Better Urban Design Can Help Curb Flooding
Given the new normal, it is time to rethink our approach to floods. The right infrastructure can prevent flooding, rather than treat it after the fact.
A Changing Climate Means A Changing Society. The Island Press Urban Resilience Project, Supported By The Kresge Foundation And The JPB Foundation, Is Committed To A Greener, Fairer Future. This Op-Ed Was Originally Published September 24, 2018 In The Progressive.
Over the course of four days in mid-September, Hurricane Florence dumped a record-breaking 34 inches of rain on Swansboro, North Carolina — a city that usually gets 57 inches in an entire year.
In 2017, Hurricane Harvey caused the worst flood in Houston’s history. In 2012, flooding from Superstorm Sandy — considered a once-in-700-year event — devastated coastal New York and New Jersey.
These and other events are typically called natural disasters. But overwhelming scientific consensus says they are actually the result of human-induced climate change and irresponsible construction in flood-prone areas.
Most scientists agree that global warming is causing sea levels to rise, while increasing the frequency, intensity, and duration of extreme weather events. At the same time, the rapid urbanization of coastal areas is putting more people and property in harm’s way.
Given this new normal, it is time to rethink our approach to floods. We typically deal with only the symptoms of the problem, by evacuating residents before a disaster, housing them temporarily in emergency shelters, and paying insurance so that they can rebuild afterward.
But this is tremendously costly, both in human and financial terms.
Moody’s Analytics has tallied at least $17 billion in property damage from Florence so far. Harvey cost $125 billion and the tally for Maria in Puerto Rico is $139 billion. Katrina destroyed $161 billion in property.
Fortunately, the right infrastructure can prevent flooding, rather than treat it after the fact. Prevention is cost-effective: The National Institute of Buildings Services estimates that every dollar spent on the reduction of a community’s vulnerability to disasters saves approximately $6 in economic losses.
As an architect and urban designer working on large-scale projects, as well as a native of the Netherlands, a low-lying country that wouldn’t exist without flood-management infrastructure, I have been intrigued by recent, innovative solutions to flood prevention.
For example, the beach town of Cleveleys, in England, chose not to build a standard concrete seawall, which has all the charm of a military bunker and can block human access to the shore.
Instead, the city built a structure with amphitheater-like viewing spaces and steps. The steps accentuate the beautiful curvilinear shapes, while creating access to the beach and adding public space, which is important for a coastal town that relies on tourists.
Flood protection can even be integrated into buildings. The Dutch coastal town Katwijk aan Zee integrated a levee with a parking garage, and covered it with landscaping. In Rotterdam, levees include built-in shops and parks. This type of infrastructure has economic benefits beyond flood protection.
Finally, some of the best solutions rely on an ancient flood protection device: dune grass, a saltwater tolerant plant that stabilizes dunes and prevents erosion. In contrast to reinforced concrete defenses that take the full force of waves until they are worn away by the sea, dunes absorb the waves’ velocity, while beautifying the landscape and providing habitats.
By marrying flood management with creative urban and landscape design, infrastructure can become a strategic civic asset. In addition, it can pay for itself by unlocking the real estate and economic development potential of newly protected areas. The new normal of flooding and sea-level rise poses great challenges, but it also offers opportunities to improve our urban areas and landscapes.
#ForewordFriday: Urban Transformations Edition
Cities across the globe have been designed with a primary goal of moving people around quickly—and the costs are becoming ever more apparent. The consequences are measured in smoggy air basins, sprawling suburbs, a failure to stem traffic...
Cities across the globe have been designed with a primary goal of moving people around quickly—and the costs are becoming ever more apparent. The consequences are measured in smoggy air basins, sprawling suburbs, a failure to stem traffic congestion, and 1.25 million traffic fatalities each year. It is clear that change is needed. Instead of planning primarily for mobility, our cities should recalibrate planning and design to focus on the safety, health, and access of people in them.
Beyond Mobility is about prioritizing the needs and aspirations of people and the creation of great places. Authored by three experts in the field, including global transportation authority Robert Cervero, the book shows how a stronger focus on accessibility and place creates better communities, environments, and economies. Examples range from car-free districts in Cambridge, England, to suburban transformations in Tysons, VA, to urban greenways and land reclamation in Seoul, South Korea. Jan Gehl, author of Cities for People, praised the book, saying: “This veritable tour de force will be an inspiration and resource for anyone who cares about the future of cities.”