Rotterdam in the Netherlands is the largest port in Europe. This 800-year-old city, which has a population of 630,000, is split into north and south sides by the River Nieuwe Maas. While the river is a major asset, it also increases vulnerability to climate change as sea levels rise. In a session at the ASLA 2018 Annual Meeting in Philadelphia, Dutch government officials, landscape architects, and planners discussed efforts to adapt Rotterdam and the rest of Holland to new realities.
After flooding in the early 1950s killed some 1,800 people, the Dutch were determined this would never happen again. According to Tim Van Der Staaij, a resilience officer with the Rotterdam city government, the country created a multi-layered system of “delta works” — a series of dikes, polders, and sluices to defend land against water. This system made Rotterdam, most of which is 6-7 meters below sea level, and its port possible.
But in recent years, climate change has made the intricate system that protects Rotterdam vulnerable. Van Der Staaij said the water management system has become “more unpredictable due to sea level rise, river discharge, groundwater rise, and excess rainfall.”
Given the city is already below sea level, Rotterdam has taken the approach that “we must accept the water; it’s better than fighting.” Once that conclusion was reached, city leaders saw an opportunity to redesign the city as part of a new Rotterdam resilience strategy, a set of “holistic, multi-level, multi-stakeholder” approaches.
In the past few years, the Dutch have invented new ways to “accept water,” including the water square by landscape architecture firm De Urbanisten, which is usually a public plaza with basketball court, but in extreme rain events becomes a temporary water storage space that “holds the water while the sewage system is over-taxed and then lets the water go later.”
Van Der Staaij said the city is now working on redesigning all public spaces to store water, including the new central station now in development. As part of this, Rotterdam has invested heavily in putting all that water to good use through its “water sensitive city” program, which invests in green roofs, tree planting, street-level gardens, and new green “tidal parks” along the river.
Han Dijk, an urban planner working with the city on its resilience plans, highlighted the tidal parks along the Nieuwe Maas — also to be designed by De Urbanisten — as central to creating a Rotterdam that can bounce back from repeated flooding. “The city will build new land with fill, soften the river’s coasts, and open up and connect islands.”
And Gerda Roeleveld, a landscape architect with Deltares, a independent research institute, explained how the Netherlands has invested in 3D simulated models to help local policymakers, planners, and designers — as well as the general public — understand the potential impacts of climate change.
She showed off some sophisticated animations that visualize climate impacts, including the distribution of water — from the national to the site-levels. A set of these adaptation support tools, based in real-time data, are supporting Dutch communities in their efforts to devise new climate resilience and adaptation strategies, which they obligated to create by 2019.