the flow capacity should be around 2 fps in order to maintain a self-cleaning velocity.
4. Pipe Size
A lot of plumbing professionals suggest that the sewer pipes should be large enough for the sewage to fit even when multiple drains are working at the same time. Also, you should remember that a bigger pipe has less pressure than a smaller pipe. This means that there is a lesser probability of pipe damage in digger pipes since they have more room for flow.