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Posts Tagged ‘basins’

BY KAMILA GRIGO

Copenhagen’s stormwater detention roads are everything but.

FROM THE SEPTEMBER 2020 ISSUE OF LANDSCAPE ARCHITECTURE MAGAZINE.

 

As part of its climate change and urban flood mitigation strategy, Copenhagen aims to build 300 stormwater management projects over the next 20 to 30 years. Among the projects are a series of detention roads, entire streets redesigned to convey and detain rainwater locally to relieve the existing storm sewer system. It’s an ambitious target that reflects the city’s understanding that investment in these projects is a way of managing greater long-term risk to city infrastructure while providing citizens with multifunctional spaces in the short term.

The Sankt Kjelds Square and Bryggervangen by SLA is a pilot of the detention road concept. Completed in 2019, it comprises the entirety of the 2,300-foot-long Bryggervangen road and Sankt Kjelds Square, the roundabout in the middle. “It’s quite a simple project,” says Bjørn Ginman, a project director at SLA, who says that the fundamental concept is about seeing water move through the site. Rain gardens lining the pedestrian rights-of-way receive rainwater from sidewalks and the roofs of adjacent residential buildings, while road runoff is directed into larger infiltration ponds at the roundabout and at intersections, though not before an in-ground diverter (one of the municipality’s first applications in a public road context) deals with the most polluted first flush. (more…)

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BY MARGARET SHAKESPEARE

A sophisticated stormwater system elevates Philadelphia’s Girard Avenue interchange.

FROM THE NOVEMBER 2017 ISSUE OF LANDSCAPE ARCHITECTURE MAGAZINE.

Around the world, cities are demolishing, burying, or capping their elevated freeways, but an interstate in Philadelphia provides a possible alternative—one in which the highway stays up but connectivity, open space, and water quality are still prized. In redesigning three miles of Interstate 95 north of Center City Philadelphia, the Pennsylvania Department of Transportation planned 27 acres of park and open space, and the first phase of the $1 billion project, due for completion by 2027, incorporates examples of green infrastructure. According to AECOM, the prime consultant on the project, landscape design and green infrastructure accounted for between 5 and 7 percent of the first phase’s total budget.

At the Girard Avenue Interchange, I-95 runs parallel to the Delaware River two blocks away. Rather than whisking stormwater runoff directly into the river, overtaxing an already burdened municipal system, or funneling a deluge into a rock pit, AECOM and other experts devised a treatment scheme of basins, weirs, bioswales, and rain gardens. Ten planted acres can capture the first inch of runoff (more…)

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