← Use Cases Respond
What is this?
Identify when combined sewer overflows (CSOs) discharge untreated sewage into rivers or coastal waters, log the event, and notify regulators.
When does it happen?
During and after heavy rainfall that overwhelms sewer capacity. In the UK, water companies must now monitor and report all storm overflow events.
What data is used?
Flow sensors at CSO outfalls, rainfall data, sewer level monitors, event duration and volume logs.
What decision is made?
“Is an overflow occurring? How long has it lasted? Does it breach permit conditions?”
What action follows?
Log the event; notify the environment regulator; publish data for public transparency; trigger post-event investigation.
Related decision patterns
Proven strategies for handling this scenario:
Deep storage tunnels
Cities with old combined sewer systems overflow raw sewage into rivers during heavy rain. This pollutes waterways and harms public health.
Case studies
Real-world examples of this use case in practice: