Today’s photo shows the 326 gallon marker on the Troll Avenue Bioretention System found is the Fremont area of Seattle. The goal, of the bioretention filter toxic storemwater runoff before it reaches Lake Union.
Toll Avenue is very step and when it rains a lot of water flows down the street. I was impressed that the bioretention system filters up to 641 gallons of water at a time.
The bioretention shown is part of a larger watershed project which filters hundreds of thousands of gallons of highway runoff annually.
The following photo shows a diagram the Troll Avenue Bioretention System.
