Unit 3
🎯 Unit 3 Overview
Unit 3 explains the relationship between disasters and development. It covers vulnerability factors,
differential impacts, impact of development projects, dams, embankments, land-use changes,
climate change adaptation, IPCC scenario, indigenous knowledge, appropriate technology and local resources.
Exam Tip: Disaster and development relationship, vulnerability factors, climate change adaptation, development projects and indigenous knowledge are important for RGPV exams.
📘 Disaster and Development Relationship
Disasters and development are closely connected. Poor development can increase disaster risk,
while good development can reduce vulnerability and improve resilience.
Key Points
- Unplanned development increases disaster risk.
- Safe development reduces vulnerability.
- Disasters destroy development gains.
- Development planning should include disaster risk reduction.
- Sustainable development supports disaster resilience.
⚠️ Factors Affecting Vulnerabilities
Vulnerability means weakness that increases the impact of disasters. Different social, economic,
physical and environmental factors affect vulnerability.
| Factor |
Effect on Vulnerability |
| Poverty |
Poor people often live in unsafe houses and high-risk areas. |
| Unplanned Urbanization |
Increases flood, fire and building collapse risk. |
| Weak Infrastructure |
Buildings, roads and bridges may fail during disasters. |
| Low Awareness |
People may not know safety measures and evacuation plans. |
| Environmental Degradation |
Deforestation and land degradation increase disasters. |
| Social Inequality |
Women, children, elderly and disabled people may suffer more. |
👥 Differential Impacts of Disasters
Disasters affect different groups differently. Impact depends on income, gender, age, health,
location, occupation and access to resources.
Examples
- Poor families suffer more because of weak housing.
- Farmers suffer more during drought and flood.
- Children and elderly people need special support.
- Women may face health and safety issues during relief camps.
- People with disabilities face difficulty in evacuation.
🏗️ Impact of Development Projects
Development projects such as dams, roads, industries, mining and urban expansion can create both
benefits and disaster risks.
Positive Impact
Improves infrastructure, jobs, transport, irrigation, electricity and economic growth.
Negative Impact
Can cause displacement, environmental damage, deforestation and increased hazard risk.
Examples
- Road cutting in hills may increase landslide risk.
- Urban construction on wetlands may increase flooding.
- Industrial development may increase chemical disaster risk.
🌊 Dams and Disaster Risk
Dams are useful for irrigation, electricity generation and flood control, but improper planning
or failure can create disaster risks.
Risks Related to Dams
- Displacement of people
- Reservoir-induced earthquakes
- Downstream flooding if dam fails
- Ecological imbalance
- Siltation and waterlogging
🧱 Embankments and Disaster Risk
Embankments are raised structures built along rivers to prevent flooding. They can reduce flood risk
but may also create problems if not maintained properly.
Advantages
- Protects nearby settlements from floods.
- Controls river overflow.
- Supports agriculture in flood-prone areas.
Limitations
- May break during heavy floods.
- Can increase flood pressure downstream.
- May create waterlogging.
- Requires regular maintenance.
🌱 Land-Use Changes
Land-use change means changing the natural or existing use of land, such as forest to urban area
or agricultural land to industrial area.
Impact on Disaster Risk
- Deforestation increases landslide and flood risk.
- Construction on river banks increases flood damage.
- Wetland destruction reduces natural flood absorption.
- Hill cutting increases slope instability.
- Urban concrete surfaces increase water runoff.
🌡️ Climate Change Adaptation
Climate Change Adaptation means adjusting human and natural systems to reduce damage from climate change
effects such as floods, droughts, heat waves, cyclones and sea level rise.
Adaptation Measures
- Climate-resilient agriculture
- Rainwater harvesting
- Flood-resistant infrastructure
- Heat action plans
- Early warning systems
- Coastal protection
- Drought-resistant crops
- Water conservation
📊 IPCC Scenario
IPCC stands for Intergovernmental Panel on Climate Change. It studies climate change and provides
scientific reports about climate risks, impacts and adaptation strategies.
Important Points
- Climate change increases disaster frequency and intensity.
- Extreme rainfall events are increasing.
- Sea level rise threatens coastal regions.
- Heat waves and drought risks are increasing.
- Adaptation and mitigation are required to reduce climate risks.
🇮🇳 Climate Change Scenario in India
India is highly vulnerable to climate change due to high population, long coastline, agriculture
dependency and diverse geography.
Major Risks in India
- Floods in river basins
- Drought in dry regions
- Cyclones in coastal states
- Heat waves in urban areas
- Glacial melting in Himalayas
- Sea level rise affecting coastal cities
- Agricultural productivity loss
🌾 Indigenous Knowledge
Indigenous knowledge means traditional knowledge developed by local communities through long experience
with nature, climate and disasters.
Examples
- Traditional earthquake-resistant houses in Himalayan regions.
- Local flood warning based on river behavior.
- Traditional water harvesting methods in drought-prone areas.
- Use of local crops resistant to drought.
- Traditional cyclone shelters and community warning methods.
Indigenous knowledge local conditions ke hisaab se practical aur useful hota hai.
🛠️ Appropriate Technology
Appropriate technology means using simple, affordable, locally suitable and sustainable technology
for disaster risk reduction and development.
Examples
- Low-cost earthquake-resistant construction
- Rainwater harvesting structures
- Community radio for warning
- Solar lighting in disaster-prone areas
- Local flood monitoring systems
📍 Local Resources
Local resources include people, materials, skills, institutions and knowledge available within a community.
These resources are very useful during disaster preparedness, response and recovery.
Examples
- Local volunteers
- Community buildings
- Schools and panchayat halls
- Local transport
- Health workers
- Local construction material
- Traditional knowledge
⚖️ Good Development vs Risky Development
| Good Development |
Risky Development |
| Includes disaster risk reduction. |
Ignores disaster risk. |
| Uses safe land-use planning. |
Allows construction in hazard-prone areas. |
| Protects environment. |
Causes deforestation and pollution. |
| Builds resilience. |
Increases vulnerability. |
⭐ Important Questions
- Explain the inter-relationship between disasters and development.
- Explain factors affecting vulnerability.
- What are differential impacts of disasters?
- Explain impact of development projects on disaster risk.
- Explain dams and embankments with respect to disaster risk.
- Explain impact of land-use changes on disasters.
- What is climate change adaptation? Explain with examples.
- Write short note on IPCC scenario.
- Explain climate change scenario in India.
- Explain indigenous knowledge, appropriate technology and local resources.
📌 PYQ Analysis
| Topic |
Exam Importance |
| Disaster and Development Relationship |
Very High |
| Factors Affecting Vulnerability |
Very High |
| Development Projects |
High |
| Dams, Embankments and Land Use |
High |
| Climate Change Adaptation |
Very High |
| IPCC Scenario |
Medium |
| Indigenous Knowledge |
High |
❓ FAQs
How are disasters and development related?
Unsafe development increases disaster risk, while planned and sustainable development reduces vulnerability.
What is climate change adaptation?
Climate change adaptation means adjusting systems and practices to reduce damage from climate change impacts.
Why is indigenous knowledge important?
Indigenous knowledge is based on local experience and helps communities prepare for and respond to disasters effectively.
🔥 Last Minute Revision
- Disasters can destroy development gains.
- Poor development increases vulnerability.
- Safe development reduces disaster risk.
- Dams and embankments can reduce risk but may also create new risks.
- Land-use change affects flood, landslide and urban disaster risk.
- Climate change increases extreme weather events.
- IPCC studies climate change impacts and risks.
- Indigenous knowledge is local traditional disaster knowledge.
- Appropriate technology is affordable and locally suitable.