What is the arrangement for diverting excess sewage from the combined sewer called?

What is the arrangement for diverting excess sewage from the combined sewer called? Correct Answer Siphon spillway

The overflow channel is connected to the combined sewer through the siphon. At the crest level of siphon an air pipe is provided to activate the siphon when water will reach in the combined sewer at a stipulated level and is called siphon spillway.
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