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

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