Minneapolis Does Storm Water Retention Right

The mile stretch of the Marquette Avenue (pictured) and Second Avenue South transit project in Minneapolis includes wider sidewalks?EUR??,,????'?????<

 

When it rains in Southern California the runoff, with all its contaminants and everything but the kitchen sink, ends up washing up on the beaches.

In Minneapolis all that urban clutter ends up in the Mississippi and along
its banks.

Some Southern Calif. communities are working on the storm water problem www.landscapeonline.com/research/article/12986, and so is Minneapolis. Some 15,000 square feet of permeable pavers (Willow Creek Brickstone) were installed as part of the Marquette Avenue and Second Avenue South transit project in the heart of the downtown Minneapolis business district.

The storm water retention system, made by DeepRoot, comprises an underground grid of nearly 11,000 plastic-framed cells filled with a bioinfiltration soil mix. A grated cap goes over the top of the filled cells and is covered with a geotextile membrane. A layer of granite infiltration stone 2-3 inches in diameter is atop the geotextile, followed by a layer of smaller granite bedding aggregate. The permeable pavers are laid on top of the aggregate, allowing runoff to drain through the aggregate-filled voids into the soil-filled chambers below.

The interlocking concrete permeable pavers allow storm water to drain through aggregate-filled voids between the pavers into subsurface detention areas, where it?EUR??,,????'?????<