A properly designed, operated and maintained sanitary sewer system
is meant to collect and convey all of the sewage that flows into it
to a wastewater treatment plant. However, occasional unintentional
discharges of raw sewage from municipal sanitary sewers - called
sanitary sewer overflows (SSOs) - occur in many systems.
Rainfall-derived infiltration and inflow (RDII) into sanitary sewer
systems has long been recognized as a major source of operating
problems, causing poor performance of many sewer systems. RDII is
the main cause of SSOs to customer basements, streets, or nearby
streams and can also cause serious operating problems at wastewater
treatment facilities. There is a need to develop proven
methodologies and computer tools to assist communities in
developing SSO control plans that are in line with their projected
annual capital budgets and provide flexibility in future
improvements.
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