Cities turn to green roofs to protect the environment

Milwaukee has been in the news recently as it moves ahead with plans to remove residential sources from the city’s sewer system in the hope rain water will soak into the soil and prevent sewage overflows into Lake Michigan.

Flooding is an issue for many cities in these days of increasing urbanization, so the search is on for ways to control runoff.

To prevent runoff flooding, cities around the world are adding requirements for permeable pavement and green roofs to building codes.