Paul Hockenos: Many American urban rivers are so polluted that swimming in them is illegal. Munich’s purified Isar River is a success to behold.
endeavor involved purifying the Isar’s waters, expanding its floodplains and modifying its banks to accommodate the torrential spring snowmelt.
Urban residents everywhere deserve the same opportunity. If cities around the world invest in cleaning up their waterways, they will create crucial lifelines to make the hottest months more bearable in environments hit disproportionately hard by global warming. Paved surfaces absorb heat, and buildings and narrow streets trap it, putting city populations more at risk than rural ones.
Munich and the state of Bavaria constructed 19 riverside purification stations along the Isar and its tributaries. The plants treat wastewater and during the most popular swimming months employ ultraviolet-light disinfection systems to reduce the water’s bacteria count. The river’s high, concrete-lined embankments were also demolished and replaced with grassy and pebbly expanses where floodwaters could ebb and flow unimpeded.
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