NYC to curb water runoff with blue and green roofs
"Our PlaNYC goal of making 90 percent of City waterways suitable for recreations requires us to do more, and that means reducing the combined sewer overflows that have plagued the City for decades,"
- Mayor Michael Bloomberg
New York City wants to catch and store rainwater temporarily in new roof systems to stop heavy storms sending sewage spilling into city waterways.
The catchment systems would consist of "blue" roofs that have a series of drainage pools and "green" or grass- or ivy-covered roofs, under a plan unveiled by Mayor Michael Bloomberg.
Bloomberg estimates the city could save $2.4 billion over 20 years if the state allows it to use this kind of green technology instead of relying on so-called grey infrastructure, such as storage tanks and tunnels.