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LESSONS LEARNED FROM PAST NOTABLE DISASTERS
INDIAPART 1: FLOODS
(NOTE: FLOODS ALSO TRIGGER LANDSLIDES)
Walter Hays, Global Alliance for Disaster Reduction, Vienna, Virginia, USA
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INDIA
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NATURAL AND TECH. HAZARDS THAT HAVE NATURAL AND TECH. HAZARDS THAT HAVE CAUSED DISASTERS IN INDIACAUSED DISASTERS IN INDIA
NATURAL AND TECH. HAZARDS THAT HAVE NATURAL AND TECH. HAZARDS THAT HAVE CAUSED DISASTERS IN INDIACAUSED DISASTERS IN INDIA
FLOODS (LANDSLIDES)
SEVERE WINDSTORMS
EARTHQUAKES
POWER BLACKOUTS
ENVIRONMENTAL CHANGE
GLOBAL CLIMATE CHANGE
HIGH BENEFIT/COST FROM BECOMING DISASTER RESILIENT
HIGH BENEFIT/COST FROM BECOMING DISASTER RESILIENT
GOAL: PROTECT PEOPLE GOAL: PROTECT PEOPLE AND COMMUNITIESAND COMMUNITIES
GOAL: PROTECT PEOPLE GOAL: PROTECT PEOPLE AND COMMUNITIESAND COMMUNITIES
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Natural Phenomena that Cause Disasters
Planet Earth’s atmospheric-hydrospheric-lithospheric interactions create situ-ations favorable for FLOODS
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CAUSES OF NOTABLE FLOODS IN INDIA: THE
ANNUAL MONSOON RAINS
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A “HIMALAYAN TSUNAMII” HIMALAYAN REGION OF
NORTHEST INDIA(Floods also trigger landslides)
June 24—JULY ??, 2013
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Triggered by unusually heavy monsoon rains that don’t
usually arrive this early in the mountainous state of
Uttarakhand, which borders Nepal and China, the floods and landslides swept away
buildings, roads and vehicles.
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HIGH POTENTIAL LOSS EXPOSURES IN A FLOOD
Entire villages:
People, property, infra-structure, business enterprise, government centers, crops, wildlife, and natural resources.
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Kedarnath, the home of a deeply revered Hindu
temple visited by many pilgrims every year,
experienced the maximum devastation.
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KEDARNATH (Note: Temple in Foreground)
KEDARNATH (Note: Temple in foreground)
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RISHIKESH: HINDU STATUE
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PARTS OF NEW DEHLI ALSO FLOODED
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IMPACTS
• At least 1,000 feared dead
• 70,000 evacuated
• More than 50,000 people cut off by the waters
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DEVASTATING FLOODS IN ASSAM STATE AND IN NORTHEST INDIA(Floods also trigger landslides)
June 28—JULY 15, 2012
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The Brahmaputra River overflowed during monsoon
rains, flooding more than 2,000 villages and
destroying homes in the northeast of the country
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FLOOD: ASSAM STATE; JUNE 28, 2012
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WILD BUFFALO GOING TO HIGHER GROUND; JUNE 28
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STRANDED IN NAELENI VILLAGE: JUNE 28
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STRANDED
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SOME OF THE 500,000 EVACUEES: JUNE 29
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ELDERLY AND YOUNG EVACUEES: JUNE 29
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HOMELESS BULUT VILLAGE FAMILY: JUNE 30
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PUMPING DRINKING WATER: BULUT VILLAGE; JUNE 30
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2012: RECORD BREAKING IMPACTS
Ninety-five dead Over 2 million homeless. Half a million evacuees are living in relief
camps with disease prone conditions Damaging landslides hindered relief
operations
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NEEDED: FLOOD DISASTER RESILIENCE
NEEDED: FLOOD DISASTER RESILIENCE
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INDIA’SINDIA’S
COMMUNITIESCOMMUNITIES
INDIA’SINDIA’S
COMMUNITIESCOMMUNITIESDATA BASES DATA BASES AND INFORMATIONAND INFORMATIONDATA BASES DATA BASES AND INFORMATIONAND INFORMATION
HAZARDS: GROUND SHAKING GROUND FAILURE SURFACE FAULTING TECTONIC DEFORMATION TSUNAMI RUN UP AFTERSHOCKS
•FLOOD HAZARDS•PEOPLE & BLDGS. •VULNERABILITY•LOCATION
FLOOD RISK FLOOD RISK
RISK
ACCEPTABLE RISK
UNACCEPTABLE RISK
GOAL: FLOOD DISASTER GOAL: FLOOD DISASTER RESILIENCERESILIENCE
• PREPAREDNESS•PROTECTION•EARLY WARNING•EMERGENCY RESPONSE•RECOVERY and RECONSTRUCTION
POLICY OPTIONSPOLICY OPTIONS
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A FLOOD RISK ASSESSMENT HELPS GUIDE POLICY
ADOPTION AND IMPLEMENTATION FOR
FLOOD DISASTER RESILIENCE
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DAMAGE FROM DAMAGE FROM INUNDATIONINUNDATION
DAMAGE FROM DAMAGE FROM INUNDATIONINUNDATION
A FLOOD RISK ASSESSMENT INTEGRATES PHYSICAL A FLOOD RISK ASSESSMENT INTEGRATES PHYSICAL EFFECTS AND SOCIETAL IMPACTS TO DETERMINE EFFECTS AND SOCIETAL IMPACTS TO DETERMINE
RISKRISK
A FLOOD RISK ASSESSMENT INTEGRATES PHYSICAL A FLOOD RISK ASSESSMENT INTEGRATES PHYSICAL EFFECTS AND SOCIETAL IMPACTS TO DETERMINE EFFECTS AND SOCIETAL IMPACTS TO DETERMINE
RISKRISK
EROSION, SCOUR, AND EROSION, SCOUR, AND LANDSLIDESLANDSLIDES
EROSION, SCOUR, AND EROSION, SCOUR, AND LANDSLIDESLANDSLIDES
LOSS OF LOSS OF FUNCTIONFUNCTIONLOSS OF LOSS OF FUNCTIONFUNCTION ECONOMIC LOSSECONOMIC LOSSECONOMIC LOSSECONOMIC LOSS
RISKRISKRISKRISK
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LOSS OF FUNCTION OF STRUCTURES IN FLOODPLAIN
FLOODSFLOODS
INUNDATION
INTERACTION WITH HAZARDOUS MATERIALS
STRUCTURE & CONTENTS: DAMAGE FROM WATER
WATER BORNE DISEASES (HEALTH PROBLEMS)
EROSION AND MUDFLOWS
CONTAMINATION OF GROUND WATER
CAUSES OF RISK
CAUSES OF RISK
DISASTER LABORATORIES
DISASTER LABORATORIES
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FLOOD DISASTER RISKSFLOOD DISASTER RISKS
LOSS OF FUNCTION OF BUILDINGS AND INFRASTRUCTURE, RELEASE OF
HAZARDOUS MATERIALS, DAMAGE TO CONTENTS, TRANSPORTATION OF DEBRIS,
AUTOS, AND HOUSES, ENVIRONMENTAL DEAD ZONES, AND WATER BORNE
DISEASES
LOSS OF FUNCTION OF BUILDINGS AND INFRASTRUCTURE, RELEASE OF
HAZARDOUS MATERIALS, DAMAGE TO CONTENTS, TRANSPORTATION OF DEBRIS,
AUTOS, AND HOUSES, ENVIRONMENTAL DEAD ZONES, AND WATER BORNE
DISEASES
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A RISK ASSESSMENT
• A risk assessment involves the probabilistic integration of:
• The hazard (e.g., floods) and their potential disaster agents (inundation, erosion, etc) that are directly related to the location of the community and what happens in the regional water cycle.
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RISK ASSESSMENT (Continued)
• The location of each element of the exposure in relation to the physical demands of the hazard (i.e., inundation, etc.)
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RISK ASSESSMENT (Continued)
• The exposure (e.g., people, and elements of the community’s built environment), represents the potential loss when the natural hazard occurs.
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RISK ASSESSMENT (Continued)
• The vulnerability (or fragility) of each element comprising the exposure when subjected to the potential disaster agents.
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UNDERSTANDING VULNERABILITY: THE
ULTIMATE DRIVER OF RISK
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Vulnerability: The Driver of Risk Vulnerability: The Driver of Risk Vulnerability: The Driver of Risk Vulnerability: The Driver of Risk
FLOOD FLOOD
HAZARDSHAZARDS
FLOOD FLOOD
HAZARDSHAZARDS
EVENTEVENT
VULNERABILITYVULNERABILITY
PEOPLESTRUCTURESPROPERTYENVIRONMENTINFRASTRUCTURE
EXPOSUREEXPOSURE
EXPECTED EXPECTED
LOSSLOSS
EXPECTED EXPECTED
LOSSLOSS
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An element’s vulnerability (fragility) is the result of a community’s actions or of
nature’s actions that change some part of the regional water
cycle (e.g., precipitation, storage, runoff, transpiration,
evaporation).
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WHAT INCREASES VULNERABILITY
MANKIND’S ACTIONS AND NATURE ITSELF CAN CHANGE THE VULNERABILITY OF
ELEMENTS AT RISK TO A FLOOD, A PART OF THE REGIONAL WATER CYCLE
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MANKIND’S CONTRIBUTIONAn element’s vulnerability
(fragility) is the result of flaws that enter during the planning,
location, siting, design, and construction of a community’s buildings and infrastructure.
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MANKIND’S ACTIONS THAT CHANGE SOME PART OF THE WATER CYCLE
• Urban development or industrial development in areas that were formerly wetlands.
• Locating buildings and infrastructure in a river floodplain.
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MANKIND’S ACTIONS THAT CHANGE SOME PART OF THE WATER CYCLE
• Actions that increase or decrease river gradients (deforestation, dams, etc).
• Actions that change the runoff rate or pattern (e.g., the city’s concrete footprint)
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NATURE’S ACTIONS THAT CHANGE THE WATER CYCLE
• A flash flood.• Ice jams/ice dams on the river• Rapid melt of snow and ice• Extreme or prolonged
precipitation caused by stalled low-pressure weather systems.
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REQUIRED INFORMATION FOR A COMPREHENSIVE
VULNERABILITY ASSESSMENT
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REQUIRED INFORMATION
• Physical characteristics of the regional water cycle and drainage system.
• Physical characteristics of each river system, its tributaries, and its floodplains.
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REQUIRED INFORMATION
• Physical characteristics of catchment basins, reservoirs, and wetlands in the region.
• Physical characteristics of dikes, levees, and dams controlling water discharge and flooding potential in the region.
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REQUIRED INFORMATION
• The hazardous materials and other elements located in the floodplain.
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LOSS OF FUNCTION OF STRUCTURES IN FLOODPLAIN
FLOODSFLOODS
INUNDATION
INTERACTION WITH HAZARDOUS MATERIALS
STRUCTURAL/CONTENTS DAMAGE FROM WATER
WATER BORNE DISEASES (HEALTH PROBLEMS)
EROSION AND MUDFLOWS
CONTAMINATION OF GROUND WATER
CAUSES OF DISASTER
CAUSES OF DISASTER
CASE HISTORIESCASE HISTORIES
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A DISASTER is ---
--- the set of failures that overwhelm the capability of a community to respond without external help when three continuums: 1) people, 2) community (i.e., a set of habitats, livelihoods, and social constructs), and 3) complex events (e.g., floods, earthquakes,…) intersect at a point in space and time.
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Disasters are caused by single- or multiple-event natural hazards that, (for various reasons), cause
extreme levels of mortality, morbidity, homelessness,
joblessness, economic losses, or environmental impacts.
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THE REASONS ARE . . .
• When it does happen, the functions of the community’s buildings and infrastructure can be LOST for long periods.
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THE REASONS ARE . . .
• The community is UN-PREPARED for what will likely happen, not to mention the low-probability of occurrence—high-probability of adverse consequences event.
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THE REASONS ARE . . .
• The community has NO DISASTER PLANNING SCENARIO or WARNING SYSTEM in place as a strategic framework for early threat identification and coordinated local, national, regional, and international countermeasures.
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THE REASONS ARE . . .
• The community LACKS THE CAPACITY TO RESPOND in a timely and effective manner to the full spectrum of expected and unexpected emergency situations.
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THE REASONS ARE . . .
• The community is INEFFICIENT during recovery and reconstruction because it HAS NOT LEARNED from either the current experience or the cumulative prior experiences.
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POLICY POLICY ADOPTIONADOPTION
POLICY POLICY ADOPTIONADOPTION
RISK ASSESSMENT
• VULNERABILITYVULNERABILITY
• EXPOSUREEXPOSURE
• EVENTEVENT
POLICY ASSESSMENT
• COSTCOST
• BENEFITBENEFIT
•CONSEQUENCESCONSEQUENCES
MOVING TOWARDS FLOOD DISASTER MOVING TOWARDS FLOOD DISASTER RESILIENCERESILIENCE
FLOODSFLOODSFLOODSFLOODS EXPECTED EXPECTED LOSSLOSS
EXPECTED EXPECTED LOSSLOSS
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LESSONS LEARNED ABOUT DISASTER RESILIENCE
ALL FLOODS PREPAREDNESFOR THE EXPECTED AND UNEXPECTED IS ESSENTIAL FOR DISASTER RESILIENCE
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LESSONS LEARNED ABOUT DISASTER RESILIENCE
ALL FLOODS
EARLY WARN-ING (THE ISS) AND EVACU-ATION ARE ESSENTIAL FOR DISASTER RESILIENCE
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LESSONS LEARNED ABOUT DISASTER RESILIENCE
ALL FLOODS TIMELY EMERGENCY RESPONSE IS ESSENTIAL FOR DISASTER RESILIENCE
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LESSONS LEARNED ABOUT DISASTER RESILIENCE
ALL FLOODS
RECOVERY AND RECON-STRUCTION USUALLY TAKES LONG-ER THAN THOUGHT.