08/30/2026
Back at work today, looking at how Copenhagen deals with stormwater - and the rain added a little extra to understanding how it flows, eddies, delays, impounds… and then releases into the harbour. Since the 1990s, the city has transformed its water from a polluted sink into water so clean everyone can swim. Yesterday was the 20th Copenhagen Swim, where people can do a lap through the harbour (2km) or go on for 5 or 10km. A record 6,000 swimmers participated! And what has clean water done for the economy? So much redevelopment, new housing, young people staying after university, families moving here for the great quality of life. Not to mention, the huge influx of corporations and tourism. Clean water? Priceless… and it all starts well upstream from its final outfall.