What is typically the source of excessive clear water entering a collection system?

Excessive clear water entering a collection system primarily stems from infiltration caused by a high water table. When the water table rises, groundwater can seep through the soil and into the collection system through cracks and porous materials in the pipes, joints, and other system components. This type of infiltration is a significant concern because it can lead to the treatment system being overwhelmed, increased operational costs, and potential overflow or backup issues.

Rainfall accumulation can contribute to clear water inflow, but it is typically more associated with surface runoff rather than the steady, sustained inflow that is witnessed from a high water table. Leaky connections can also allow water to enter, but they are usually localized issues rather than a systemic condition linked to groundwater levels. Pumping station overflow generally indicates a failure or capacity problem in the system instead of a source of clear water entering the collection system. The main takeaway is that high water tables contribute to long-term infiltration issues that can significantly affect the efficiency and capacity of wastewater treatment systems.