Rotterdam is a city overflowing, both with stormwater and with climate adaptation strategies. Rotterdam is in seemingly constant need of stormwater storage, reflected in the city’s climate resilience strategy. The Waterplein Benthemplein, part of Rotterdam’s first “climate-proof” district, is a floodable water square that kickstarted climate-smart urban design in the rest of the ZoHo neighborhood (short for Zomerhofkwartier). In combination with new initiatives to decrease hard, paved surfaces, green building façades, and collect rainwater on rooftops and in gardens, Rotterdam is making itself into a “sponge.”Together, amphitheater-style seating and open play spaces allow the square to fill up with water through a system of stainless steel gutters, which is then conveyed to the city’s open water system.