“Know What to Do If You Encounter a Flash Flood”: Mental Models Analysis for Improving Flash Flood Risk Communication and Public Decision Making

Understanding how people view flash flood risks can help improve risk communication, ultimately improving outcomes. This article analyzes data from 26 mental models interviews about flash floods with members of the public in Boulder, Colorado, to understand their perspectives on flash flood risks and mitigation. The analysis includes a comparison between public and professional perspectives by referencing a companion mental models study of Boulder-area professionals. A mental models approach can help to diagnose what people already know about flash flood risks and responses, as well as any critical gaps in their knowledge that might be addressed through improved risk communication. A few public interviewees mentioned most of the key concepts discussed by professionals as important for flash flood warning decision making. However, most interviewees exhibited some incomplete understandings and misconceptions about aspects of flash flood development and exposure, effects, or mitigation that may lead to ineffective warning decisions when a flash flood threatens. These include important misunderstandings about the rapid evolution of flash floods, the speed of water in flash floods, the locations and times that pose the greatest flash flood risk in Boulder, the value of situational awareness and environmental cues, and the most appropriate responses when a flash flood threatens. The findings point to recommendations for ways to improve risk communication, over the long term and when an event threatens, to help people quickly recognize and understand threats, obtain needed information, and make informed decisions in complex, rapidly evolving extreme weather events such as flash floods.

[1]  Jörg Niewöhner,et al.  Evaluating the Efficacy of a Mental Models Approach for Improving Occupational Chemical Risk Protection , 2004, Risk analysis : an official publication of the Society for Risk Analysis.

[2]  Cynthia J. Atman,et al.  Designing risk communications , 1994 .

[3]  Igor Linkov,et al.  Flood Risk Management: US Army Corps of Engineers and Layperson Perceptions , 2012, Risk analysis : an official publication of the Society for Risk Analysis.

[4]  K. Krippendorff.  Reliability in Content Analysis: Some Common Misconceptions and Recommendations , 2004 .

[5]  Ann Bostrom,et al.  Lead is like mercury: risk comparisons, analogies and mental models1 , 2008 .

[6]  Céline Lutoff,et al.  How to get there? Assessing motorists' flash flood risk perception on daily itineraries , 2007 .

[7]  Gilbert F. White,et al.  Big Thompson Flood Exposes Need for Better Flood Reaction System to Save Lives , 1978 .

[8]  W. Falk.  Cultural Models of Pfiesteria : Toward Cultivating More Appropriate Risk Perceptions , 2000 .

[9]  B. Wynne.  Knowledges in Context , 1991 .

[10]  Ilan Kelman,et al.  An analysis of the causes and circumstances of flood disaster deaths. , 2005, Disasters.

[11]  Neil S. Grigg,et al.  Fort Collins Flood 1997: Comprehensive View of an Extreme Event , 1999 .

[12]  Walker S. Ashley,et al.  Flood Fatalities in the United States , 2008 .

[13]  M. Siegrist,et al.  Flooding Risks: A Comparison of Lay People's Perceptions and Expert's Assessments in Switzerland , 2006, Risk analysis : an official publication of the Society for Risk Analysis.

[14]  Ethan T Knocke,et al.  Flash Flood Awareness in Southwest Virginia , 2007, Risk analysis : an official publication of the Society for Risk Analysis.

[15]  T. Grothmann,et al.  People at Risk of Flooding: Why Some Residents Take Precautionary Action While Others Do Not , 2006 .

[16]  D G MacGregor,et al.  Perception of Risks from Electromagnetic Fields: A Psychometric Evaluation of a Risk-Communication Approach , 1994, Risk analysis : an official publication of the Society for Risk Analysis.

[17]  Kevin G. Stewart.  REVELATIONS FROM 21 YEARS OF PROVIDING FLASH FLOOD WARNING SUPPORT IN DENVER, COLORADO , 2001 .

[18]  B. Johnson.  Risk Communication: A Mental Models Approach , 2002 .

[19]  Eve Gruntfest,et al.  Risk factors for driving into flooded roads , 2007 .

[20]  S. Jonkman.  Global Perspectives on Loss of Human Life Caused by Floods , 2005 .

[21]  R. Wood,et al.  Mortality from flash floods: a review of national weather service reports, 1969-81. , 1983, Public health reports.

[22]  Heather Lazrus,et al.  Flash Flood Risks and Warning Decisions: A Mental Models Study of Forecasters, Public Officials, and Media Broadcasters in Boulder, Colorado , 2015, Risk analysis : an official publication of the Society for Risk Analysis.

[23]  Baruch Fischhoff,et al.  Evaluating Risk Communications: Completing and Correcting Mental Models of Hazardous Processes, Part II , 1994 .

[24]  P. Johnson-Laird.  Mental models , 1989 .

[25]  John Handmer,et al.  ‘Shelter-in-place’ vs. evacuation in flash floods , 2009 .

[26]  M. G. Morgan,et al.  What Do People Know About Global Climate Change? 1. Mental Models , 1994 .

[27]  Teun Terpstra,et al.  Perception and Communication of Flood Risks: A Systematic Review of Empirical Research , 2013, Risk analysis : an official publication of the Society for Risk Analysis.

[28]  A. Bostrom,et al.  Assessing what to address in science communication , 2013, Proceedings of the National Academy of Sciences.

[29]  Cees J. H. Midden,et al.  Prevention, Adaptation, and Threat Denial: Flooding Experiences in the Netherlands , 2009, Risk analysis : an official publication of the Society for Risk Analysis.

[30]  Ruud Zaalberg,et al.  Living Behind Dikes: Mimicking Flooding Experiences , 2013, Risk analysis : an official publication of the Society for Risk Analysis.

[31]  M. J. Quadrel,et al.  Risk perception and communication , 2008 .

[32]  M K Lindell,et al.  Effects of the Chernobyl accident on public perceptions of nuclear plant accident risks. , 1990, Risk analysis : an official publication of the Society for Risk Analysis.

[33]  Baruch Fischhoff,et al.  Characterizing Mental Models of Hazardous Processes: A Methodology and an Application to Radon , 1992 .

[34]  W. Botzen,et al.  A Review of Risk Perceptions and Other Factors that Influence Flood Mitigation Behavior , 2012, Risk analysis : an official publication of the Society for Risk Analysis.

[35]  M. Dekay,et al.  Predicting loss of life in cases of dam failure and flash flood. , 1993 .

[36]  G. Böhm,et al.  Causal thinking and support for climate change policies: International survey findings , 2012 .

[37]  M. Siegrist,et al.  The Role of the Affect and Availability Heuristics in Risk Communication , 2006, Risk analysis : an official publication of the Society for Risk Analysis.

[38]  P Slovic,et al.  The nature of technological hazard. , 1983, Science.

[39]  Baruch Fischhoff,et al.  Communicate unto others , 1998 .

[40]  S. Krimsky,et al.  Evaluating risk communication: narrative vs. technical presentations of information about radon. , 1992, Risk analysis : an official publication of the Society for Risk Analysis.

[41]  B Fischhoff,et al.  Designing risk communications: completing and correcting mental models of hazardous processes, Part I. , 1994, Risk analysis : an official publication of the Society for Risk Analysis.

[42]  Willett Kempton,et al.  Environmental Values in American Culture , 1995 .

[43]  Céline Lutoff,et al.  Social and Hydrological Responses to Extreme Precipitations: An Interdisciplinary Strategy for Postflood Investigation , 2014 .

[44]  Olga V. Wilhelmi,et al.  Improving Societal Outcomes of Extreme Weather in a Changing Climate: An Integrated Perspective , 2011 .

[45]  N A Connelly,et al.  Evaluating Risk Communication: Examining Target Audience Perceptions About Four Presentation Formats for Fish Consumption Health Advisory Information , 1998, Risk analysis : an official publication of the Society for Risk Analysis.

[46]  Michael Siegrist,et al.  Natural Hazards and Motivation for Mitigation Behavior: People Cannot Predict the Affect Evoked by a Severe Flood , 2008, Risk analysis : an official publication of the Society for Risk Analysis.

[47]  B. Fischhoff,et al.  COMMUNICATING RISK TO THE PUBLIC , 1992 .

[48]  R. Meertens,et al.  How Does the General Public Evaluate Risk Information? The Impact of Associations with Other Risks , 2007, Risk analysis : an official publication of the Society for Risk Analysis.

[49]  Klaus Wagner,et al.  Mental Models of Flash Floods and Landslides , 2007, Risk analysis : an official publication of the Society for Risk Analysis.

[50]  Elizabeth A. Casman,et al.  An Integrated Risk Model of a Drinking‐Water – Borne Cryptosporidiosis Outbreak , 2000, Risk analysis : an official publication of the Society for Risk Analysis.

[51]  B. Morrow,et al.  Vulnerability beyond Stereotypes: Context and Agency in Hurricane Risk Communication , 2012 .

[52]  Thomas W. Schmidlin,et al.  Vehicle‐related flood deaths in the United States, 1995–2005 , 2012 .

[53]  Anne Leitch,et al.  Mental models: an interdisciplinary synthesis of theory and methods , 2011 .

[54]  L B Lave,et al.  Public perception of the risks of floods: implications for communication. , 1991, Risk analysis : an official publication of the Society for Risk Analysis.