What causes a maintenance expense and odor nuisance in flatter sewer line grades?

A decrease in velocity within flatter sewer line grades is significant because it results in the inability to effectively transport waste and sewage through the system. When the velocity is reduced, solids can settle at the bottom of the pipe, leading to the accumulation of sludge and debris. This buildup can cause frequent clogs, which not only elevate maintenance expenses due to the need for regular cleanouts and repairs, but also contribute to odor nuisances as decomposing organic materials release gases into the sewer system.

In addition, the stagnation of flow in flatter sewer lines can exacerbate the formation of odors, as there is insufficient movement to keep the contents of the pipe flowing and properly mixed. The presence of standing waste provides an environment conducive to anaerobic conditions, which produce unpleasant smells. Therefore, the decrease in velocity directly results in both maintenance challenges and the development of odor issues in sewer systems.