Flood Risk Assessment And Management:
A Case Study In Rio De Janeiro
Author(s)
M. G. Miguez, A. P. Veról & L. Bianchini
Abstract
Developing countries suffer with the growth of the so-called irregular cities. The
lack of basic infrastructure and the inadequate urban growth management lead to
urban flood problems. The concept of risk combines the probability of a hazard
event with the consequences inflicted to a system. Thus, there are several
possibilities of acting in flood risk mitigation: reducing the hazard and/or the
system vulnerability. In this context, both structural measures and non-structural
measures may be used. Traditional structural measures frequently were
associated with river canalisation, dykes and dams. In the last past decades, the
concepts of sustainable drainage systems have arisen, tending to control onsource
runoff generation. Storage and infiltration measures are planned to
diminish the impact of the urbanisation process on the hydrological cycle. Flood
mapping, land use regulation and flood proofing constructions appear in this
context as non-structural measures. More recently, the concept of river
restoration appeared as an alternative. Rivers in more natural conditions and
associated with a responsible land use tend to produce an environment with
minor risks. In this context, this paper will discuss flood risks related to an urban
environment and the choices related with the attempts to mitigate the problem.
The Flood Risk Index (FRI), developed by Zonensein et al. (2008) is used to
support a quantitative comparison of different design solutions. A case study
concerning Mesquita City, in the metropolitan region of Rio de Janeiro, Brazil, is
developed. The urban occupation of the city is very dense, with few open spaces
and degraded areas. In the overall assessment, river restoration concepts,
although limited by the built environment, produced a minor flood risk index,
when compared with a traditional alternative.
Keywords: flood risk, risk assessment, river restoration.
Keywords
flood risk, risk assessment, river restoration
Related Book
Other papers in this volume
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