Green infrastructure is defined in the United States by section 502 of the Clean Water Act as the range of measures that use plant or soil systems, permeable surfaces, stormwater harvest and reuse, infiltrate or evapotranspirate stormwater and reduce flows to sewer systems or to surface waters. Green infrastructure encompasses various water management practices such as vegetated rooftops, absorbent gardens and other measures to capture, filter, and reduce stormwater. Green infrastructure prevents or reduces the amount of water that flows into storm drains and is proved as an important tool for cities with combined sewer overflows and nutrient problems. It provides many environmental, social, and economic benefits such as improved surface water quality, water conservation, and community saf