What is inflow in the context of wastewater systems?

Inflow refers specifically to the additional water that enters a wastewater system, particularly from sources that are not part of the intended design. It encompasses water that is introduced into the system through illegal connections, such as stormwater runoff or inflow from roof drains or other drainage systems that should not be directed into the sewage system. This unwanted inflow can lead to excessive volumes in the wastewater treatment system, potentially causing overloads, inefficiencies, and system failures.

Recognizing inflow correctly is crucial for wastewater management as it differentiates between the legitimate volume of wastewater generated and the extraneous amounts that can complicate treatment processes and lead to increased operational costs. Monitoring and mitigating inflow is essential for maintaining the integrity and efficiency of wastewater collection systems.