Philadelphia is a worldwide leader in implementing GSI (green stormwater infrastructure), a sustainable and natural way to manage urban stormwater and improve our rivers and streams. Over the next 20 years, Philadelphia will implement green projects (rain gardens, green roofs, etc.) all over the city, often right beneath your feet. Help us show off these innovative green practices by developing a guided tour app to highlight the benefits of GSI to neighborhoods and the environment. New datasets have been released on opendataphilly.org - search "stormwater."