Your web browser is out of date. Update your browser for more security, speed and the best experience on this site.

Update your browser

all things water®

Contact Us

498 Seventh Ave, 11th Floor
New York, NY 10018

(212) 539-7000

Green Infrastructure

Sandeep Mehrotra, PE

Green infrastructure like rain gardens and green roofs use natural processes such as infiltration, plant transpiration, and evaporation to manage stormwater near where it falls in urban and suburban environments, significantly easing the strain on sewer systems.

Custom Solutions for Maximum Community Impact

Green infrastructure controls can serve as valuable additions to a community’s stormwater management toolbox, controlling the quantity and quality of stormwater runoff while also improving air quality, reducing the urban heat island effect, reducing chemical and energy demands at wastewater treatment plants, improving property values, and more.

A green roof is a roof of a building that is partially or completely covered with vegetation and a growing medium, planted over a waterproofing membrane.
Blue roofs are non-vegetated source controls that detain stormwater, either releasing it more gradually to the sewer system or storing it for beneficial reuse.

Our green infrastructure toolkit includes bioretention (rain gardens), subsurface infiltration, blue and green roofs, permeable pavement, rainwater harvesting, constructed wetlands, and more. We target "first flush" rainfall, significantly easing the burden on the sewer system and treatment facilities.

GI Interactive Cover
This interactive graphic outlines four common green infrastructure solutions: bioretention, permeable pavement, blue and green roofs, and pocket wetlands.

Our Work

Hazen’s green infrastructure solutions can achieve up to 75% mitigation of watershed runoff, even in ultra-urban environments with a higher degree of impervious surfaces. Green infrastructure can be implemented in phases, progressing as funding becomes available.