4 Major Properties of a Gravity Sewer
Gravity Sewer System is one of the most utilized sewage disposal layouts in communities because of the fine qualities and benefits the government can acquire from them. When it comes to the disposal of the community wastes, the government will always look and opt for the most convenient, budget-saving and effective method of going about the task. The problem is that wastes that are accumulated from throughout the community – that is hundreds or maybe thousands of homes, are usually a couple of tons in weight and volume that no ordinary sewage system is capable of transporting much less storing everything in one place for them to be ready for processing before the bulk gets disposed into different bodies of water.
Gravity Sewer System does a great job in doing all these without having to sacrifice the effect that the community expects to have. Though there are a number of different sewage system kinds, the gravity sewer usually is the pick for most community because of the following properties that makes it both effective and budget-friendly:
- Slope of Sewer
During the initial installation process of the Gravity Sewer, the contractors and engineers should be mindful of the require declivity level that the pipes should have in laying them on the ground. This sloping degree allows the sewer system to pull the wastes from residential of private sewer line and collect them in one major pipe for transportation into the community’s treatment plant. Also, remember that this building feature holds the key in making the system actually operation. Since the Gravity Sewer System is not equipped with a pumping station, the declivity level is the system’s only source of movement.
The Gravity Sewer relies on the slope degree and the gravity, as what the name suggests, to be able to move its load from one point to another. Through this point, the system also gains its velocity and self-cleaning properties. If the system is not allowed of the required sloping degree, the contents will remain stagnant resulting to a failed sewage system, waste backup, blockage and eventually rotting of the wastes that can lead to serious medical issues and environmental pollution.
- Design Flow
When using a Gravity Sewer System, the contractors and engineers should be able to compute carefully for the peaking factor of the system. In certain times of the day or during certain seasons, there will be an increase in the load of the sewer lines. During storms for instant, the water runoff will tent to increase and, if the system is not quite geared for this event, the sewers could overflow and contaminate water supplies create a much bigger problem. Or, n some cities, flooding will occur and it will take a major government effort to keep the situation under control or to equate the whole city. All of this is due to a minor miscalculation and overlooking of a detail. Every sewer system should be allowed allowances for situations like this.
The flow of the load inside the sewer pipes should be at least 2 fps to allow the system’s self-cleaning facilities to effect. The velocity is totally dependent on the slope of declivity the pipes where laid by and the gravity. It is also important that the system is going down slope and that there should as little bends and curves as possible. The more direct and straight the lines are the better.
- Pipe Size
The bigger the size of the pipe, the more it can handle the pressure, the peaking factor and the load inside. Put it this way, the bigger the pipes are, the more fluid the flow of dead load and, therefore, the lesser problem the government and the contractors will have for this aspect.