Comparison Between Circular Sewer Pipe and Non-Circular Sewer Cross Sections

Abstract

Abstract Circular pipes offer a significant advantage over non-circular ones because they maintain a higher flow velocity when half full or nearly full, even when the slope is the same. This advantage stems from the geometry of circles, which, among all polygon shapes, has the largest area for a given perimeter. As a result, circular pipes are the most cost-effective option for construction. However, when dealing with relatively low fluid flow, circular sections may not be the most efficient choice. At lower flow rates, there is greater friction when the flow cross-section is increases, leading to lower flow velocities. This lower velocity is the main drawback of circular pipes, as it provides more opportunities for sediment to settle within the pipe. Sewer system where the water level varies throughout the day. Using the Manning equation, you can easily observe this phenomenon. As the water level decreases, the flow speed also slows down because the space available for water to flow through becomes more restricted. When the water flow is reduced, maintaining a sufficiently high flow speed is crucial to prevent the accumulation of waste or debris. This emphasizes the importance of exploring different shapes for sewer pipes to find the most effective one. The current research employed both numerical and graphical analysis to illustrate the subtle differences between circular and non-circular cross sections. This discrepancy is particularly evident within a fullness ratio range of 0.05% to 0.25%. Conversely, beyond this range, circular sections exhibit a relatively higher velocity.