Unit 5: Disaster management - Subjective Questions

Disaster: A disaster is a serious disruption that causes widespread human, material, economic, or environmental losses beyond the affected community's ability to cope using its own resources.

Major phases of the disaster management cycle:

• Prevention: Measures taken to avoid the occurrence of a disaster wherever possible, such as restricting construction in hazardous areas.
• Mitigation: Actions that reduce disaster severity, such as earthquake-resistant construction and flood-control embankments.
• Preparedness: Planning, training, early-warning systems, evacuation drills, and stockpiling essential supplies.
• Response: Immediate activities such as search and rescue, evacuation, emergency medical care, shelter, and relief distribution.
• Recovery: Restoration of essential services, livelihoods, infrastructure, and normal community life.
• Rehabilitation and reconstruction: Long-term rebuilding that follows the principle of Build Back Better to reduce future risk.

These phases are interconnected and together create a continuous process of disaster risk management.

Classification of natural disasters:

• Water-related disasters: Floods, flash floods, droughts, and storm surges.
• Air-related disasters: Cyclones, hurricanes, tornadoes, thunderstorms, and severe storms.
• Earth-related disasters: Earthquakes, landslides, avalanches, volcanic eruptions, and tsunamis.
• Biological natural hazards: Epidemics, pest attacks, and naturally emerging diseases.

Factors determining severity:

• Magnitude and intensity of the hazardous event.
• Duration and speed of onset, such as a sudden earthquake compared with a slowly developing drought.
• Population exposure in the affected area.
• Vulnerability caused by poverty, weak buildings, environmental degradation, or poor health services.
• Preparedness and response capacity of the community and government.
• Geographical conditions, including slope, drainage, soil type, and proximity to coasts or fault lines.

A natural hazard becomes a disaster when it affects an exposed and vulnerable population that lacks sufficient capacity to cope.

Causes of floods:

• Intense or prolonged rainfall.
• Overflow of rivers and reservoirs.
• Cyclones, storm surges, and rapid snowmelt.
• Dam or embankment failure.
• Deforestation, wetland destruction, and soil erosion.
• Urbanization, blocked drains, and construction on floodplains.

Effects:

• Death, injury, displacement, and loss of livestock.
• Destruction of houses, crops, roads, bridges, and communication systems.
• Contamination of drinking water and outbreaks of water-borne diseases.
• Soil erosion, sediment deposition, and damage to ecosystems.
• Economic losses and disruption of education and livelihoods.

Management measures:

• Flood forecasting and timely warnings.
• Floodplain zoning and control of unsafe construction.
• Maintenance of drains, embankments, dams, wetlands, and watershed vegetation.
• Evacuation routes, raised shelters, rescue teams, and emergency supplies.
• Post-flood sanitation, medical care, damage assessment, and resilient reconstruction.

A drought is an extended period of abnormally low rainfall that produces water scarcity. It is called a slow-onset disaster because its effects develop gradually and may persist for months or years.

Types of drought:

• Meteorological drought: Rainfall is significantly below the long-term average.
• Agricultural drought: Soil moisture becomes insufficient for crops.
• Hydrological drought: Rivers, reservoirs, lakes, and groundwater levels decline.
• Socio-economic drought: Water shortage disrupts the supply of food, energy, and essential goods.

Major effects: Crop failure, livestock loss, malnutrition, migration, unemployment, land degradation, forest fires, and conflicts over water.

Mitigation strategies:

• Rainwater harvesting and watershed management.
• Efficient irrigation methods such as drip and sprinkler irrigation.
• Cultivation of drought-resistant crops and crop diversification.
• Groundwater regulation and restoration of ponds and wetlands.
• Drought monitoring, seasonal forecasting, crop insurance, and food reserves.
• Public awareness, water conservation, and livelihood support for affected communities.

Floods and droughts are both water-related disasters, but they represent opposite hydrological extremes.

Both hazards are intensified by climate variability, environmental degradation, unplanned development, and weak resource management. Integrated watershed and land-use planning can reduce the risks of both.

Formation of a tropical cyclone:

• It generally forms over warm ocean water with a temperature above approximately .
• Warm, moist air rises and creates a low-pressure region.
• Condensation releases latent heat, strengthening upward air movement.
• Surrounding air moves inward and begins rotating because of the Coriolis effect.
• Under favorable conditions, the system develops an eye, eyewall, and spiral rain bands.

Impacts:

• Destructive winds damage buildings, power lines, crops, and communication networks.
• Storm surges inundate coastal settlements and contaminate freshwater.
• Heavy rainfall causes floods and landslides.
• Fishing, transport, agriculture, and local livelihoods are disrupted.

Management measures:

• Satellite monitoring, cyclone tracking, and clear early warnings.
• Coastal shelters, evacuation plans, and marked evacuation routes.
• Wind-resistant buildings and protection of critical infrastructure.
• Mangrove and coastal vegetation restoration.
• Search and rescue, emergency medical support, relief distribution, and rapid restoration of essential services.

An earthquake is the sudden shaking of the Earth's surface caused by the release of stored energy within the crust. Most earthquakes result from movement along geological faults due to tectonic plate interactions. Volcanic activity, reservoir loading, mining, and underground explosions may also trigger seismic events.

Effects:

• Ground shaking and surface rupture.
• Collapse of buildings, bridges, roads, and utilities.
• Fires, landslides, liquefaction, and tsunamis.
• Death, injury, displacement, and psychological trauma.

Safety measures:

Before:

• Construct and retrofit buildings according to seismic codes.
• Secure heavy furniture and prepare emergency kits.
• Identify safe places and conduct drills.

During:

• Follow Drop, Cover, and Hold On indoors.
• Stay away from windows, shelves, and elevators.
• In open areas, move away from buildings, trees, and power lines.

After:

• Expect aftershocks and leave damaged buildings carefully.
• Check for injuries, gas leaks, fires, and electrical damage.
• Follow official information and assist vulnerable people without obstructing rescue operations.

A landslide is the downward movement of rock, soil, or debris along a slope under the influence of gravity.

Natural causes:

• Intense rainfall and saturation of soil.
• Earthquakes and volcanic activity.
• Weathering, erosion, and weak geological formations.
• Steep slopes and river or wave undercutting.

Human-induced causes:

• Deforestation and removal of slope vegetation.
• Unplanned road cutting, mining, quarrying, and construction.
• Overloading slopes with buildings or waste.
• Poor drainage and leakage from water systems.

Warning signs: New ground cracks, tilting trees or poles, bulging slopes, unusual sounds, blocked streams, and sudden changes in spring or well water.

Mitigation measures:

• Hazard zonation and restriction of construction on unstable slopes.
• Afforestation and protection of natural vegetation.
• Retaining walls, rock bolts, terracing, and slope stabilization.
• Surface and subsurface drainage systems.
• Monitoring rainfall and slope movement, issuing warnings, and preparing evacuation routes.

Avalanches are rapid movements of snow, ice, and debris down a mountain slope. They may be triggered by heavy snowfall, rapid warming, weak snow layers, strong winds, earthquakes, or human activities such as skiing and blasting.

Avalanche risk reduction:

• Snowpack monitoring and avalanche forecasting.
• Hazard maps and closure of dangerous routes.
• Snow fences, barriers, controlled blasting, and protective structures.
• Rescue equipment, trained teams, and public awareness.

Volcanic eruptions occur when magma, gases, and ash escape through weaknesses in the Earth's crust. Pressure from dissolved gases, tectonic activity, and magma movement can trigger eruptions.

Volcanic risk reduction:

• Monitoring seismic activity, gas emissions, ground deformation, and temperature.
• Mapping lava, ash, pyroclastic-flow, and lahar hazard zones.
• Establishing exclusion zones and evacuation plans.
• Protecting water supplies and using masks during ashfall.

Comparison: Avalanche control often focuses on stabilizing snow and managing mountain access, whereas volcanic management relies heavily on scientific monitoring, land-use controls, and timely evacuation because eruptions generally cannot be physically prevented.

Manmade disasters are destructive events caused mainly by human actions, technological systems, negligence, conflict, or deliberate acts. Examples include industrial fires, chemical leaks, nuclear accidents, oil spills, transport crashes, building collapses, and warfare.

Major contributing factors:

• Technological failure: Defective equipment, software failure, power loss, or breakdown of safety systems can allow hazardous processes to become uncontrolled.
• Human error: Incorrect operation, poor judgment, fatigue, inadequate training, or communication failure can initiate or worsen an accident.
• Negligence: Failure to maintain equipment, follow safety standards, inspect facilities, or enforce regulations increases vulnerability.
• Poor planning: Hazardous industries located near dense settlements expose more people to danger.
• Organizational failure: Weak safety culture, cost-cutting, and unclear responsibility prevent effective risk control.

Manmade disasters can be reduced through strict regulation, regular safety audits, trained personnel, preventive maintenance, emergency plans, transparent reporting, and accountability.

A nuclear disaster involves an uncontrolled release of radioactive material from a reactor, nuclear facility, weapon, or radioactive source.

Major hazards:

• External exposure to ionizing radiation.
• Internal contamination through inhalation or ingestion.
• Acute radiation sickness at high exposure levels.
• Increased long-term risk of cancer and genetic damage.
• Contamination of soil, water, crops, livestock, and food chains.
• Large-scale evacuation, economic loss, and long-term exclusion zones.

Emergency management components:

• Continuous radiation monitoring and reliable warning systems.
• Clearly defined emergency planning zones around facilities.
• Rapid assessment of wind direction and radioactive plume movement.
• Shelter-in-place instructions or organized evacuation based on exposure risk.
• Distribution of potassium iodide only under official medical direction to reduce radioactive iodine uptake by the thyroid.
• Decontamination of people, equipment, food, water, and affected locations.
• Medical screening, dose recording, and long-term health surveillance.
• Secure containment, radioactive waste management, public communication, and independent safety review.

A chemical disaster is the accidental or deliberate release, fire, or explosion of toxic, corrosive, flammable, or reactive chemicals that harms people, property, or the environment.

Common causes:

• Leakage from industrial plants, pipelines, or storage tanks.
• Transport accidents involving hazardous materials.
• Equipment failure, poor maintenance, and unsafe handling.
• Fire, explosion, incompatible chemical mixing, or improper waste disposal.
• Natural hazards damaging chemical facilities.

Effects: Poisoning, burns, breathing difficulty, fire, environmental contamination, livestock deaths, and long-term health problems.

Emergency response:

• Identify the chemical through labels, monitoring devices, and safety data sheets.
• Isolate the area and establish hot, warm, and cold safety zones.
• Approach from upwind and use appropriate personal protective equipment.
• Decide between sheltering and evacuation according to the chemical and plume movement.
• Remove victims from exposure, decontaminate them, and provide medical treatment.
• Contain spills when trained personnel can do so safely.
• Warn the public clearly and monitor air, soil, food, and water until the area is safe.

A biological disaster is a large-scale harmful event caused by pathogenic microorganisms, toxins, infected vectors, or deliberate biological agents. It may affect humans, animals, plants, or several of these groups.

Examples: Epidemics, pandemics, zoonotic disease outbreaks, food-borne disease, livestock epidemics, and biological attacks.

Prevention and control measures:

• Disease surveillance and rapid laboratory diagnosis.
• Early reporting, contact tracing, and epidemiological investigation.
• Vaccination and preventive medication where available.
• Isolation of infected patients and risk-based quarantine of exposed persons.
• Infection prevention in hospitals, including hand hygiene and protective equipment.
• Safe drinking water, sanitation, food safety, and waste disposal.
• Vector control and environmental cleanliness.
• Coordination through a One Health approach linking human, animal, and environmental health.
• Risk communication that is timely, accurate, and free from stigma.
• Maintenance of essential health services, medicines, hospital beds, and trained personnel.

Preparedness plans must balance public health protection with ethical safeguards and community cooperation.

Transport accidents include major road crashes, railway collisions, aircraft accidents, and maritime disasters.

Common causes:

• Speeding, fatigue, distraction, intoxication, and violation of traffic rules.
• Mechanical failure and inadequate maintenance.
• Poor road, track, airport, or port infrastructure.
• Bad weather, low visibility, navigation errors, and communication failure.
• Overloading and unsafe transport of hazardous materials.

Mass-casualty response principles:

• Secure the scene and prevent secondary accidents.
• Activate a unified incident command system.
• Conduct rapid search, rescue, and triage so limited resources reach those with the most urgent survivable injuries.
• Provide first aid, stabilization, and organized transport to suitable hospitals.
• Maintain communication among police, fire services, medical teams, transport authorities, and hospitals.
• Establish casualty information and family assistance systems.
• Preserve evidence for investigation without delaying lifesaving work.
• Restore transport services only after safety inspection and hazard removal.

Prevention requires enforcement, trained operators, safe infrastructure, vehicle inspection, and emergency preparedness.

India's disaster management framework is primarily established under the Disaster Management Act, 2005 and follows a multi-level institutional structure.

National level:

• The National Disaster Management Authority, chaired by the Prime Minister, lays down national policies, plans, and guidelines.
• The National Executive Committee assists in coordinating and implementing national policies and plans.
• The National Disaster Response Force provides specialized response for major disasters.
• The National Institute of Disaster Management supports training, research, and capacity building.

State level:

• The State Disaster Management Authority, chaired by the Chief Minister, develops state policies and plans.
• The State Executive Committee coordinates implementation by state departments.

District and local levels:

• The District Disaster Management Authority prepares and implements district plans and coordinates local response.
• Municipalities, panchayats, and community institutions support preparedness, evacuation, relief, and recovery.

Key features: A multi-hazard approach, prevention and mitigation, preparedness, inter-agency coordination, capacity building, response funds, early warning, and integration of disaster risk reduction into development planning.

Governmental agencies provide legal authority, technical resources, coordination, and public services throughout the disaster management cycle.

Preparedness:

• Conduct hazard, vulnerability, and risk assessments.
• Prepare disaster management and evacuation plans.
• Establish early-warning and emergency communication systems.
• Train responders, conduct drills, and maintain emergency stockpiles.
• Enforce building codes, land-use regulations, and industrial safety standards.

Response:

• Activate emergency operations centers and incident command systems.
• Issue warnings and evacuation orders.
• Deploy police, fire services, medical teams, armed forces when required, and specialized response forces.
• Organize search and rescue, shelter, food, water, sanitation, health care, and security.
• Coordinate departments and maintain accurate public information.

Recovery:

• Assess damage and distribute assistance transparently.
• Restore electricity, water, transport, schools, and health facilities.
• Support housing, livelihoods, psychosocial care, and rehabilitation.
• Reconstruct safer infrastructure and review lessons from the event.

Effective government response requires clear responsibilities, decentralization, accountability, and coordination with civil society and communities.

Non-governmental organizations, or NGOs, complement public agencies by mobilizing specialized skills, volunteers, funds, and community networks.

Major roles:

• Conduct rapid needs assessments in affected areas.
• Provide food, safe water, shelter materials, sanitation, health care, and psychosocial support.
• Reach remote locations and vulnerable groups such as children, older people, persons with disabilities, and displaced families.
• Support rescue training, public awareness, and community preparedness.
• Restore livelihoods, schools, health services, and housing during recovery.
• Advocate for human rights, inclusion, transparency, and environmentally responsible reconstruction.
• Monitor relief distribution and provide feedback from communities to authorities.

Limitations and safeguards:

• Uncoordinated activity can cause duplication in visible locations while remote areas remain underserved.
• Inaccurate assessments or unsolicited supplies may waste resources.
• NGOs should coordinate with government control rooms, follow common standards, share verified data, respect local leadership, and remain accountable to affected people.

Their effectiveness depends on preparedness, technical competence, impartiality, transparency, and sustained local partnerships.

Community-based organizations, or CBOs, include resident associations, self-help groups, youth clubs, faith-based groups, local committees, and other locally rooted institutions.

Contributions to disaster management:

• Identify local hazards, vulnerable households, safe routes, shelters, and available resources.
• Incorporate indigenous knowledge and past disaster experience into risk maps and plans.
• Spread warnings rapidly in local languages and accessible formats.
• Organize evacuation, first aid, local search and rescue, community kitchens, and shelter management.
• Maintain lists of children, older persons, persons with disabilities, and others requiring assistance.
• Monitor relief distribution and reduce exclusion or misuse.
• Support debris removal, livelihood restoration, reconstruction, and psychosocial recovery.
• Conduct drills, awareness programs, and environmental conservation activities before disasters.

CBOs often act before outside assistance arrives. Their participation makes disaster plans more realistic, trusted, inclusive, and sustainable, but they require training, equipment, financial support, and formal links with government agencies.

Media organizations support disaster management by connecting authorities, responders, affected communities, and the wider public.

Constructive roles:

• Disseminate verified warnings, evacuation orders, shelter locations, helpline numbers, and safety instructions.
• Provide real-time information about affected areas and unmet needs.
• Counter rumors and misinformation through fact-checking.
• Promote donations, volunteering, preparedness, and public accountability.
• Highlight neglected communities and track the progress of relief and recovery.

Ethical responsibilities:

• Verify information before publication and clearly label uncertainty.
• Avoid sensationalism, panic-inducing headlines, and graphic content without public-interest justification.
• Protect the dignity, privacy, and identity of victims, especially children.
• Avoid interfering with rescue operations or revealing sensitive security information.
• Provide accessible information in relevant languages and formats.
• Correct errors promptly and distinguish official warnings from opinion.

Social media can spread warnings rapidly, but it can also amplify rumors. Responsible media should verify user-generated content, cite credible sources, and prioritize actionable public safety information.

An integrated plan must manage the primary cyclone as well as the secondary flood, chemical, health, and displacement risks.

Immediate actions:

• Activate a unified incident command and emergency operations center.
• Issue cyclone, flood, storm-surge, and chemical hazard warnings through multiple channels.
• Evacuate exposed coastal and industrial zones using pre-identified routes, giving priority to vulnerable people.
• Deploy trained teams for rescue, medical triage, hazardous-material control, firefighting, and water rescue.
• Establish safe shelters outside flood and chemical plume zones.

Stakeholder coordination:

• Government agencies: Lead command, warnings, evacuation, security, rescue, health services, infrastructure restoration, and resource allocation.
• Scientific and technical agencies: Track the cyclone, forecast flooding, model chemical dispersion, and monitor contamination.
• NGOs: Supply shelter, water, sanitation, health care, protection services, and livelihood assistance under the official coordination system.
• Community-based organizations: Identify vulnerable residents, spread local warnings, support evacuation, manage shelters, and report urgent needs.
• Media: Broadcast verified instructions, correct rumors, and publicize helplines without exposing sensitive information.

Recovery priorities: Conduct damage and contamination assessments, restore essential services, provide psychosocial and livelihood support, investigate industrial failure, and rebuild housing and infrastructure to safer standards.