From 2008 to 2012, the City Council of Portland, Oregon (USA) adopted an Ecoroof Incentive instrument to address the city's stormwater management problems. The incentive provided financial support to promote the installation of green roofs and innovative roofing methods to better manage and reduce annual runoff volume by 50%. The incentive was offered for property owners and developers of Portland to construct eco-roofs at a rate of €4,74/m2 ($5/ft2).By 2012, the Portland Bureau of Environmental Services (BES) at the City Council granted almost €2 million, which helped fund over 130 projects. The overarching impact of the instrument resulted in creating more than 32500 sq.m (8 acres) of eco-roofs and managing an average of 20 million liters of stormwater each year. Later in 2018, the instrument was incorporated into the Central City 2035 Plan (CC2035), under the 33.510.243 Eco-roofs Code that applies newly constructed buildings to have green building design.