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

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Flash Flood Risk Management – A Training of Trainers Manual RM 4.2: Methods of hazard analysis and assessment The different scenarios of flash flood hazard can be analysed using various methods and tools and the findings can be presented in the form of hazard maps. Modern technology has advanced hazard mapping and the prediction of possible events considerably through techniques such as geological mapping and satellite imagery, high resolution mapping, and computer modelling. Geographic information system (GIS) mapping techniques, in particular, are revolutionising the process of preparing hazard maps. Computer-based modelling techniques and community-based hazard mapping techniques are the cornerstones of hazard analysis. Even more reliable results can be achieved when the two methods are combined and the results are substantiated through field verification. Hazard analysis is directed at understanding the intensity of the flood hazard, the strength of potential flash floods, and the scenarios for the catchment. The intensity of the hazard is determined by estimating the degree of the anticipated flooding. Generally, the degree of intensity is classified as high, moderate, moderately low, or low (Table 2). After estimation of the degree of the intensity of the potential hazard, the hazard probability level is assigned. The probability of flash flooding is based on the return period of the flood. If the return period is short, the probability of hazard is high and vice versa. It is relatively straightforward to assign a return period or frequency when the flooding is caused by rainfall. However, it is often difficult to assign a probability level to flash flood events such as LDOFs and GLOFs, as they occur infrequently and are seldom repeat events. In such cases, it is customary to use probability levels based on the characteristics of the lake, dam, or surrounding environment. The characteristics of the surroundings are determined qualitatively. As in the case of the degree of intensity, the four levels of hazard probability are high, moderate, moderately low, and low. session 4 Assessing hazard consists of considering both the intensity of the potential hazard and its probability. Figure 6 shows an example of a hazard-level scale. Both the hazard probability and the degree of hazard intensity have four levels (high, moderate, moderately low, low). The resulting 16-cell hazard-level scale identifies four hazard levels: very high, high, moderate, and low. Table 2: A simple way of assigning hazard intensity Hazard intensity Danger to population close to the stream Danger to population in settlement (about 500 m from the stream) Danger to population 1 km away from the stream High yes yes yes yes Moderate yes yes yes no Moderately Low yes yes no no Low yes no no no Danger to population more than 1 km away from the stream Figure 6: Hazard-level scale Probability level Moderately Moderate low High Low Hazard level Hazard intensity High Moderate Moderately low Low Very high High Moderate Low 30
Day 2 Session/Activity Session 5: Vulnerability and Flash Flood Risk Assessment Activity time (minutes) Cumulative time of session 5.1 Methods of vulnerability assessment 60 60 5.2 Flash flood risk assessment 30 90 Session 6: Local Knowledge on Disaster Management 6.1 6.2 6.3 Concept of local knowledge and its role in disaster management How to identify and document local knowledge related to disaster management Advantages and limitations of local knowledge in disaster management 35 35 15 50 15 65 6.4 Methods of transferring scientific knowledge to the community 10 75 Session 7: Community-Based Flash Flood Risk Management 7.1 Importance of community level flash flood risk management 10 10 7.2 Process of community participation in flash flood risk management 20 30 7.3 Structure, responsibilities, and empowerment of the CFFRMC 15 45 7.4 Characteristics of good community governance 05 50 7.5 Role of government in community flash flood risk management 10 60 Session 8: Gender Perspectives in Disaster Management 8.1 Concept of gender and gender differences 10 10 8.2 Gender and flash flood risk management 15 25 8.3 Gender-sensitive flash flood risk management 20 45 Session 9: Social Hazard Mapping and Risk Assessment 9.1 Concept and importance of social hazard mapping 10 10 9.2 Process of social hazard mapping 35 45 9.3 Process of participatory GIS mapping (PGIS) of hazards 15 60
Page 1: Flash Flood Risk Management A Train
Page 4 and 5: Published by International Centre f
Page 6 and 7: Foreword The Hindu Kush-Himalayan (
Page 8 and 9: Acronyms and Abbreviations CFFRMC D
Page 10 and 11: Flash Flood Risk Management - A Tra
Page 12 and 13: Flash Flood Risk Management - A Tra
Page 15 and 16: Introduction Day 1 Session/Activity
Page 17 and 18: Day 1 Suggestions for the facilitat
Page 19 and 20: Day 1 Suggestions for the facilitat
Page 21 and 22: Day 1 Session 2 Flash Flood Hazards
Page 23 and 24: Day 1 Session 2 Resource Materials
Page 25 and 26: Day 1 RM 2.4: Flash floods in the H
Page 27 and 28: Day 1 in flash floods during the pe
Page 29 and 30: Day 1 Activity 3.2: Identifying the
Page 33 and 34: Day 1 Figure 4: Categorisation of f
Page 35 and 36: Day 1 Session 4 Flash Flood Hazard
Page 37: Day 1 Session 4 Resource Materials
Page 41 and 42: Day 2 Activity 5.2: Flash flood ris
Page 43 and 44: Day 2 In a physically vulnerable zo
Page 45 and 46: Day 2 Step 2 Show the short video o
Page 47 and 48: Day 2 Session 6 Handouts Handout 6.
Page 49 and 50: Day 2 Figure 8: The four pillars of
Page 51 and 52: Day 2 • As a result of rapid cha
Page 53 and 54: Day 2 Session 7 Community-Based Fla
Page 55 and 56: Day 2 Step 4 Step 5 Discuss the dif
Page 57 and 58: Day 2 Figure 10: Framework for comm
Page 59 and 60: Day 2 • First-aid and health: Th
Page 61 and 62: Day 2 Session 8 Gender Perspectives
Page 63 and 64: Day 2 The CFFRMC also plays a role
Page 65 and 66: Day 2 Note to the trainer Clarify t
Page 67 and 68: Day 2 groups such as people with di
Page 69 and 70: Day 2 RM 9.3: Process of participat
Page 71 and 72: Day 3 Session/Activity Activity tim
Page 73 and 74: Day 3 Activity 10.3: Strategies for
Page 75 and 76: Day 3 RM 10.2: Various strategies f
Page 77 and 78: disseminated. The South Asian tsuna
Page 81 and 82: Day 3 Geospatial Stream Flow Model
Page 83 and 84: Day 3 Activity 12.2: Concept and co
Page 85 and 86: Day 3 perspective means looking for
Page 87 and 88: Day 3 their livelihoods. Watershed
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Day 3 Session 13 Hazard-Specific Fl
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Day 3 Session 13 Resource Materials
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Day 3 where Q = discharge A = area
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Day 3 There are two types of routin
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Day 3 Box 13: Exercise on flood rou
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Day 3 Activity 14.4: Measures that
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Day 3 Figure 15: Types of landslide
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Day 3 occurs). In most documented c
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Day 3 Figure 21: Tsatichhu landslid
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Day 3 Estimating downstream floodin
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Day 3 Strand (1977) uses the same e
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Day 4 Session/Activity Session 15:
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Day 4 Session 16 Hazard-Specific Fl
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Day 4 Session 16 Resource Materials
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Day 4 Figure 25: Development of the
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Day 4 RM 16.3: Impacts of GLOF even
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Day 4 Supra or englacial drainage.
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Day 4 Briefing for the Field Trip T
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Days 5, 6, and 7 Field Trip
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Flash Flood Risk Management - A Tra
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