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Posts Tagged ‘impervious surfaces’

BY BRADFORD MCKEE

Gray infrastructure has given way to green to prevent sewer overflows into Washington, D.C.’s waters.

FROM “THE RIVER BENEATH THE RIVER,” IN THE NOVEMBER 2018 ISSUE OF LANDSCAPE ARCHITECTURE MAGAZINE.

 

Green infrastructure is now an important part of the Clean Rivers Project. The colossal Anacostia River tunnel remains a fixture in the effort on the east side of the city to hold and carry stormwater to DC Water’s Blue Plains Advanced Wastewater Treatment Plant. But to the west, the introduction of green infrastructure is allowing the elimination of one smaller tunnel for a combined sewer network above Rock Creek, which drains into the Potomac River, and the scaling back of another large tunnel along the Potomac itself.

The notion of complementing gray infrastructure with green was a priority of George Hawkins when he became general manager of DC Water in 2009. It was not an easy sell. Clean-water advocates were skeptical of green infrastructure’s performance capability and also feared delays in achieving the goals of the Clean Rivers Project—to end 96 percent of the District of Columbia’s combined sewer overflows. Hawkins was able to make a case for the efficacy of green infrastructure and also to show that significant improvements to water quality would occur well before the tunnels’ projected completion.

The Clean Rivers program is deploying a mix of bioretention, porous pavements, rain barrels, and downspout disconnection from combined sewers. In the Rock Creek sewershed, enough green infrastructure is planned to manage (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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BY ZACH MORTICE

The Lake Michigan coast, on the South Side of Chicago. Photo by Zach Mortice.

In 2014 alone, 22 billion gallons of untreated sewage and stormwater made its way into the Great Lakes, according to the Great Lakes Commission. On its way there, this stormwater degraded the rivers and streams it flowed through and caused flooding in areas where hard surfaces terminally halt its infiltration.

To deal with this regional calamity, the Great Lakes Commission and Lawrence Technological University have launched a new initiative to disseminate technology and techniques that can mitigate untreated stormwater pollution, the Great Lakes Stormwater Technology Transfer Collaborative.

This partnership between the Great Lakes Commission, a Michigan-based nonprofit that works to protect the ecology and economic health of the region in the United States and Canada, and Lawrence Tech’s Great Lakes Stormwater Management Institute will leverage the commission’s widespread industry contacts with the school’s technical expertise.  (more…)

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