I’m standing in the middle of an unusual public square in Rotterdam. To my left is a drama school with an imposing concrete entrance and a sprawling plaza. To my right is a trio of large sunken squares, each ringed by a few steps.
On a regular day like today, these squares can be used as basketball and volleyball courts, skateboarding rinks, amphitheaters, or even ceremonies for the nearby church. But when it rains, the squares can fill up and hold up to 450,000 gallons of water.
The Water Square (Waterplein in Dutch) was designed by local urbanism and landscape architecture firm De Urbanisten. It was completed in 2013, and it marked a shift in the firm’s mission. Since then, the architects have researched water management issues in Mexico City; Antwerp, Belgium; and even New York City in the aftermath of Hurricane Sandy. They’ve built another water square in the Dutch town of Tiel, a sponge garden outside their office in Rotterdam, and now they’re working on two major projects elsewhere in Rotterdam: a tidal park that was designed to flood, and a climate-adaptive version of Manhattan’s High Line, complete with a water-purifying landscape.The studio’s work is particularly crucial in Rotterdam, much of which lies below sea level. But as climate change makes flash floods and extreme rainfall more likely across the globe, it offers a replicable model that extends far beyond the limits of the city.
Agate Kalnpure, an architect and landscape designer at the firm who took me on a tour of the sponge garden, says the garden isn’t connected to the city’s sewage system. Instead, it can collect and absorb stormwater without anyone having to water the plants. The concept can be scaled and replicated across a wild variety of urban scenarios, from residential gardens to landscaped strips alongside highways.
It will also increase flood resilience as the terraced, vegetated slope of the river bank can help break the waves when water levels are high. On a regular day, parts of the park would be accessible at low tide, helping reconnect citizens with the river and the renewed variety of animals that would be drawn to the underwater life.
This level of coexistence is important and suggests that public spaces can dodouble duty. A park can also provide a natural defense against floods, and a set of public squares can also act as rainwater storage.Back on the Water Square, the architects had to disconnect the plaza from the city’s sewage system. During flash floods, a network of oversize stainless steel gutters built into the pavement channel rainwater into the three ponds, then to an underground infiltration basin that filters pollutants and lets the water soak back up into the soil.
Wait a few years, and the Water Square will be part of a much larger network of public spaces and parks that will be linked by a green spine hovering above the city. Rotterdam’s version of the High Line is called Hofbogenpark, and it will sit on top of a 1.2-mile abandoned railway viaduct.Eventually, van Peijpe envisions, there will be something he calls a “rainwater cascade” scheme where rainwater would be collected and gradually absorbed at various points throughout the city—first on the roof, then through gardens surrounding the building, then on permeable surfaces along the sidewalk, and then through a variety of systems from water squares to sponge parks, until, finally, the water slowly seeps into the ground and disappears.
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