urban trees Archives - Center for Watershed Protection

Trees and Stormwater Runoff

What is Stormwater Runoff and Why Do We Need to Reduce It? Stormwater runoff is rainfall that flows over the ground surface. It is created when rain falls on roads, driveways, parking lots, rooftops and other paved surfaces that do not allow water to soak into the ground. Stormwater runoff is the number one cause of stream impairment in urban areas. Where rain falls on paved surfaces, a much greater amount of runoff is generated compared to runoff from the same storm falling over a forested area. These large volumes of water are swiftly carried to our local streams, lakes, [...]

Planting and Maintaining Trees in Urban Areas

Approximately 80% of the U.S. population lives in cities. As a result, more and more people are disconnected from natural areas such as forests and are unable to reap the daily benefits they provide. This makes urban trees extremely important for providing shade, removing air pollutants, reducing stormwater runoff, and providing recreational and aesthetic benefits. If you don’t think urban trees are important, consider this: Properly placed trees can reduce heating and cooling costs by 10-20% on average within 10-15 years after planting (Heat Island Group 1996). Sales prices of homes with trees increased by 3.5% to 4.5% over similar [...]