The New York City Green Infrastructure Plan requires USD 2.4 billion of investment from the public and private sectors, in swales, green roofs and other source controls to manage runoff. This will have further benefits, including cooler temperatures, improved air quality, more green space, lower energy bills and higher property values. New York City’s Green Infrastructure Plan will change the city form and reduce combined sewer overflows (CSOs) by 12 billion gallons per year, 2 billion gallons more than the existing grey strategy, at a savings of more than USD 2 billion over the 20-year implementation period.