Inflow/infiltration is a parasite that robs the collection system of capacity. It is also an indicator of the condition of the sewer system. High inflow/infiltration is associated with system deterioration. By using inflow/infiltration as an indicator, the public works staff can evaluate its rehabilitation program. It is significantly less expensive to rehabilitate a sewer system than to replace it.
Extending the life of the sewer system assets is the least cost alternative to replacement. Without a rehabilitation program that will locate and identify repairs, the staff will be faced with increased "emergency repairs" and increasing SSOs. Analysis of inflow/infiltration will identify and prioritize those areas of the collection system that are in need of rehabilitation. This ensures the limited resources of the municipality are being targeted at the high priority assets.