Tweet The Marq2 was a 48-block long redevelopment project in downtown Minneapolis.  This project utilizes the Silva Cell, to contain large amounts of bioretention underneath the paving.  Photo courtesy of The Kestrel Design Group. Do you know what green infrastructure is?  It’s the stuff inbetween gray infrastructure (streets, piping, roofs, bridges, drains) and blue infrastructure (the lakes, rivers and other natural bodies of water).  Green infrastructure helps filter, clean and minimize the amount of gray infrastructure run-off that goes into our lakes, rivers and natural bodies of water. I learned all this from the brilliant landscape architect Peter MacDonagh, partner…