What Effect Does Rehabilitation of Wastewater Pipelines Have on the Share of Infiltration and Inflow Water (I/I-Water)?

Infiltration and inflow water (I/I-water) is a big challenge in sewage systems many countries. I/I-water above an acceptable level indicates that the system not functioning properly. leads to increased pumping costs overflow, leading pollution of receiving waters. Many rehabilitation projects are driven by need reduce share common measures replace pipes manholes. The predominantly rainfall. This makes it difficult document efficiency mitigating measures. One way address this issue compare data from areas where no have been implemented. Three Asker Municipality, Norway, were successfully assessed applying approach. has 100% separate system. strategy Municipality was rehabilitate mains, either full replacement or lining old pipes, assessment shows selected municipal proven be bad condition through closed circuit TV inspection, reduced only limited extent. Since done complete all manholes, effects assumed caused finding other ways into In than renovations should considered when aiming I/I-water.