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Flash Flood Risk Management – A Training of Trainers Manual Session 10 Resource Materials RM 10.1: Measures for flash flood risk management and the importance of non-structural measures Flash flood risk management includes both structural and non-structural measures. Structural measures tend to deal with the hydraulic and hydrological implications of flooding. Structural measures can include, river training, building embankments, constructing reservoirs and dams and other works aimed at controlling the flow of water to reduce the flood hazard. Non-structural measures work by using a different set of strategies, such as risk tolerance, risk prevention, and risk mitigation. The range of possibilities for these encompasses a wide diversity of measures such as: land use planning, devising and enforcing construction and structure management codes, soil management, land acquisition policies, insurance, sensitising the population through perception and awareness campaigns, disseminating information, as well as putting in place systems for emergency and post-disaster preparedness. A combination of structural and non-structural measures yields the best results. Strategies for flash flood risk management are given in Table 6. Non-structural measures Non-structural measures are very important when dealing with settled areas. Compared to structural measures, non-structural measures tend to be more sustainable because they include the active involvement of the community. National and regional policies tend to favour non-structural alternatives since these are low cost and have fewer environmental side effects; expensive structural measures with potentially serious environmental repercussions are considered as only a last resort. There are two categories of non-structural measures: risk acceptance and risk reduction measures. session 10 Table 6: Structural and non-structural measures for flash flood risk management Structural measures Catchment-wide interventions (agriculture, forestry, and water control activities) River training interventions Other flood control interventions (passive control, water retention basins and river corridor enhancement, rehabilitation and restoration) Non-structural measures Risk Acceptance Tolerance Strategies Toleration Emergency response system Insurance Risk Reduction Watershed management Prevention Strategies Delimitation of flood areas and securing flood plains Implementation of flood areas regulation Application of financial measures Reduction of discharge through natural retention Mitigation Strategies Emergency action based on monitoring, warning, and response systems (MWRS) Public information and education Source: Colombo et al. (2002) 66
Day 3 RM 10.2: Various strategies for flash flood risk acceptance Acceptable risk, as defined in the United Nations International Strategy for Disaster Reduction, is the level of loss that a society or community considers acceptable within the given existing social, economic, political, cultural, technical, and environmental conditions (UNISDR 2009). There are three main types of risk acceptance strategies: toleration, emergency response systems, and insurance. Toleration Toleration of risk implies that a competent authority (local, regional, or national) accepts that flash floods can occur. In this case, it is very likely that the competent authority will accept the results of the risk assessment and not promote any activities to reduce the risk. Emergency response systems All emergency plans (regional, district, local) should be based on a national emergency plan so that emergency operations within a particular country will be carried out according to the same doctrine of civil protection and in a concerted manner. In general, the various public authorities implicated in the emergency plan will play roles related to their day-to-day responsibilities. They must prepare themselves according to the mission statement established in the emergency plan. To this end, each competent authority (regional, district, local) should have its own emergency plan, accompanied by an operations manual. Insurance Insurance against flash flood damage should be an integral part of risk acceptance. However, many countries in the HKH region still do not have this practice because of the high costs involved. Insurance companies have various policies that cover risk. Insurance policies that apply only at the local level are far too expensive both for the insurance companies and for the private and public subscribers. RM 10.3: Various strategies for flash flood risk reduction Risk reduction is one of the main goals in flash flood management. It can be dealt with in two ways: through prevention strategies and through mitigation strategies. Prevention strategies Watershed management. (See also Session 12.) Watershed management has both structural and nonstructural components. Watershed management is cross-cutting and closely related both to the socio-economic status of the community and its development. Watershed management takes into consideration a number of basic principles related to runoff and erosion including soil, topography, land cover and use, farming practices, and floodplain zoning. This topic is covered in more detail later in the section on watershed management and the integrated flash flood management approach. session 10 Financial measures. Financial support can be provided after a flash flood occurs in order to aid communities in dealing with the aftermath of the disaster. Usually this aid is administered through national or regional agencies. Financial measures can be • an economic contribution or the waiver of a financial burden such as: taxes, loan interest, or the liquidation of a loan; • financial support to individuals and local communities for planning, constructing, and maintaining structural interventions that can be shared among national, provincial, and local administrative levels, with the total amount divided among them (the share of the burden generally increasing progressively from local to provincial to national level); • support to maintain and regulate hydraulic works of public interest (where the support is given to those who maintain it); 67
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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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Page 35 and 36: Day 1 Session 4 Flash Flood Hazard
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Page 43 and 44: Day 2 In a physically vulnerable zo
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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
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Page 69 and 70: Day 2 RM 9.3: Process of participat
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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
Page 89 and 90: Day 3 Session 13 Hazard-Specific Fl
Page 93 and 94: Day 3 where Q = discharge A = area
Page 95 and 96: Day 3 There are two types of routin
Page 97 and 98: Day 3 Box 13: Exercise on flood rou
Page 99 and 100: Day 3 Activity 14.4: Measures that
Page 101 and 102: Day 3 Figure 15: Types of landslide
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Page 105 and 106: Day 3 Figure 21: Tsatichhu landslid
Page 107 and 108: Day 3 Estimating downstream floodin
Page 109 and 110: Day 3 Strand (1977) uses the same e
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Page 113 and 114: Day 4 Session 16 Hazard-Specific Fl
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Page 119 and 120: Day 4 RM 16.3: Impacts of GLOF even
Page 121 and 122: Day 4 Supra or englacial drainage.
Page 123 and 124: Day 4 Briefing for the Field Trip T
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Days 5, 6, and 7 Field Trip
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