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Posts Tagged ‘GREEN ROOFS’

As part of an ongoing effort to make content more accessible, LAM will be making select stories available to readers in Spanish. For a full list of translated articles, please click here.

BY LISA OWENS VIANI

FROM THE NOVEMBER 2019 ISSUE OF LANDSCAPE ARCHITECTURE MAGAZINE.

 

Named for the walnut trees that used to line its banks, the Arroyo de los Nogales, a tributary of the Santa Cruz River, flows from south to north, descending from the high Sonoran desert in Mexico into Arizona. The main arroyo and its many smaller tributaries form a watershed, shaped roughly like a human heart, that is broken in two by the U.S.–Mexico border wall. Facing each other across the wall, in the river’s floodplain, are two cities, each named Nogales, that share social and environmental problems—including repeated flooding caused by rapid urbanization, ineffective flood control efforts, and the border wall itself.

Gabriel Díaz Montemayor, ASLA, an assistant professor of landscape architecture at the Fay Jones School of Architecture and Design at the University of Arkansas, and Francisco Lara-Valencia, an associate professor at the School of Transborder Studies at Arizona State University, have a greener vision for these border cities (together called Ambos Nogales), whose streets and arroyos often run brown with sediment and sewage in heavy storms. Díaz Montemayor and Lara-Valencia want to increase permeability throughout the watershed, slow peak flows in heavy storms, and develop more ecological connectivity between the two cities, despite the dividing presence of the wall.

They hope their ideas for an extensive network of green infrastructure can transform the way the cities develop, not only to improve water quality and flood management but also to provide more green space for residents. As the cities have grown, impervious surfaces have too, destroying natural areas. Both cities lack green space: There is just 1.1 square meter per person in Nogales, Mexico, and only 2.2 square meters per person on the U.S. side, Lara-Valencia says.

“We are not saying development shouldn’t happen,” Díaz Montemayor says. “We’re saying, ‘Let’s provide a structure for that development to happen [that] is based on natural systems.’” (more…)

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BY LISA OWENS VIANI

In Great Lakes cities, derelict parcels sponge up stormwater.

FROM THE AUGUST 2018 ISSUE OF LANDSCAPE ARCHITECTURE MAGAZINE.

Eight years ago, Sandra Albro, a research associate in applied urban ecology at the Cleveland Botanical Garden (now Holden Forests & Gardens) began to think about opportunities lurking in the city’s vacant lots—in particular how to help cities with their water quality problems. During heavy rains, raw sewage from old, leaky, combined sewer-stormwater systems is often flushed into the Great Lakes, resulting in beach closures not fun for tourists. At the same time, in Cleveland, Ohio; Buffalo, New York; and Gary, Indiana—where populations have declined by as much as 40 to 50 percent since the 1950s—derelict houses and vacant lots have increased: 30,000 in Cleveland, 7,000 in Gary, and more than 6,000 in Buffalo.

Cleveland, Buffalo, and Gary are among 158 communities with permits from the Environmental Protection Agency (EPA) to discharge treated wastewater into the Great Lakes. The agency has also charged them with implementing Long Term Control Plans under the Clean Water Act to eliminate discharges of untreated sewage from their combined system overflows. “It’s a funny thing,” says David Rankin, the executive director of the Great Lakes Protection Fund, a private nonprofit corporation that funds projects to build the health of the lakes. “Most of the time these systems do a great job of managing stormwater—they actually treat it. It was state-of-the-art Victorian engineering that dates back to the Industrial Revolution. But in heavy rains, some waste gets flushed out, too—and when you’re looking at more than 100 dischargers, it starts to add up.” According to the EPA, in 2014 the toll was an estimated 22 billion gallons of untreated wastewater discharged into the lakes.

Rankin says Great Lakes cities need to think differently about the problem—many are trying to find funding to build massive pipes. But with their populations declining, he suggests these cities should think about solutions that don’t involve tens or hundreds of millions of dollars. So when Albro came to him with her idea for using vacant lots to capture stormwater, the fund awarded her a small grant to develop a plan. She contacted 11 Great Lakes cities, (more…)

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