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Porto Alegre is the capital and largest city in the Brazilian state of Rio\udGrande do Sul in Southern Brazil with approximately 1.5 million inhabitants.\udThe city lies on the eastern bank of the Guaiba Lake, formed by the\udconvergence of five rivers and leading to the Lagoa dos Patos, a giant\udfreshwater lagoon navigable by even the largest of ships. This river\udjunction has become an important alluvial port as well as a chief industrial\udand commercial centre. However, this strategic location resulted in severe\uddamage because of its exposure to flooding from the river system, affecting\udthe city in the years 1873, 1928, 1936, 1941 and 1967. In order to reduce\udflood risk, a complex system of levees and pump stations was implemented\udduring 1960s and 1970s. Since its construction, not a single large flood event\udoccurred. However, in recent years, the levees in the downtown region of\udPorto Alegre were severally criticized by city planners and population.\udSeveral projects have been proposed to demolish the Mauá Wall due to the\udfalse perception of lack of flood risk. Similar opinions and reactions\udagainst flood infrastructure have been observed in other cities in Brazil,\udsuch as Itajaí and Blumenau, with disastrous consequences. This paper\udillustrates how the perception of flood risk in Porto Alegre has changed\udover recent years as a result of flood infrastructure, and how such changes\udin perceptions can influence water management decisions

Decreasing flood risk perception in Porto Alegre – Brazil and its influence on water resource management decisions