Journal cover Journal topic
Proceedings of the International Association of Hydrological Sciences An open-access publication for refereed proceedings in hydrology
Journal topic

Journal metrics

Journal metrics

  • CiteScore value: 1.0 CiteScore
    1.0
  • SNIP value: 0.340 SNIP 0.340
  • IPP value: 0.67 IPP 0.67
  • SJR value: 0.301 SJR 0.301
  • Scimago H <br class='hide-on-tablet hide-on-mobile'>index value: 9 Scimago H
    index 9
  • h5-index value: 13 h5-index 13
Volume 370
Proc. IAHS, 370, 189–192, 2015
https://doi.org/10.5194/piahs-370-189-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Proc. IAHS, 370, 189–192, 2015
https://doi.org/10.5194/piahs-370-189-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

  11 Jun 2015

11 Jun 2015

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

D. G. Allasia1, R. Tassi1, D. Bemfica2, and J. A. Goldenfum3 D. G. Allasia et al.
  • 1Universidade Federal de Santa Maria, Federal University of Santa Maria, Master Courses in Civil and Environmental Engineering, Santa Maria, Brazil
  • 2Departamento de Esgotos Pluviais/Prefeitura Municipal de Porto Alegre, DEP/PMPA, Department of Rainwater Sewers/Municipality of Porto Alegre, Porto Alegre, Brazil
  • 3Instituto de Pesquisas Hidráulicas/Universidade Federal do Rio Grande do Sul, IPH/UFGRS, Institute of Hydraulic Research/Federal University of Rio Grande do Sul, Porto Alegre, Brazil

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

Publications Copernicus
Download
Short summary
Porto Alegre lies within a river junction that has become an important alluvial port as well as a chief industrial and commercial centre. This strategic location resulted in severe damage by flooding. Consequently a complex system of levees and pump stations was implemented during 1960s and 70s. In recent years, the levees were severally criticized by city planners and population due to the false perception of lack of flood risk as since its construction, not a single large flood event occurred.
Porto Alegre lies within a river junction that has become an important alluvial port as well as...
Citation