How presentation format affects the interpretation of probabilistic flood risk information

Research output: Contribution to journalArticle

Abstract

In many European countries, flood awareness information is communicated through flood extent maps and probabilistic language. However, research suggests that probabilistic information is difficult to understand, and that presentation format affects understanding and risk perception. In this study, thirty participants participated in focus groups to explore responses to a flood extent map and completed a questionnaire to measure the effect of expressing the probability of flooding using different language formats on understanding and risk perception. Responses to the flood extent map reveal participants experienced difficulties interpreting the probabilistic information. In the questionnaire understanding was high across statements for both self-report and objective measures. However, the standard way of communicating risks, in terms of years per flooding event, evoked the lowest levels of understanding. For risk perception, there were differences in mean risk ratings across statements, and in general, people perceived the risk as greater when presented in terms of cumulative probability over a number of years, than in terms of the probability of a single event. This suggests that by making alterations to the standard format used to communicate probabilistic flood risk information it may be possible to increase understanding and awareness of the risks posed by flooding.
Original languageEnglish
Pages (from-to)87–96
Number of pages10
JournalJournal of Flood Risk Management
Volume10
Issue number1
Early online date17 Mar 2015
DOIs
Publication statusPublished - Mar 2017

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risk perception
flooding

Keywords

  • Risk
  • risk management
  • social

Cite this

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title = "How presentation format affects the interpretation of probabilistic flood risk information",
abstract = "In many European countries, flood awareness information is communicated through flood extent maps and probabilistic language. However, research suggests that probabilistic information is difficult to understand, and that presentation format affects understanding and risk perception. In this study, thirty participants participated in focus groups to explore responses to a flood extent map and completed a questionnaire to measure the effect of expressing the probability of flooding using different language formats on understanding and risk perception. Responses to the flood extent map reveal participants experienced difficulties interpreting the probabilistic information. In the questionnaire understanding was high across statements for both self-report and objective measures. However, the standard way of communicating risks, in terms of years per flooding event, evoked the lowest levels of understanding. For risk perception, there were differences in mean risk ratings across statements, and in general, people perceived the risk as greater when presented in terms of cumulative probability over a number of years, than in terms of the probability of a single event. This suggests that by making alterations to the standard format used to communicate probabilistic flood risk information it may be possible to increase understanding and awareness of the risks posed by flooding.",
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author = "Ailsa Strathie and Gina Netto and Walker, {Guy H} and Gareth Pender",
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How presentation format affects the interpretation of probabilistic flood risk information. / Strathie, Ailsa; Netto, Gina; Walker, Guy H; Pender, Gareth.

In: Journal of Flood Risk Management, Vol. 10, No. 1, 03.2017, p. 87–96 .

Research output: Contribution to journalArticle

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AU - Strathie, Ailsa

AU - Netto, Gina

AU - Walker, Guy H

AU - Pender, Gareth

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AB - In many European countries, flood awareness information is communicated through flood extent maps and probabilistic language. However, research suggests that probabilistic information is difficult to understand, and that presentation format affects understanding and risk perception. In this study, thirty participants participated in focus groups to explore responses to a flood extent map and completed a questionnaire to measure the effect of expressing the probability of flooding using different language formats on understanding and risk perception. Responses to the flood extent map reveal participants experienced difficulties interpreting the probabilistic information. In the questionnaire understanding was high across statements for both self-report and objective measures. However, the standard way of communicating risks, in terms of years per flooding event, evoked the lowest levels of understanding. For risk perception, there were differences in mean risk ratings across statements, and in general, people perceived the risk as greater when presented in terms of cumulative probability over a number of years, than in terms of the probability of a single event. This suggests that by making alterations to the standard format used to communicate probabilistic flood risk information it may be possible to increase understanding and awareness of the risks posed by flooding.

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