Five Benefits of Green Infrastructure for Your Community

Jacob Rischmiller, PE
,
Surface Water Practice Group Leader
March 31, 2023

Green infrastructure is often thought to only provide water quality, but the ancillary benefits are often overlooked. When looking to the next round of community improvements, cities can reap the following five benefits from implementing green infrastructure solutions.

1. Increase Flood Control

As communities combat aging infrastructure and increasing rainfall intensity, a focus on flood resiliency is more common. The engineering solution in urban areas is often providing additional capacity in the storm system. Though green infrastructure is typically sized to store runoff from smaller events, there are benefits that impact flood control. A common flood control benefit involves designing the inlet system to intercept water flow from the surface and bring it into the storm sewer pipes.

The ability to intercept runoff from the surface and into storm sewer pipes can often be the most challenging component in urban areas. With most of the nation's storm sewers being outdated, these features are much smaller than what is needed to capture today’s larger storms. They may only intercept stormwater at a capacity of a six-month event or less while most design standards today require capacity for a larger 10-year event.

2. Improve Water Quality

By design, green infrastructure's primary objective is to treat stormwater from typical rainfall events. It does this by mimicking the natural hydraulic response of the watershed prior to human impacts, slowing rainwater down and filtering it through various natural media including rock, soil, and sand. Urban pollutants filtered through this process include nitrogen, phosphorous, and particulate matter, which is picked up when stormwater runs through communities. Green infrastructure treatment improves downstream water quality and the health of natural ecosystems—including human life.

3. Maximize Health Benefits

Green infrastructure often incorporates native plantings into designs. Increasing the amount of natural plant features in an urban area can provide a positive impact to the physical and mental health of community members. Some benefits of additional native plantings include improved air quality, increased natural habitat for local wildlife, and added value to social capital and recreational opportunities. A reduction in and surface temperatures, noise levels, and crime are also possible. A study in Atlanta Georgia demonstrated the connection between a green street project and positive health impacts due to a number of environmental, social, and economic benefits.

4. Increase Utility Funding

Most communities utilize a stormwater fee to fund maintenance and improvements to their stormwater system. In polls given to residents in communities that ISG works in, water quality improvements are often ranked as high as flood control improvements. This means that when communities start incorporating water quality improvements into their public improvement projects, residents are often willing to pay higher fees for their utility.

5. Expand Economic Development + Growth

Housing and office tenants prefer to be in environmentally friendly buildings and forward-thinking communities. One example of this is in Des Moines, Iowa, where nine blocks of the Market District is being redeveloped. The theme of the redevelopment is sustainability, with water quality at its focal point. The project will include installation of over 80 bioretention cells that provide water quality treatment for all the future blocks and the public right-of-way. This new and improved living and working area is becoming a reality because the developer recognized that people want to be in areas that are focused on sustainability.

Learn more about ISG’s green infrastructure experience here.

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Jacob Rischmiller, PE
Surface Water Practice Group Leader
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Jacob Rischmiller, PE

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