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Flash Flood Risk Management – A Training of Trainers Manual Figure 20: a) Bhairabkunda Khola a few days after the LDOF; b) debris deposited by the LDOF; c) large boulders trapped at the highway bridge; d) Larcha village destroyed by the flash flood a b Session 14 c d Source: NR Khanal RM 14.3: Case studies of landslide dam outburst floods Case 1: The Budhi Gandaki and Larcha Khola landslide dam outburst flood In recent memory, the Budhi Gandaki River in Nepal was twice dammed near Lukubesi (Shrestha et al. 2008). In 1967, the river was dammed for three days after slope failure at Tarebhir. Another landslide in 1968 again dammed the river with a huge amount of displaced material. After the landslide dam was breached, the water level rose by 14.61 m. The peak flow was estimated to be 5,210 m 3 /sec, which is significantly higher than the mean annual instantaneous flood (2,380 m 3 /sec). After the breach, one bridge and 24 houses were swept away at Arughat Bazaar which is located about 22 km downstream from the damming site (Figure 20). The Bhairabkunda Khola (river) was dammed in 1996. The subsequent landslide dam outburst flood destroyed 22 houses and killed 54 people in Larcha village. The highway bridge was swept away by the flash flood. Case 2: The Tsatichhu landslide dam outburst flood Another example of an LDOF in the HKH region is the Tsatichhu LDOF in Bhutan (Shrestha et al. 2008) (Figure 21). On 10 September 2003, material with an estimated volume of 7–12 x 10 6 m 3 failed on the wall of a valley and slid into the Tsatichhu River. The tremor cause by the landslide was felt as far away as Ladrong village some 2.5 km away. According to the inhabitants of nearby areas, the main slide occurred over a period of 30 minutes. The slide formed a river-blocking dam 110 m high. The deposited material had an estimated volume of 10–15 x 10 6 m 3 . The dam crest extended approximately 580 m across the valley (Dunning et al. 2006), and the deposited material spread a distance of 200 m upstream and 700 m downstream. 96
Day 3 Figure 21: Tsatichhu landslide dam: a) the area at the source of the landslide; b) detailed view of the dam; c) Tsatichhu Lake a Session 14 b c Source: Dunning et al. (2006) 97
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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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Day 2 Session 6 Handouts Handout 6.
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Day 2 Figure 8: The four pillars of
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Day 2 • As a result of rapid cha
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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
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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 79 and 80: Day 3 Session 11 Resource Materials
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 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
Page 117 and 118: Day 4 Figure 25: Development of the
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
Page 125: Days 5, 6, and 7 Field Trip
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