Posts tagged with "Flooding":
One might not expect Iowa City, a midsize heartland town of 70,000, to be on the forefront of urban sustainability issues. But Iowa City has everything to lose if climate change isn’t addressed. In 2008, a massive flood caused an estimated $64 billion in damage to the state, roughly equivalent to that caused by Hurricane Sandy. That flood was preceded by 239 tornados, which hit the Midwest over a nine-day period.
Iowa City, a UNESCO City of Literature, has a strong, culturally active citizenry, and now it is working to channel that energy into securing its environmental future. After the flood waters subsided, and the tornado damage was clear (damage from both of those events is still evident eight years later), a group of Iowa City residents began to seriously think about how design could be used to achieve a more sustainable urban center. “Ecopolis Iowa City” was organized to brainstorm urban restoration, biodiversity, local food, inclusionary and urban designs, renewable energy, and transportation initiatives for the future of the city. Initially holding informal meetings, Ecopolis Iowa City eventually started to sponsor forums that would use storytelling, music, and conversation to identify and generate ideas. From 2014 to 2016, the events eventually turned into a movement.
The city’s 2015 fall election saw a progressive council majority win for the first time in nearly 50 years. In spring 2016, Mayor Jim Throgmorton issued a “Regenerative City” proclamation. The proclamation set goals to “replant native prairies and trees to store carbon in the soils; expand urban agriculture; to power our city and neighborhoods efficiently through green building designs and renewable energy; to expand citywide recycling and composting through a zero waste ordinance; to make low-carbon transportation choices; to grow green jobs and support companies actively greening their operations.” By summer, the ideas from the Ecopolis Forums were worked into a proposed Iowa City Climate Action Plan.
The plan aims to expand and guide the regenerative city initiatives. Iowa City is already investing $60 million into raising a major route into the city above the 100-year flood level, but the plan calls for many more actions at different scales. From establishing protected “ecodistricts” to enforcing new sustainable building requirements, the plan may greatly affect the city’s future fabric. The plan sets greenhouse gas emission and transit diversity goals through 2030, with an eye on changing the way average citizens understand their impact on the environment.
Though the Iowa City Action Plan has not been formally adopted by the city, Ecopolis points out that the six million sandbags Iowa City residents filled to try and save their city in 2008 is a sign they are ready and able to make major changes. And with Ecopolis founders now on the city council, the time is better than ever.
This article was part of our Oct. 12 issue which focused on how water is shaping today’s landscape architecture and urbanism. Communities face deluges and droughts—for some, the stakes can be survival itself, but others see opportunities for decadence. To explore these stories from around the U.S. and the world, click here.
In terms of cities and climate change, Miami Beach is the biggest canary in the coal mine. At approximately four feet above sea level, this 19-square-mile strip of artificial and natural islands faces frequent flooding during storms and high tides. (Last September’s king tide—a colloquial term for high tide—reached 2.2 feet.)
The city is aggressively fighting the watery onslaught: Over the next five years, Miami Beach will spend $400 to $500 million in anti-flooding defenses that include pumps, raised roads, and seawalls.
This is money well spent. The Miami area sits on limestone that absorbs floodwaters and can force the deluge back to the surface, making flood control a special challenge. Still, environmental concerns aren’t stopping new developments across Miami. The economic timeframe for developers (and the residents buying and renting) remains relatively short compared to the long-term threat.
In addition to flooding, another, more insidious threat looms: Miami maintains its Biscayne Aquifer by channeling freshwater from Lake Okeechobee to push back against saltwater intrusion, which means the region may have to choose between flooding or drinking salt water. By 2060, some estimates place sea-level rise at three feet. Further down the line, questions of how federal and private insurers will provide flood coverage —and how eager banks will be to issue mortgages—may also arise.
It is by no means a simple problem to solve. Multiple licenses and approvals would be needed from a variety of agencies, including the city itself, the U.S. Environmental Protection Agency, and others. But there is great enthusiasm among experts for trying the experiment. Blue infrastructure is a key recommendation of the Detroit Future City visionary framework and has been much talked about in recent years, but nothing of this magnitude has been done so far in Detroit. So far, "blue infrastructure" in metro Detroit has meant the creation of porous parking lots and so-called "green alleys" that allow rain and snowmelt to filter down into the ground beneath instead of running off into sewers.Across the nation urbanists and landscape designers are embracing innovative stormwater capture and retention techniques as concerns over climate change, flooding and drought collide with a renewed interest in public spaces and site design.
Zinc and glass unite riverfront pavilion and pump house.In 2009, just as construction on its Principal Riverwalk pavilion was about to begin—and following years of funding-related stops and starts—Des Moines-based Substance Architecture received some unexpected news. The firm was commissioned to design a second building, a pump house, on an abutting plaza. At that point, recalled Substance's Paul Mankins, it had been about three years since the firm started work on the pavilion. "There was some discussion in the office about whether the pump house should be an independent piece, or whether it should be formally related to the pavilion," he said. "Our decision was that the pavilion would be stronger if it had this piece as a foil." Using a limited material palette of zinc and glass accented by Jun Kaneko's artwork, Substance succeeded in creating a dialogue between the two small riverfront buildings, despite their differing programs and dates of origin. The pavilion's form was shaped as much by practical circumstances as by a particular aesthetic vision. The Wallace Roberts and Todd (WRT) master plan for the Principal Riverwalk, a joint development of the City of Des Moines and the Principal Financial Group, determined the wedge shape of the site. "We're not a firm that typically does triangular buildings," noted Mankins, "but the inner workings of the floodwall were already in place before we started." The architects were further constrained by a tight budget. Rather than distribute the program across a single floor, said Mankins, "we were able to convince WRT to manipulate the plaza, tip it up to stack the program." The move cut the pavilion's footprint in half and allowed Substance to push the service functions down into the plaza itself, thus decreasing the cost of the envelope. The pavilion's focal element is its glass-enclosed cafe, stacked directly atop the cast-in-place concrete box housing the service functions. The architects created an outdoor seating area by pulling the building ten feet away from the floodwall. This gesture, too, was in part a pragmatic one, as it "eased conversations with the Army Corps of Engineers," said Mankins. "The end result produces an exterior terrace, which is fantastic. But it was not purely a design-driven decision; it was also a political decision." To mitigate solar gain, Substance shrouded the pavilion in folded black zinc that serves as both roof and wall. A broad overhang to the south provides shade in summer without sacrificing the view downriver. On the west side of the cafe, the zinc facade is louvered. "It's basically like an enormous blind with the fins oriented north," said Mankins. "It allows you to view directly north, which is upriver, unobstructed, but it blocks the western sun." The second project, the pump house, entered the mix following the flood of 2008. "We have a storm and sanitary sewer system that's cutting-edge technology for 1750," quipped Mankins. After two 500-year floods in less than two decades, the city decided it was high time to upgrade its flood management system. The pump station designed by Substance contains three pumps, one of which already existed. "There are other pump stations in Des Moines, typically just cinderblock walls around an emergency generator and several propeller pumps," explained Mankins. The architects took a different tack, echoing the neighboring pavilion with a two-part design. They encased the existing pump in translucent glass, then wrapped a triangular zinc wall around the two new pumps and associated components. Below the pump station's zinc walls, Substance used a type of Minnesota limestone deployed by WRT throughout the Principal Riverwalk development. Substance had already worked with artist Jun Kaneko on several pieces for the pavilion. The firm returned to ask for a final artwork, a multicolored glass mural. "When we were designing the pump station, we always wanted this glass mural," said Mankins. The designers collaborated with Kaneko and Germany's Derix Glasstudios on the mural itself, then engaged C3 Lighting Solutions and Commonwealth Electric to design and install an LED system for internal illumination. With the language of limestone uniting them with the rest of the Principal Riverwalk, said Mankins, the pavilion and pump station appear as "two objects placed on plazas formed by flood walls." Their relationship to one another is a (happy) marriage of opposites, thanks to the architects' strategic use of zinc and glass. "One is closed, the other open," said Mankins. "But they're clearly related to one another."
· Austin, Texas, will receive assistance to create design options to improve pedestrian and bike connections in the South Central Waterfront area, and to incorporate green infrastructure that reduces stormwater runoff and localized flooding, improves water quality, and increases shade. · Carson City, Nev., will receive assistance to improve William Street, a former state highway that connects to the city's downtown. The project will help the city explore how to incorporate green infrastructure through the use of native plants, and to enhance the neighborhood's economic vitality. · Columbus, Ohio, will receive assistance to develop design options for the Milo-Grogan neighborhood that use green infrastructure to improve stormwater quality, reduce flooding risks, and encourage walking and cycling. · Pierre, S.D., will receive assistance to redesign its historic main street, South Pierre, in a way that uses green infrastructure to reduce stormwater runoff and improve resiliency to extreme climate conditions. · Richmond, Va., will receive assistance to design options for more parks and open spaces, and to incorporate green infrastructure to better manage stormwater runoff on Jefferson Avenue, a street which serves as the gateway to some of Richmond's oldest and most historic neighborhoods.