Green Infrastructure

Storm drains and pipes that collect stormwater and transfer this runoff to local waterways are gray infrastructure. In contrast, green infrastructure utilizes natural plantings and structures to capture, absorb, filter and/or reuse stormwater.

Green infrastructure practices help to restore the natural water cycle which reduces droughts and prevents flooding.

Strategies include:

  • Rain gardens utilize a shallow depression filled with native plants to capture and filter stormwater, providing beauty and encouraging wildlife.
  • Bioswales are similar to rain gardens, but also move water away from buildings to better locations for adsorption. 
  • Downspout planters are plant boxes installed at the base of a gutter downspout. They capture water for reuse while showcasing your flowers.
  • Stormwater planters and tree filter boxes are a type of basin built into a sidewalk to capture stormwater runoff from the road or sidewalk.
  • Rain barrels or cisterns capture rainfall, typically from a roof. This water can then be reused for watering gardens or washing vehicles.
  • Permeable pavement allows water to quickly pass through the pavement to an underlying layer that allows storage until it is fully absorbed. This includes porous asphalt, pervious concrete, and interlocking pavers.
  • Dry well systems utilize underground containers to accept large volumes of stormwater, allowing it to slowly seep into the ground.

Want to learn more? Check out Rutger’s New Jersey Green Infrastructure Guidance Manual.

Did you know?

  • Rain, rain, go away. In 2018, Mercer County experienced the highest annual precipitation ever recorded; a developing trend.
  • We’ve paved paradise. Our driveways, roads, parking lots, rooftops and sidewalks add up. The amount of Princeton’s landscape that is impervious, or unable to effectively absorb rainfall, has reached 14% over the years.
  • A dangerous combination. Increased impervious landscape combined with heavier rains leads to more flooded homes and blocked roadways.