Best tag for sewage storm overflow?

What’s the best tag to use please (if there is one) to indicate sewage storm overflows? (These are places where, in times of high rainwater volume that is beyond the capacity of the sewage system, raw sewage is discharged into bodies of water - rivers, lakes, the sea).

Edit: I have at last found the following:

man_made=outfall
substance=sewage
outlet=bell_mouth
Or
outlet=direct

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Ce sujet de discussion accompagne la publication sur https://community.openstreetmap.org/t/best-tag-for-sewage-storm-overflow/102382