Green infrastructure is a method of stormwater management to divert and reduce runoff, often by replacing impervious surfaces with natural soils and vegetation. Rainwater harvesting, permeable pavements, green roofs, urban tree canopies, rain gardens and bioswales and wetland restoration divert and filter stormwater locally, preventing flooding and pollution.
Increases in the frequency and intensity of precipitation will only increase the risks and costs associated with stormwater management. Across the continental United States, regions are experiencing a higher incidence of extreme precipitation and communities are struggling to respond and prepare.
The US Environmental Protection Agency (EPA) developed the National Stormwater Calculator to help people plan development by estimating runoff reduction for various scenarios. Users can determine how to meet a desired stormwater retention target with and without the use of green infrastructure.