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Rotterdam Is Using Smart City Tech to Solve Pressing Urban Problems

on January 7, 2021 at 1:11 pm under , , , ,
Photo: The Toronto Star

About four-fifths of the Dutch port is below sea level. As Paul van Roosmalen, the city official overseeing sustainable public real estate, puts it: “The water comes from all sides” — the sea, the sky, the river and ground water. “It’s always been a threat.” But he also sees an opportunity to use a marriage of technology and green design to elevate the role of rooftops in managing Rotterdam’s water pressures.

“Instead of making bigger sewer pipes, we made a choice to invest in redesigning public space in a way that contributes to a nicer, better, more attractive district” Arnoud Molenaar
Rotterdam’s chief resilience officer

While typical green roofs function like sponges and look like gardens, Rotterdam is working with public and private landlords to develop a “green-blue grid.” Instead of simply fitting out roof areas with plantings, these spaces can also be equipped with reservoirs or tanks to retain excess flow — blue roofs. The tanks, in turn, are equipped with electronic drain valves that can be opened and closed remotely, in some cases via a smart phone app.

Van Roosmalen adds that a green roof can absorb about 15 millimetres of rain per square metre, whereas a roof with a reservoir can retain 10 times as much. The city’s goal is to convert one million square metres of flat roofs to include water retention systems and solar panels. Aggregated across even a portion of the city’s flat roofs, he says, “it’s a tremendous amount of water.”

Read more: Rotterdam is using smart city tech to solve pressing urban problems - Here’s what Canadian cities can learn from the Dutch model


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