Q: What is behind the door labeled “Aqua Swirl” in the Library Lane parking structure?
A. The rain that falls on the deck of the underground structure is channeled to the Aqua Swirl, which uses centrifugal force to extract coarse sediments, debris, and oil. The system has no moving parts and relies on gravity for its work. The pollutants are periodically pumped out by a vacuum truck for disposal. This process reduces the pollutants going into the storm sewer and the Huron.
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