Unit 5: Disaster management - Subjective Questions

A natural disaster is a severe and sudden event caused by natural processes of the Earth that results in loss of life, damage to property, environmental destruction, and disruption of normal community activities.

Major characteristics:

• It is caused by natural phenomena such as floods, earthquakes, cyclones, droughts, landslides, avalanches, or volcanic eruptions.
• It may occur suddenly, as in an earthquake, or gradually, as in a drought.
• Its effects depend on the intensity of the event, population density, preparedness, and vulnerability of the affected area.
• It can cause deaths, injuries, displacement, economic losses, disease outbreaks, and environmental degradation.

Examples: Earthquakes, floods, cyclones, droughts, landslides, avalanches, and volcanic eruptions are natural disasters.

Water-related disasters include floods, droughts, storm surges, cloudbursts, and tsunamis. They are associated with excess or shortage of water.

Causes:

• Heavy rainfall, cloudbursts, cyclones, and rapid snowmelt
• Poor drainage and encroachment on wetlands
• Deforestation and soil erosion
• Climate variability and changes in rainfall patterns
• Overuse of groundwater and prolonged absence of rainfall

Impacts:

• Loss of life, crops, livestock, houses, and infrastructure
• Contamination of drinking water and spread of diseases
• Food insecurity, migration, and economic losses
• Water scarcity, crop failure, and malnutrition during droughts

Management measures:

• Construct and maintain dams, embankments, drainage systems, and rainwater harvesting structures.
• Improve flood forecasting, early-warning systems, and drought monitoring.
• Protect wetlands, forests, watersheds, and river floodplains.
• Promote water conservation, drought-resistant crops, and efficient irrigation.
• Prepare evacuation plans and maintain emergency supplies.

Both disasters can be reduced through proper land-use planning, community preparedness, environmental conservation, and effective early-warning systems.

Cyclones are intense low-pressure systems accompanied by strong winds, heavy rainfall, and sometimes storm surges. Storms are disturbances in the atmosphere involving strong winds, rain, thunder, or lightning.

Before a cyclone or storm:

• Monitor official weather forecasts and warning messages.
• Identify evacuation routes, shelters, and emergency contacts.
• Secure roofs, windows, electrical equipment, boats, and loose objects.
• Store drinking water, dry food, medicines, flashlights, and first-aid supplies.
• Evacuate coastal and low-lying areas when instructed.

During the event:

• Stay indoors and remain away from windows and weak structures.
• Switch off electricity and gas if advised.
• Do not travel through flooded roads or go near the sea.
• Follow instructions from disaster-management authorities.

After the event:

• Avoid fallen power lines, damaged buildings, and contaminated water.
• Assist injured persons and report emergencies.
• Restore sanitation, clear debris safely, and inspect infrastructure before reuse.

An earthquake is the sudden shaking of the ground caused by the release of energy within the Earth's crust, usually along faults or tectonic plate boundaries.

Causes:

• Movement of tectonic plates
• Sudden rupture along geological faults
• Volcanic activity
• Occasionally, human activities such as mining, reservoir construction, or underground explosions

Effects:

• Collapse of buildings, bridges, roads, and dams
• Deaths, injuries, homelessness, and disruption of communication
• Fires, landslides, liquefaction, and tsunamis
• Economic losses and psychological trauma

Safety measures:

• Construct earthquake-resistant buildings and enforce building codes.
• During shaking, follow Drop, Cover, and Hold On.
• Stay away from windows, heavy objects, and damaged structures.
• After the earthquake, check for injuries, turn off gas and electricity if necessary, and use official information.
• Conduct earthquake drills and prepare emergency kits.

Landslides are the downward movement of soil, rocks, or debris on a slope. Avalanches are the rapid downward movement of snow, ice, and debris from a mountain slope.

Comparison:

• Material: Landslides mainly involve soil and rock, whereas avalanches mainly involve snow and ice.
• Causes: Landslides may result from heavy rainfall, earthquakes, deforestation, slope cutting, and mining. Avalanches are caused by heavy snowfall, temperature changes, weak snow layers, wind loading, or vibrations.
• Impacts: Both can bury people, damage settlements, block roads, destroy forests, and disrupt communication.

Mitigation measures:

• Maintain vegetation and carry out afforestation on unstable slopes.
• Improve surface and subsurface drainage.
• Construct retaining walls, rock bolts, avalanche barriers, and protective galleries where appropriate.
• Restrict construction and road cutting in hazardous zones.
• Use hazard mapping, monitoring, early warnings, evacuation plans, and public awareness programmes.

A volcanic eruption occurs when magma, gases, ash, and fragmented rock escape from a volcano through a vent or fissure.

Principal hazards:

• Lava flows that burn or bury land and infrastructure
• Ash clouds that affect breathing, agriculture, aviation, and water supplies
• Pyroclastic flows consisting of extremely hot gases, ash, and rock
• Lahars, or volcanic mudflows, that travel rapidly along valleys
• Toxic gases, landslides, earthquakes, and possible tsunamis

Risk-reduction measures:

• Monitor seismic activity, ground deformation, gas emissions, and temperature changes.
• Prepare volcanic hazard maps and identify exclusion zones.
• Establish warning systems, evacuation routes, shelters, and emergency communication.
• Educate communities about ash protection, safe water, and evacuation procedures.
• Use masks or cloth coverings to reduce ash inhalation and keep doors and windows closed during ashfall.
• Avoid valleys and river channels during lahar warnings.

Manmade disasters are destructive events caused directly or indirectly by human actions, negligence, technological failures, conflict, or unsafe practices.

Major causes:

• Industrial accidents, fires, explosions, and structural failures
• Release of toxic chemicals or radioactive materials
• War, terrorism, riots, and sabotage
• Transport accidents involving road, rail, air, or water transport
• Poor maintenance, weak safety standards, and inadequate emergency planning
• Pollution and irresponsible management of hazardous waste

Consequences:

• Deaths, injuries, disability, and psychological trauma
• Damage to houses, industries, transport systems, and public services
• Air, water, and soil pollution
• Displacement of people and loss of livelihoods
• Long-term health problems, ecological damage, and economic disruption

Prevention requires strict regulations, risk assessment, safety audits, worker training, emergency plans, proper land-use planning, and accountability for violations.

A nuclear disaster is an accidental or deliberate release of radioactive materials or radiation from a nuclear facility, weapon, transport system, or radioactive source.

Causes:

• Reactor malfunction, cooling-system failure, or human error
• Natural hazards affecting nuclear installations
• Mishandling or improper storage of radioactive materials
• Transport accidents, sabotage, or conflict

Effects:

• Radiation sickness, burns, cancer, genetic effects, and death
• Contamination of air, soil, water, food, and livestock
• Long-term ecological damage and restricted land use
• Psychological stress, displacement, and economic losses

Response measures:

• Activate emergency command systems and continuously monitor radiation levels.
• Inform the public clearly and provide shelter or evacuation instructions.
• Control access to contaminated areas and decontaminate people, equipment, and locations.
• Distribute protective equipment and stable iodine when directed by health authorities.
• Test food and water, provide medical care, and safely manage radioactive waste.
• Maintain long-term health surveillance and environmental monitoring.

Chemical disasters involve the accidental or intentional release, explosion, fire, or improper disposal of hazardous chemicals.

Causes:

• Industrial leaks, storage failures, pipeline ruptures, and explosions
• Unsafe transportation and handling of hazardous substances
• Inadequate maintenance, poor training, and failure to follow safety procedures
• Illegal dumping or improper disposal of toxic waste

Health and environmental effects:

• Eye and skin irritation, burns, breathing difficulty, poisoning, and death
• Contamination of air, water, and soil
• Damage to crops, livestock, aquatic organisms, and ecosystems
• Long-term illnesses such as respiratory disorders, cancer, or organ damage

Management strategies:

• Prepare chemical inventories, safety data sheets, hazard maps, and emergency plans.
• Use safe storage, labelling, ventilation, protective equipment, and regular inspections.
• Install leak-detection, fire-control, and automatic shutdown systems.
• Provide public alerts, evacuation or shelter-in-place instructions, and medical treatment.
• Trained response teams should contain the leak, decontaminate affected areas, and dispose of waste safely.
• Industries must follow the principles of prevention, preparedness, response, and recovery.

Biological disasters are emergencies caused by infectious microorganisms, toxins, or biological agents that affect humans, animals, or plants.

Examples: Epidemics, pandemics, zoonotic diseases, outbreaks caused by contaminated food or water, and attacks involving biological agents.

Causes and contributing factors:

• Transmission through air, water, food, vectors, animals, or direct contact
• Poor sanitation, overcrowding, population movement, and weak health systems
• Antimicrobial resistance and delayed detection

Prevention and control:

• Conduct disease surveillance, laboratory testing, contact tracing, and early reporting.
• Promote vaccination, hand hygiene, sanitation, safe food, and clean drinking water.
• Isolate infected persons and quarantine exposed individuals when necessary.
• Provide personal protective equipment and infection-control training to health workers.
• Communicate accurate information and counter misinformation.
• Coordinate hospitals, laboratories, government departments, international agencies, and communities.
• Continue monitoring and rehabilitation after the outbreak is controlled.

Transport accidents include collisions, derailments, aircraft crashes, ship accidents, fires, and hazardous-material spills involving road, rail, air, or water transport.

Common causes:

• Speeding, reckless driving, fatigue, alcohol or drug use
• Mechanical failure, poor maintenance, and unsafe infrastructure
• Bad weather, poor visibility, and inadequate navigation
• Overloading, human error, weak regulation, and hazardous cargo mishandling

Impacts:

• Deaths, injuries, disability, fires, traffic disruption, and property loss
• Environmental pollution from fuel or chemical spills
• Psychological trauma and economic losses

Risk-reduction measures:

• Enforce traffic laws, licensing standards, speed limits, and safety regulations.
• Maintain vehicles, roads, tracks, aircraft, ships, signals, and communication systems.
• Use seat belts, helmets, child restraints, airbags, life jackets, and fire extinguishers.
• Train drivers, pilots, crew members, and emergency responders.
• Mark hazardous cargo, prepare emergency routes, and conduct rescue drills.
• Improve public awareness and ensure rapid medical and firefighting response.

The disaster management cycle is a continuous process through which communities and institutions reduce risk, prepare for emergencies, respond to disasters, and recover from their effects.

Main phases:

• Mitigation: Long-term actions that reduce hazard impacts, such as building codes, afforestation, flood control, and land-use planning.
• Preparedness: Planning and readiness activities, including drills, early-warning systems, stockpiling, training, and emergency communication.
• Response: Immediate actions such as search and rescue, evacuation, first aid, shelter, food, water, and security.
• Recovery: Restoration and improvement of services, livelihoods, infrastructure, health, and the environment.
• Reconstruction: Building safer facilities and applying the principle of build back better.

Disaster risk reduction links all these phases by identifying hazards, reducing exposure and vulnerability, strengthening capacity, and promoting resilience. Effective management is therefore proactive rather than limited to emergency relief.

A national disaster management framework is the system of laws, institutions, policies, plans, resources, and procedures used by a country to manage disaster risk and emergencies.

Principal components:

• Legal and policy framework: Defines responsibilities, standards, authority, and accountability.
• National coordinating authority: Develops policies, plans, guidelines, risk assessments, and preparedness programmes.
• Emergency operations and response forces: Provide search and rescue, logistics, medical aid, communications, and evacuation support.
• State, provincial, district, and local structures: Adapt national plans to local hazards and coordinate field-level action.
• Risk assessment and early warning: Identify hazards, exposure, vulnerability, and possible impacts.
• Capacity building: Includes training, mock drills, public education, equipment, and resource mobilization.
• Financial mechanisms: Provide emergency funds, insurance, compensation, and recovery financing.
• Recovery and reconstruction: Restore essential services and reduce future risk through resilient development.

The framework requires coordination among government departments, communities, NGOs, scientific institutions, private organizations, and international agencies.

Governmental agencies have the primary responsibility for protecting life, coordinating resources, and restoring essential services during disasters.

National level:

• Formulate policies, laws, standards, and national response plans.
• Coordinate defence, health, transport, communications, weather, and scientific agencies.
• Mobilize specialized response forces, funds, equipment, and technical expertise.
• Issue national warnings and support affected regions.

Regional or state level:

• Prepare hazard-specific plans and coordinate districts.
• Manage shelters, hospitals, relief supplies, evacuation, and public information.
• Deploy police, fire services, medical teams, engineers, and civil defence personnel.

Local level:

• Maintain local risk maps, emergency registers, shelters, and evacuation routes.
• Conduct early warning, evacuation, search and rescue, first aid, and relief distribution.
• Assess damage and support restoration of water, sanitation, electricity, roads, and communications.

Government agencies must ensure inclusive assistance for children, older persons, persons with disabilities, women, and economically vulnerable groups.

Non-governmental organizations (NGOs) support government agencies and communities before, during, and after disasters.

Before disasters:

• Conduct awareness programmes, vulnerability assessments, and community training.
• Organize first-aid instruction, evacuation drills, and preparedness planning.
• Support livelihood strengthening and risk-reduction projects.

During disasters:

• Provide food, water, clothing, temporary shelters, medicines, and sanitation facilities.
• Operate health camps, psychosocial support services, child-protection activities, and help desks.
• Assist with search and rescue, evacuation, damage assessment, and communication with vulnerable groups.
• Reach remote communities that may be difficult for government teams to access.

During recovery:

• Rebuild homes, schools, health centres, water systems, and livelihoods.
• Support education, trauma counselling, legal assistance, and community rehabilitation.
• Promote participatory and resilient reconstruction.

NGOs should coordinate with official authorities, follow humanitarian standards, avoid duplication, ensure transparency, and involve affected people in decisions.

Community-based organizations (CBOs) are local groups formed by residents, such as village committees, youth clubs, self-help groups, resident associations, and volunteer teams.

Importance:

• Local people understand local hazards, resources, vulnerable households, and cultural practices.
• CBOs can act quickly before outside assistance arrives.
• They build trust, participation, self-reliance, and social cohesion.

Functions:

• Prepare local hazard maps, resource inventories, contact lists, and evacuation plans.
• Disseminate warnings in local languages and identify people needing special assistance.
• Organize volunteers for evacuation, first aid, search and rescue, shelter management, and relief distribution.
• Maintain emergency supplies, boats, communication tools, and community shelters.
• Monitor relief delivery and prevent exclusion or discrimination.
• Support restoration of livelihoods, sanitation, schools, and local infrastructure.

CBOs should work in coordination with local government, NGOs, health workers, and emergency services while ensuring the participation of women, marginalized groups, and persons with disabilities.

Role in preparedness:

• Disseminates hazard information, early warnings, evacuation instructions, and safety education.
• Conducts public-awareness campaigns through television, radio, newspapers, websites, and social media.
• Explains emergency contacts, shelter locations, and preparedness procedures.

Role during response:

• Provides timely information about affected areas, road conditions, shelters, weather, and official instructions.
• Helps authorities reach large populations and allows families to share verified information about missing persons.
• Highlights urgent needs and brings attention to underserved communities.

Role in recovery:

• Reports relief and rehabilitation progress, promotes donations and volunteerism, and discusses lessons learned.
• Encourages accountability and public participation in reconstruction.

Limitations and responsibilities:

• False rumours, sensational reporting, privacy violations, panic, and unverified social-media posts can worsen a crisis.
• Media organizations should verify information, use official sources, protect survivors' dignity, avoid discrimination, and provide accessible messages in local languages. A designated spokesperson and unified communication system can reduce confusion.

An early-warning system provides timely and understandable information about a potential hazard so that people and authorities can take protective action before impacts occur.

Essential elements:

• Risk knowledge: Identification of hazards, exposed populations, vulnerable infrastructure, and likely consequences.
• Monitoring and forecasting: Use of weather stations, satellites, seismic instruments, river gauges, disease surveillance, and other technologies.
• Warning communication: Delivery of accurate alerts through sirens, radio, television, mobile messages, public-address systems, and local volunteers.
• Response capability: Clearly defined evacuation routes, shelters, transport, emergency teams, supplies, and responsibilities.
• Community participation: Local knowledge, regular drills, inclusive communication, and special arrangements for vulnerable groups.

An effective system must be accurate, timely, reliable, accessible, and linked to a clear action. A warning that does not reach people or explain what they should do cannot reduce disaster risk.

Disaster preparedness consists of arrangements made in advance to ensure an effective response and rapid recovery.

Important principles:

• Identify local hazards, vulnerable people, critical facilities, and available resources.
• Establish clear roles, responsibilities, communication channels, and decision-making authority.
• Prepare emergency kits containing water, food, medicines, first-aid items, documents, a flashlight, batteries, and basic protective equipment.
• Develop evacuation routes, assembly points, shelter arrangements, and emergency contact lists.
• Protect important documents, equipment, livestock, and essential services.
• Conduct regular training, simulations, and mock drills.
• Include children, older people, persons with disabilities, pregnant women, and people requiring medical support.

Households should prepare family plans and know how to switch off utilities. Institutions such as schools, hospitals, and industries should maintain emergency plans, trained teams, backup systems, fire safety equipment, and coordination procedures with local authorities.