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The entrance to the Argenta Hills commercial development in Inver Grove Heights, Minn., features a landscaped median that doubles as a stormwater collection area.
Elizabeth Dunbar | MPR News
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With its Target store and mix of single family homes, Argenta Hills looks like any typical suburban tract. But it's anything but typical when it rains.
Instead of traditional gutters and catch basins, the Inver Grove Heights development has cuts in the curb for stormwater to flow into rain gardens where plants soak it up. Part of the massive Target parking lot and some road intersections are porous, allowing water to seep into the ground. For bigger storms, low-lying basins collect the excess and prevent flooding.
You won't find another like it in Minnesota. It's as if the whole area is one giant rain garden spanning more than 3,000 acres because when it rains, all the water stays on site. There are no underground pipes to carry it away to the Mississippi River.
"I don't think people even recognize that that's stormwater treatment," said Brett Emmons, an engineer with Emmons and Olivier Resources, which helped design the system.
MPR News helps you turn down the noise and build shared understanding. Turn up your support for this public resource and keep trusted journalism accessible to all.
A rain garden at the Argenta Hills development collects rainwater from the Target parking lot. Rather than constructing stormwater ponds and a series of pipes and pumps to carry the water away from the site, engineers used green infrastructure and low-lying basins to create a system that can handle even the largest storms.
Elizabeth Dunbar | MPR News
Many Minnesota cities use rain gardens and other "green infrastructure" now to keep stormwater from polluting nearby lakes and rivers. But they're often small, neighborhood efforts. Inver Grove Heights, however, is putting that stormwater science to use on a massive scale at Argenta Hills, and it's attracting national attention.
It was one of eight engineering projects this year to receive top awards from the American Council of Engineering Companies. Others included fancy transit stations in Denver and New York City and an earthquake-proof bridge in the San Francisco Bay area.
Emmons says in its first five years, the system is performing better than expected, showing green infrastructure's potential.
"This is kind of almost hidden or woven into the site in a way that isn't so obvious but it does its job, at the same time it can be attractive," he said. "This site and this whole area of Inver Grove Heights is proof that it can have a major, major impact."
While the Inver Grove Heights project may be the biggest, the Twin Cities metropolitan area boasts stormwater projects that are equally ambitious.
On University Avenue in St. Paul, for instance, the storm drains look pretty normal, but they're not. They've been re-engineered.
Mark Doneux, administrator of the Capitol Region Watershed District, stands next to one of the stormwater planters the district has constructed along side streets near University Avenue in St. Paul, Minn., on July 20, 2015. The planters, paid for with Legacy Amendment money, help reduce the amount of polluted rainwater sent through the cityas stormwater system and into the Mississippi River. The watershed district also added a tree trench system along University Avenue to reduce runoff by over 50 percent along a portion of the new light rail line.
Elizabeth Dunbar | MPR News
"Before, all the rain would just come right down to this catch basin and into a pipe and go straight to the river," Mark Doneux of the Capitol Region Watershed District explained on a recent street tour. "What happens now along this stretch of University Avenue is these catch basins are actually going into a rock trench that feed the roots of the trees."
About 1,000 trees line several miles of University Avenue, helping reduce the area's stormwater runoff by over 50 percent. Doneux said that's as high as they could get in an area that's fully developed with the existing buildings and a new light rail line.
These aren't novelty science projects. Experts say climate change is forcing city leaders and engineers across Minnesota to find ways to manage what happens when it rains.
For instance, a typical once-in-a-decade storm drops about 4.5 inches now, but the rainfall in those storms could rise 33 percent by 2050, swamping storm sewers that weren't built for it, said John Gulliver, a civil engineering professor at the University of Minnesota's St. Anthony Falls Laboratory.
But replacing the pipes shouldn't be the first solution, said Gulliver, who has researched green infrastructure for more than a decade.
"There are situations where green infrastructure can alleviate the need to replace the storm sewer," he said. "It's expensive to dig up the street, so it's possible you could even save money if you do it with green infrastructure."
He acknowledged that in most existing urban areas, green infrastructure won't replace storm sewers because there isn't enough open space to capture the biggest storms.
A new subdivision in the Argenta Hills development in Inver Grove Heights, Minn., is perched above green space where stormwater is allowed to soak into the ground rather than being routed by pipes to a stream or river.
Elizabeth Dunbar | MPR News
That wasn't a problem in Argenta Hills. Inver Grove Heights Public Works Director Scott Thureen says the development might not have happened at all without the innovative stormwater system. The area is far from a stream or river where water could be discharged, and people balked at the estimate for a conventional system of pipes and pumps.
"It got everybody's attention, and property owners who had already been talking to developers were coming back saying that price is too high," he said.
In the end, that conventional system, including the required maintenance over the years, would have been twice the cost of the system the city adopted. With the green engineering, the area can handle back-to-back "100-year" storms as well as a rapid, sizable snow melt, he added.
The Argenta Hills Target in Inver Grove Heights, Minn., has a parking lot partially made of pervious pavement, which allows water to seep into the ground, as it did on July 16, 2015. The pavement costs more than traditional surfaces but can allow developers to use fewer pipes to take stormwater away.
Elizabeth Dunbar | MPR News
Green isn't always cheaper. Permeable pavement, for example, can cost two to three times as much as traditional surfaces, though the cost has been coming down. So cities are trying to be strategic about where and when they adopt the practices. In most cases, it's when they're adding a new development or reconstructing an existing area.
While the data are still coming in on how much green infrastructure can improve a lake or river, Minnesota's urban areas need to think about rainwater differently, said Anne Gelbmann, who coordinates green infrastructure efforts at the Minnesota Pollution Control Agency.
The agency now gives first preference to practices in stormwater permit applications that keep that dirty, urban stormwater brew out of lakes and rivers, she said, adding, "I would really like to see people think of rain as a resource and not just something we have to get rid of."