Parks Can Also Be Green Infrastructure

Historic 4th Ward Park / Beltlandia.com
Historic 4th Ward Park / Beltlandia.com


City Parks, Clean Water: Making Great Places Using Green Infrastructure
, a new report from The Trust for Public Land (TPL), makes a strong case for leveraging public parks to manage stormwater. The report offers several useful case studies that explain the challenges and opportunities involved in designing parks to act as systems for storing or absorbing excess stormwater. 

The problem of stormwater, as many readers know, originates with the vast amount of asphalt and concrete used in urban areas. Where once stormwater would have filtrated into the ground, asphalt and concrete shed it toward sewer systems. That water, toting pollutants and grime from streets, gets conveyed to rivers, lakes, and other water sources that people use. It is never cleansed by soils and plants, never replenishes groundwater, and often overburdens sewer systems and local waterways, causing flooding.

A potential solution to this problem, according to report, is to use parks to do the work of traditional grates, pipes, and sewage and stormwater treatment facilities. Parks are ideal for providing this service because they already exist in most cities and can be designed from the beginning, or even retrofitted, to serve both recreational and ecological functions.

The report offers five case studies of cities that deployed parks as green infrastructure and were rewarded with working landscapes that beautify their neighborhoods and allow for recreation:

The award-winning Historic Fourth Ward Park, which is part of Atlanta’s Beltline, sits in a lowland, industrial area that was heavily prone to flooding. One of its major features, a 5-acre storage pond, serves the function of what was intended to be a $40 million underground tunnel, according to HDR Inc., the landscape architecture and engineering firm that designed the park. The pond can handle a 500-year flood.

Kevin Burke, ASLA, senior landscape architect for the Atlanta Beltline, said the stormwater storage function of the park is working well: “We’re in the position where the city has allowed two additional developers to tie their runoff to the pond.”

The park does not infiltrate or clean stormwater, its only job is to store it. The report strikes on this point repeatedly, that stowing and slowing water outflow with green infrastructure goes a long way to preventing flooding and lifting the burden off treatment plants.

The report also highlights Railroad Park in Birmingham, Alabama, designed by Tom Leader Studio, as another economic success. The park has incentivized $185 million in development in the area and receives 500,000 visitors annually. Many of these visitors come expressly to see the birds and wildlife that flock to its water-managing wetlands, according to Railroad Park Foundation director Camille Spratling.

“When the lake was built, it was the first time we saw the Birmingham skyline reflected in the water,” Spratling wrote. “That was a real point of pride.”

Railroad Park / City Parks Blog
Railroad Park / City Parks Blog

The report acknowledges it’s important to think out all the options, asking decision makers to consider the following about gray vs. green infrastructure: “Do both approaches work equally as well? Is one less expensive? Can they be combined? Are residents willing to put up with years of tunneling under then neighborhoods? Conversely, does the city have enough unbuilt land to capture water on the surface?”

Other questions to answer before turning to green infrastructure: should the park also absorb stormwater? If so, what is the cost to amend the soils of existing parks so they can better infiltrate stormwater?

“The mere presence of a grassy park does not guarantee water infiltration,” the report states. Water runoff rates of urban soil, which is often heavily compacted, can approximate that of asphalt. Factors such as budget, precipitation patterns, native soil porosity, and depth to water table must be considered when amending the soil of parks, the report suggests. Maintenance of parks and their water management features can add to the cost of green infrastructure.

But, according to Burke, the investment was well worth it: Historic Fourth Ward Park has spurred hundreds of millions of dollars in development in the neighborhood.

Landscapes & Gardens: The Works of Hargreaves Associates

Landscape & Gardens / ORO Editions
Landscape & Gardens / ORO Editions

“Gardens, parks, landscapes – these diverse scales and intensities of cultured nature all play important roles in our lives. This small collection is a provocative visual reminder of the enduring design potential of landscape space as public space,” writes Julia Czerniak, ASLA, professor of architecture at Syracuse University, in the introduction to Hargreaves AssociatesLandscapes & Gardens, a small but rich landscape architecture monograph on the work of Hargreaves Associates.

Hargreaves Associates, which won the 2016 Cooper-Hewitt National Design Award for landscape architecture, has worked in the U.S. and abroad for decades. Their principals — George Hargreaves, FASLA, Mary Margaret Jones, FASLA, and Gavin McMillan, International ASLA — have put together a compelling case for well-designed public landscapes wherever they may fit, like the recently-constructed Crescent Park in New Orleans or the Queen Elizabeth Olympic Park in London, both of which emerged from degraded brownfields.

Crescent Park, New Orleans /
Crescent Park, New Orleans / Johanna Liebe
Queen Elizabeth Olympic Park, London /
Queen Elizabeth Park, London / George Hargreaves

As Czerniak contends, “Design matters. The design premises the projects employ offer glimpses into many of the larger themes that have consistently produced the firm’s successful work; a firm with an international reputation for its advanced design, technical expertise, public engagement, and the ability to get projects built in the context of complex politics and tough economics.”

The book is a mostly-photographic argument for increasing public investment in landscapes, parks, and gardens in the era of the public-private partnership in which parks are expected to raise lots of money to cover their own operating expenses and maintenance. But Hargreaves himself also writes eloquently about the subject:

“A successful park has loyal followers—people who identify a park with their culture, their region, their city, and their daily lives. This identification may be due to a particular activity in the park, but more often it is due to the gestalt of the overall park experience—said another way, the look and feel of the park. Landscapes can inspire through their visual qualities, tactile qualities, and contrasting or unifying qualities. They can inspire through their sustainability or their habitat creation, and they can inspire by providing human interaction with plants and wildlife. Through time it is the landscape that is remembered and privileged much more than income-producing programming. If we can produce landscapes for public space that embody these inspirational qualities, it will not matter when the programmed activities evolve, disappear (such as the 2012 Olympic games), or increase. History has shown us that, if it is done richly and robustly, a landscape can last for hundreds of years.”

Haihe riverfront park, China /
Haihe riverfront park, China / Zhuomin Peng

The book is organized by landscape design features, with brief chapters on striations, walls, islands, ribbons, along with underlying, core elements of landscape architecture, such as native plants, rain, and background / foreground.

Landscapes & Gardens clearly demonstrates that Hargreaves Associates can create memorable and immersive experiences in their “quiet, green spaces.” For example, anyone walking through Crissy Field in San Francisco is likely to remember the sense of tranquility that remarkable place engenders.

Crissy Field, San Francisco /
Crissy Field, San Francisco / George Waters

For Hargreaves, the challenge has always been how to balance “richness and robustness” in his firms’ public spaces, and within them, the quieter gardens. He says public spaces must both be designed to hold up to crowds but also offer moments for introspection, for enjoying the plants:

“Embedded within the public’s desire for green parks is a desire for gardens. Public gardens cannot be fragile in their design or placement. Like the landscapes they inhabit, public gardens must be robust. They will not receive personalized maintenance, nor can they be subject to the overrunning pedestrian flows of large events or major gatherings. In addition to the selection of hardy plants and protection by slight grade separations or low barriers, the design of these gardens should be bold and somewhat simple, while retaining the very qualities that we enjoy so much—constant and changing colors, differing plant structures, and textures that change with the seasons or that carry the garden through winter. Gardens can inspire, provide refreshment, incite joy, or simply provide a provocative landscape context; as John Dixon Hunt wrote in regard to the landscape, ‘The garden is the highest aspiration of our culture.'”

Stanford University campus, California /
Stanford University campus, California / Kyle Jeffers

The book, however, doesn’t go into any details on how the firm has consistently overcome political, financial, and ecological obstacles to achieve those well-designed public spaces. A few brief case studies or interviews with clients could have given a glimpse into how Hargreaves has successfully navigated institutional and financial challenges. Still, Landscapes & Gardens is a thoughtful effort from one of the few truly global landscape architecture firms.