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7/29/2019 Module 6_DRA 2
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Basics ofDisaster Risk Assessment
Workshop
Training of Trainers on DRR/CCA for Local Partners
8 11 December 2012
Tagaytay City
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To characterize naturalhazards of the place
Objectives:1. Prepare an inventory
the hazards
2. Data needed
Hazard Characterization/
Frequency Analysis
Consequence Analysis
Risk Estimation
Risk Evaluation
Hazard Characterization
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Hazard CharacterizationHydrometeorologic Geological
Extreme rainfall
Tropical cycloneStorm surge
Thunderstorms
Flood
Drought
Rain-induced landslide
Ground subsidence
Coastal erosion
Earthquake
Ground shakingLiquefaction, subsidence
Landslides, debris flow
Fault rupture
Tsunami
Volcanic activities
Lava flow
Steam explosion
Ashfall
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Hazard Characterization
Main Causal Agent Hazard Data needs/source
Meteorological/ Hydrological Flood READY Project (1:50,000)PAGASA (1:????)
Exposure data:
- CBMS
- Tax map (assessor)
Damage curve
Replacement value
- DA for agri cost
- DPWH for infra
Hazard Inventory (sample table):
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Risk EstimationTo estimate risk per hazard
Objectives:1. Understand concepts
and procedures of risk
estimation
2. Estimate risk
Hazard Characterization/
Frequency Analysis
Consequence Analysis
Risk Evaluation
Risk Estimation
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Consequence Analysis
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Consequence Analysis
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Brgy LandArea(ha)
Population
(2010) PopulationDensityXU 198.20 3,375 17.03
MSU 498.28 3,267 ?DVO 656.18 2,173 ?
Consequence Analysis
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Brgy LandArea(ha)
Population
(2010) PopulationDensityXU 198.20 3,375 17.03
MSU 498.28 3,267 6.56DVO 656.18 2,173 3.31
Consequence Analysis
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Brgy LandArea(ha)
Population
(2010) PopulationDensityAffected area
HSA MSA LSAXU 198.20 3,375 17.03 - 198.20 -
MSU 498.28 3,267 6.56 - - 490.00DVO 656.18 2,173 3.31 - 50.00 606.18
Brgy Potentially Affected PopulationFrequent Likely Rare
XU ? ? ?MSU ? ? ?DVO ? ? ?
Consequence Analysis
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Brgy LandArea(ha)
Population
(2010) PopulationDensityAffected area
HSA MSA LSAXU 198.20 3,375 17.03 - 198.20 -
MSU 498.28 3,267 6.56 - - 490.00DVO 656.18 2,173 3.31 - 50.00 606.18
Brgy Potentially Affected PopulationFrequent Likely Rare
XU -- 3,375.00 3,375.00MSU -- -- 3,212.71DVO -- 165.58 2,173.00
Consequence Analysis
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Consequence Analysis
HSA
MSA
LSA
Estimate fatality/damage
FAP
affected
FP
FactorPopulationC
PAP FF Consequence
Frequent 1,400 0.001 1.40
Likely 3,500 0.002 7.00
Rare 7,000 0.003 21.00
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Brgy Potentially Affected Population Factors for FatalityFrequent Likely Rare Frequent Likely Rare
XU -- 3,375.00 3,375.00 - 0.000033 0.000066MSU -- -- 3,212.71 - 0.000033 0.000066DVO -- 165.58 2,173.00 - 0.000033 0.000066
Consequence Analysis
Brgy Consequence
Frequent Likely RareXU ? ? ?
MSU ? ? ?DVO ? ? ?
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Brgy Potentially Affected Population Factors for FatalityFrequent Likely Rare Frequent Likely Rare
XU -- 3,375.00 3,375.00 - 0.000033 0.000066MSU -- -- 3,212.71 - 0.000033 0.000066DVO -- 165.58 2,173.00 - 0.000033 0.000066
Consequence Analysis
Brgy Consequence
Frequent Likely RareXU -- 0.1114 0.2228
MSU -- -- 0.2120DVO -- 0.0055 0.1434
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Risk Estimation
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Brgy Return Period Risk EstimatesHSA MSA LSA Frequent Likely Rare
XU 5 10 50 ? ? ?MSU 5 10 50 ? ? ?DVO 5 10 50 ? ? ?
Brgy ConsequenceFrequent Likely Rare
XU -- 0.1114 0.2228MSU -- -- 0.2120DVO -- 0.0055 0.1434
Risk Estimation
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Brgy Return Period Risk EstimatesHSA MSA LSA Frequent Likely Rare
XU 5 10 50 -- 0.01114 0.00446MSU 5 10 50 -- -- 0.00424DVO 5 10 50 -- 0.00055 0.00287
Brgy ConsequenceFrequent Likely Rare
XU -- 0.1114 0.2228MSU -- -- 0.2120DVO -- 0.0055 0.1434
Risk Estimation
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and good day.