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Insured Flood Damages: Lake 
floods and pluvial flooding 
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
Tonje Grahn, Karlstad University, 
Centre for Climate & Safety, Sweden 
Please add your 
logo here
Damages reported to Länsförsäkringar insurance 
25,000 
20,000 
15,000 
10,000 
5,000 
Monthly distribution of reported damages 1987- 
2013 
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
company 1987-2013 
0 
1 2 3 4 5 6 7 8 9 10 11 12 
6,000 
5,000 
4,000 
3,000 
2,000 
1,000 
0 
Reported damages 1987-2013
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
Analysis- Pluvial flooding 
• 17 rainy days in 4 Swedish citys was 
included in a regression analysis 
• 1400 observations 
• Daily precipitation varies between 10 
mm and 110 mm 
• A positive significant relationship 
between the size of damage cost and 
amount of daily precipitation was 
established 
• Even small and moderate amounts 
can cause severe damage
80 mm rainfall in the same city on two seperate dates. Rainfall in the left 
picture resulted in 15 refundable claims, rainfall in the right picture resulted 
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
in 900 refundable claims
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
Municipality of Arvika
Municipality of Arvika: Red dots: Pluvial flood damage. Blue dots: Lake flood 
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
damage
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
Analysis- Lake flood 
• Lake Vänern (5650 km2) & 
Lake Glafsfjorden (94 km2) 
• Total of 200 observations, micro 
level 
• 50 % of damaged property 
situated in a fringe area not 
reached by surface water 
• Slow build up 
• Long duration (several months) 
• Private damage reducing actions 
lower the probability structural 
building damage 
Lake Vänern 
Yellow dots: damges property in a 
fringe area. 
Blue dots: reached by surface water
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
Summary 
• Number of damages reported to Swedish insurance companies has increased 
during the past 25 years 
• The overall cost of insured flood damages in Sweden has increased during the 
past 25 years 
• The slow rise of lake water levels enable private damage reducing measures to 
be taken 
• Even simple private actions lowers the risk of extensive building damage 
• Despite a few large lake flood incidents, the main part of Swedish flood 
damages occur during the Swedish summer when intense rainfall is common 
• There is a significant positive relationship between daily precipitation and 
insurance payments 
• Damages do occur at small and moderate amounts of precipitation
Added value for the Post 2015 Framework for 
5th International Disaster and Risk Conference IDRC 2014 
‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland 
www.grforum.org 
Disaster Risk Reduction 
• How did your work support the implementation of the Hyogo 
Framework for Action: 
– Contributing to the process of identifying and assessing risk by 
collecting data and performing statistical analysis of loss information 
• From your perspective what are the main gaps, needs and 
further steps to be addressed in the Post 2015 Framework for 
Disaster Risk Reduction in 
– Collection of data and quantitative analysis of data at the micro level, 
more interdisciplinary science and transdisiplinary collaboration in 
order to create understanding between sciences and generate 
methods and results applicable to real life situations

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T.GRAHN Davos 2014

  • 1. Insured Flood Damages: Lake floods and pluvial flooding 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org Tonje Grahn, Karlstad University, Centre for Climate & Safety, Sweden Please add your logo here
  • 2. Damages reported to Länsförsäkringar insurance 25,000 20,000 15,000 10,000 5,000 Monthly distribution of reported damages 1987- 2013 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org company 1987-2013 0 1 2 3 4 5 6 7 8 9 10 11 12 6,000 5,000 4,000 3,000 2,000 1,000 0 Reported damages 1987-2013
  • 3. 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org Analysis- Pluvial flooding • 17 rainy days in 4 Swedish citys was included in a regression analysis • 1400 observations • Daily precipitation varies between 10 mm and 110 mm • A positive significant relationship between the size of damage cost and amount of daily precipitation was established • Even small and moderate amounts can cause severe damage
  • 4. 80 mm rainfall in the same city on two seperate dates. Rainfall in the left picture resulted in 15 refundable claims, rainfall in the right picture resulted 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org in 900 refundable claims
  • 5. 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org Municipality of Arvika
  • 6. Municipality of Arvika: Red dots: Pluvial flood damage. Blue dots: Lake flood 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org damage
  • 7. 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org Analysis- Lake flood • Lake Vänern (5650 km2) & Lake Glafsfjorden (94 km2) • Total of 200 observations, micro level • 50 % of damaged property situated in a fringe area not reached by surface water • Slow build up • Long duration (several months) • Private damage reducing actions lower the probability structural building damage Lake Vänern Yellow dots: damges property in a fringe area. Blue dots: reached by surface water
  • 8. 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org Summary • Number of damages reported to Swedish insurance companies has increased during the past 25 years • The overall cost of insured flood damages in Sweden has increased during the past 25 years • The slow rise of lake water levels enable private damage reducing measures to be taken • Even simple private actions lowers the risk of extensive building damage • Despite a few large lake flood incidents, the main part of Swedish flood damages occur during the Swedish summer when intense rainfall is common • There is a significant positive relationship between daily precipitation and insurance payments • Damages do occur at small and moderate amounts of precipitation
  • 9. Added value for the Post 2015 Framework for 5th International Disaster and Risk Conference IDRC 2014 ‘Integrative Risk Management - The role of science, technology & practice‘ • 24-28 August 2014 • Davos • Switzerland www.grforum.org Disaster Risk Reduction • How did your work support the implementation of the Hyogo Framework for Action: – Contributing to the process of identifying and assessing risk by collecting data and performing statistical analysis of loss information • From your perspective what are the main gaps, needs and further steps to be addressed in the Post 2015 Framework for Disaster Risk Reduction in – Collection of data and quantitative analysis of data at the micro level, more interdisciplinary science and transdisiplinary collaboration in order to create understanding between sciences and generate methods and results applicable to real life situations