Basic Wastewater Operator Practice Exam

The term "infiltration and inflow" (I/I) specifically refers to the unwanted entry of groundwater and stormwater into the sanitary sewer system. Infiltration occurs when groundwater seeps into the sewer pipes through cracks, joints, and other defects in the sewer infrastructure. Inflow, on the other hand, describes the direct entry of stormwater into the sewer system, often through manholes or improper connections to storm drainage systems.

Understanding I/I is crucial for wastewater operators because excessive infiltration and inflow can lead to overloading of the sewer system, result in higher treatment costs, and contribute to sewer overflows. It is a significant factor that can affect the capacity and efficiency of wastewater treatment facilities. Effective management of I/I helps to maintain the structural integrity of the sewer system and protects public health and the environment.