[Vision]

So, all the run off from toilets runs under a city street only sealed off from a manhole cover? And it could run into an open pond?

[Arrowhead1952]

So, all the run off from toilets runs under a city street only sealed off from a manhole cover? And it could run into an open pond?

Certain storm sewers are designed to run into the sewage treatment ponds, because of their origination. The storm water is treated along with the sewage from toilets and other household uses, dishwashers, clothes washers, etc.

These storm sewers normally have diverter valves that open to let heavy storm sewer discharges go directly into the treated sewage ponds and used as watering sources for golf courses, etc.

Apparently, the valves did not work properly or were jammed by all the rain water.