Flash Flood Risk Management â A Training of Trainers ... - ReliefWeb

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Flash Flood Risk Management – A Training of Trainers Manual Session 14 Hazard-Specific Flash Flood Management: Landslide Dam Outburst Floods Time: 60 minutes Session 14 Objective To introduce landslide dam outburst floods (LDOFs) and the measures that can be used to minimise the risks they pose, including: XX Types of landslides and the factors that trigger them XX Landslide dams and the factors that cause them XX How landslide dams fail XX Measures that can be used to reduce the risk of LDOF Activities Activity 14.1: Types of landslides and factors that trigger landslides Time: 15 minutes Step 1 Step 2 Step 3 Introduce the different types of landslides (e.g., fall, topple, slide, spread, and flow). Discuss what can cause landslides and their triggering factors. Discuss the causes and effects of the different types of landslides that can dam rivers. Activity 14.2: Process of landslide damming and factors that can cause landslide dams Time: 15 minutes Step 1 Step 2 Present and explain the process of landslide damming. Highlight the characteristics of possible places where landslides can dam a river. Discuss the factors that can cause a landslide to dam a river. Discuss the different possible compositions of landslide dams and how their composition affects their longevity. Discuss how landslide dams fail. Activity 14.3: Case studies of landslide dam outburst floods Time: 5 minutes Present and discuss landslide dam outburst floods and present the case studies described in RM 14.3. Discuss the causes of landslide dam outbursts. 90
Day 3 Activity 14.4: Measures that can reduce the risk of landslide dam outburst floods Time: 25 minutes Present and discuss control measures that can be used to minimise the risk of LDOFs. Focus on the following issues. Step 1 Landslide hazard assessment. Discuss the methods that can be used to identify places where hazards can occur such as landslide hazard mapping using GIS. Effective assessments focus on the places where a landslide is most likely to cause the greatest damage (e.g., narrow river valleys). Step 2 Step 3 Estimating downstream flooding. Discuss how the magnitude of a potential flood caused by a landslide dam outburst can be estimated in order to implement the appropriate mitigation measures downstream. (See example in RM 14.4.) Estimation of past floods. Discuss how the extent of past floods can be estimated and how this estimation can be used as the basis for assessing possible future hazard and risk. Review some flood estimation methods, such as methods to estimate velocity, depth, width, and discharge. (See examples in RM 14.4.) Session 14 Step 4 Step 5 Land use regulations. Discuss land use practices particularly in flood prone and landslide prone areas. Engage the class in a short question and answer session, asking the participants to suggest some land use regulations that can help to minimise the risk of landslide dams. Early warning systems. Explain how early warning systems can be effective in mitigating the harmful effects of outburst floods, particularly in saving lives and property. 91
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Flash Flood Risk Management A Train
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Published by International Centre f
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Foreword The Hindu Kush-Himalayan (
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Acronyms and Abbreviations CFFRMC D
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Flash Flood Risk Management - A Tra
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Introduction Day 1 Session/Activity
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Day 1 Suggestions for the facilitat
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Day 1 Suggestions for the facilitat
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Day 1 Session 2 Flash Flood Hazards
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Day 1 Session 2 Resource Materials
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Day 1 RM 2.4: Flash floods in the H
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Day 1 in flash floods during the pe
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Day 1 Activity 3.2: Identifying the
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Day 1 Figure 4: Categorisation of f
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Day 1 Session 4 Flash Flood Hazard
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Day 2 Session/Activity Session 5: V
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Day 2 Activity 5.2: Flash flood ris
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Day 2 In a physically vulnerable zo
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Day 2 Step 2 Show the short video o
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Page 61 and 62: Day 2 Session 8 Gender Perspectives
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Page 87 and 88: Day 3 their livelihoods. Watershed
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Page 93 and 94: Day 3 where Q = discharge A = area
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