What do we call stormwater and groundwater that enters the collection system through cracks and other openings?

The term that describes stormwater and groundwater entering the collection system through cracks and other openings is "Infiltration and Inflow." This phrase specifically refers to the process of water from outside sources, such as rainwater or groundwater, mingling with the sewage system.

Infiltration pertains to the water that seeps through the soil and cracks in pipes and infrastructure, while inflow happens when rainwater or surface runoff directly enters the system, typically through improper connections or openings. This phenomenon can significantly affect wastewater treatment operations, leading to increased volumes that the system must handle, potentially overwhelming capacity and impacting treatment processes. Understanding this terminology is crucial in wastewater management and helps in identifying and addressing issues related to excess water in the collection system.