When large amounts of rain or snowmelt flow into storm drains, the increased volumes exceed the treatment capacity at the plant. That causes a mix of untreated sewage and water to be diverted around the plant and into the river.
When large amounts of rain or snowmelt flow into storm drains, the increased volumes exceed the treatment capacity at the plant. That causes a mix of untreated sewage and water to be diverted around the plant and into the river.