Disaster management

Joshimath's land subsidence and the Silkyara tunnel collapse, both in 2023, showed how projects in fragile terrain can create or magnify the very hazards they must withstand.

The contradiction

• The need: roads, tunnels, hydropower and tourism facilities bring connectivity, defence preparedness and livelihoods to remote Himalayan, Western Ghats and coastal regions.
• The risk: slope cutting, blasting, muck dumping and building on floodplains destabilise terrain; Kedarnath (2013), Chamoli (2021) and Wayanad (2024) showed how fragile slopes and rivers punish such intrusions.

Managing it: plan, build, govern, prepare

• Plan on risk: hazard mapping and carrying-capacity studies before projects; cumulative and strategic impact assessment for a whole valley instead of piecemeal clearances.
• Build right: risk-informed design with slope stabilisation, drainage and escape tunnels; avoid fault zones and river channels; bio-engineer slopes.
• Govern: respect eco-sensitive zones and expert advice such as the Gadgil and Kasturirangan reports on the Western Ghats; independent monitoring; participation of local communities.
• Warn and prepare: early warning for landslides and glacial lake outbursts (South Lhonak, 2023); 'build back better' under the Sendai Framework; the Coalition for Disaster Resilient Infrastructure, launched by India in 2019, to mainstream resilience in infrastructure.

In fragile regions development must be risk-informed by design, because resilience costs far less than reconstruction.

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In the first hours of most disasters, rescue and relief come from neighbours, not agencies; communities are the first responders and the last line of recovery.

Why community is the cornerstone

• Local knowledge of terrain, hazards and vulnerable people; the fastest response; ownership of preparedness; trust in warnings; sustainability of mitigation works.
• The statement holds because agencies cannot be everywhere: community capacity decides whether early warnings become evacuations and whether relief reaches the last house.
• Odisha: community-run cyclone shelters and trained village volunteers enabled mass evacuations before Phailin (2013) and Fani (2019), sharply cutting deaths.
• Kerala floods (2018): fishermen rescued thousands with their own boats; Kudumbashree groups supported relief and rebuilding.
• Traditional knowledge: the Onge of the Andamans read the 2004 tsunami's warning signs and moved to safety.
• Programmes: Aapda Mitra, with one lakh volunteers trained in 350 districts, Yuva Aapda Mitra, and 'Tsunami Ready' villages in Odisha.

Challenges to participation

• Low risk perception in normal times; exclusion of women, the disabled and the elderly; weak panchayat capacity and funds; top-down planning by agencies; volunteer attrition without incentives or insurance.

Measures to strengthen it

• Village and ward disaster plans made by local bodies and linked to district plans; training, equipment and insurance for volunteers; school safety programmes and regular mock drills.
• Inclusive planning that maps vulnerable households and gives women's groups a role; dedicated funds for local bodies; the Sendai Framework's whole-of-society approach as the guiding principle.
• Institutional link: state and district plans should fund community-based disaster risk reduction as a core function, not treat it as voluntary charity.

A whole-of-society approach, with trained and resourced communities at its base, turns disaster response into resilience.

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A tsunami is a series of very long-wavelength sea waves generated when a large volume of water is suddenly displaced; barely noticeable in the open ocean, it rears up to great heights on reaching the shore.

How they form

• Chief cause: undersea megathrust earthquakes at subduction zones that abruptly lift or drop the sea floor — the 2004 Sumatra–Andaman and 2011 Tohoku earthquakes.
• Other triggers: submarine landslides, volcanic eruptions (Krakatoa 1883, Hunga Tonga 2022) and, rarely, meteorite impacts.
• Mechanism: in deep water the waves race at jet-aircraft speed with low height; as depth falls near the coast they slow, bunch up and grow (shoaling).

Where

• Mainly the Pacific Ring of Fire; in the Indian Ocean, the Sunda trench threatens India's east coast and the Makran subduction zone its west coast.

Consequences

• Human: mass deaths and displacement — the 2004 tsunami devastated Tamil Nadu and the Andaman and Nicobar Islands.
• Economic and environmental: boats, ports and fishing livelihoods destroyed; farmland and aquifers salinised; mangroves, reefs and coastlines altered.
• Cascading hazards: the 2011 Tohoku tsunami triggered the Fukushima nuclear accident.

Reducing losses

• INCOIS's Tsunami Early Warning Centre, operational since 2007, detects tsunamigenic quakes within minutes; evacuation drills, shelterbelts and mangroves; UNESCO-IOC 'Tsunami Ready' communities.

Tsunamis cannot be prevented, but their toll can — through early warning, prepared communities and nature-based coastal defence.

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Asteroids are rocky or metallic remnants of the solar system's formation, most orbiting in the main belt between Mars and Jupiter; those whose orbits bring them close to Earth are tracked as near-Earth objects (NEOs).

What asteroids are

• They range from metres to hundreds of kilometres across and are classed by composition — carbonaceous, silicate or metallic; NEOs that pass within 0.05 AU of Earth's orbit and exceed about 140 m are termed potentially hazardous.

How real is the threat

• Evidence: the Chicxulub impact about 66 million years ago is linked to the dinosaurs' extinction; Tunguska (1908) flattened forest, and Chelyabinsk (2013) injured over a thousand people from a body only about 20 m wide.
• Probability: extinction-level impacts by kilometre-scale bodies are extremely rare, and most such objects are already catalogued with none on a collision course; city-destroying impacts by smaller bodies are more frequent and less completely tracked.
• Assessment: the threat is remote in any human lifetime but non-zero and irreversible, which justifies steady, low-cost preparation.

Strategies for prevention

• Detection: ground surveys and space telescopes, NASA's Planetary Defense Coordination Office, ESA programmes and ISRO's NETRA for tracking space objects.
• Deflection: NASA's DART (2022) struck Dimorphos and shortened its orbit by 32 minutes — the first kinetic-impactor test; ESA's Hera follows up, while gravity tractors and nuclear stand-off options are studied for larger bodies.
• Coordination: the UN-endorsed International Asteroid Warning Network and Space Mission Planning Advisory Group; the 2029 close approach of Apophis is a planned observation opportunity.
• Civil preparedness: impact-effects modelling and evacuation plans for small objects detected late.

The threat is remote but real; early detection, tested deflection and international cooperation turn a natural catastrophe into a manageable risk.

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Disaster resilience is the ability of a community, system or society exposed to hazards to resist, absorb, adapt to and recover from their effects in a timely way while preserving its essential functions.

How resilience is determined

• Risk factors: hazard exposure, physical and social vulnerability (poor housing, poverty, gender, disability) and coping capacity — income, infrastructure, institutions and social capital.
• System properties: robustness, redundancy, resourcefulness and rapidity; measured through indicators of risk, preparedness, recovery time and losses avoided.

Elements of a resilience framework

• Understanding risk: hazard mapping, vulnerability assessment and open risk data.
• Risk governance: clear laws, institutions and accountability from national to local level, as under India's Disaster Management Act 2005.
• Investing in reduction: resilient infrastructure, land-use zoning, building codes, insurance and ecosystem-based measures such as mangroves.
• Preparedness: early warning, trained community volunteers, drills and stockpiles.
• Recovery: 'build back better' so that reconstruction lowers future risk.
• Cross-cutting: community participation, finance and technology — the thrust of the Prime Minister's Ten-Point Agenda and the Coalition for Disaster Resilient Infrastructure (2019).

Sendai global targets (by 2030)

• A: substantially reduce disaster mortality, lowering the 2020–30 average per 100,000 below that of 2005–15.
• B: reduce the number of people affected.
• C: reduce direct economic loss relative to global GDP.
• D: reduce damage to critical infrastructure and disruption of basic services.
• E: increase countries with national and local DRR strategies (by 2020).
• F: enhance international cooperation to developing countries.
• G: increase availability of and access to multi-hazard early warning systems and risk information.

Resilience is built before disasters strike — by governing risk, investing in people and infrastructure, and measuring progress against Sendai's targets.

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Urban floods differ from riverine floods: intense rain on paved, encroached cities overwhelms drains within hours, and climate change is making such cloudbursts more frequent.

Causes

• Climate-induced: more frequent extreme rainfall and cyclonic rain; sea-level rise and tidal backflow that block drainage in coastal cities.
• Urban: lakes, wetlands and natural drains encroached; impervious surfaces raise run-off; undersized, clogged drains built for old rainfall norms; growth on floodplains and low-lying land; solid waste choking outfalls.
• Governance: fragmented agencies, weak enforcement of zoning and building rules, and poor real-time rainfall data.

Two major floods

• Mumbai, 26 July 2005: 944 mm of rain in 24 hours at Santa Cruz; the encroached Mithi river and choked drains, with a high tide, inundated over 60% of the city; heavy loss of life and days of paralysis led NDMA to treat urban flooding as a distinct disaster.
• Chennai, December 2015: very heavy north-east monsoon rain, encroached Pallikaranai marsh and the Adyar–Cooum floodplains, and a large release from Chembarambakkam reservoir flooded vast areas and shut the airport for days.

Policies and frameworks

• NDMA Guidelines on Management of Urban Flooding (2010): the first to treat it separately, prescribing city drainage plans, dense rain-gauge networks and early warning.
• Disaster Management Act 2005: State and district authorities and plans that now include urban flood protocols.
• Funding: the 15th Finance Commission's ₹2,500 crore under the National Disaster Mitigation Fund for integrated flood management in Mumbai, Chennai and Kolkata and flood prevention in Bengaluru, Hyderabad, Ahmedabad and Pune.
• Programmes: AMRUT storm-water drains, Smart Cities projects, IFLOWS-Mumbai and similar warning systems, Model Building Bye-laws 2016 mandating rainwater harvesting, and restoration of urban lakes and wetlands.

Cities must plan with water, not against it — restore wetlands, enforce floodplain zoning and design drains for tomorrow's rainfall, not yesterday's.

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A dam breach releases a flood wave with almost no warning, and the downstream valley bears the worst of it.

Causes of dam failure

• Hydrological: overtopping when a flood exceeds spillway capacity; extreme rainfall under climate change makes older design floods obsolete.
• Structural and geotechnical: seepage and piping through the embankment or foundation, weak foundation rock, and poor design or construction quality.
• Ageing and neglect: deteriorated concrete, silted reservoirs that shrink the flood cushion, jammed gates and outlets, and weak inspection and maintenance.
• External triggers: earthquakes, landslides into the reservoir that send waves over the crest, and cascading failure down a chain of dams.
• Operational lapses: delayed gate operation, no emergency action plan or downstream warning, and poor reservoir regulation during the monsoon.

Two large failures

• Machchhu-II dam, Morbi, Gujarat (1979): overtopped in heavy rain, sending a wall of water into Morbi town.
• Teton dam, USA (1976): failed through piping while the reservoir was being filled for the first time.

Lessons

• The Dam Safety Act 2021 creates national and state authorities; periodic safety reviews, Emergency Action Plans, DRIP rehabilitation and real-time flood forecasting must follow.

Prevention lies in design margins, regular inspection and rehearsed emergency plans, not in relief after the flood.

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A cloudburst is a sudden, very intense and localised downpour, taken by IMD as more than 10 cm of rain in an hour over roughly 20 to 30 sq km.

Mechanism

• Warm, moist monsoon air is forced up steep slopes (orographic lift) and cools, building towering cumulonimbus clouds whose strong updrafts hold large water droplets aloft.
• When the updraft weakens, or clouds are hemmed in by narrow valleys, the stored water falls all at once; interaction with a western disturbance can intensify the event.

Occurrence

• Mostly during the monsoon on mid-elevation slopes of the Himalayan belt (Uttarakhand, Himachal Pradesh, Jammu and Kashmir, Ladakh) and at times in the Western Ghats.
• Damage is magnified by deforestation, road-cutting and unplanned construction on fragile slopes and riverbeds, turning heavy rain into flash floods, landslides and debris flows.

Two recent examples

• Amarnath, Jammu and Kashmir, 8 July 2022: a cloudburst near the holy cave sent flash floods through the pilgrims' camps, sweeping away tents and taking lives.
• Kishtwar, Jammu and Kashmir, 28 July 2021: a cloudburst in a remote village caused deaths and destroyed houses.

Response

• Exact forecasting is not yet possible, so dense Doppler radar and automatic weather stations, nowcasting, hazard zoning, early warning and regulated construction are the tools.

Cloudbursts cannot be prevented; resilience lies in better nowcasting, disciplined land use in the hills and communities that know when to move.

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Coastal erosion is the loss of shoreline to waves, currents and storms; the National Centre for Coastal Research found that about a third of India's mainland coast (33.6% over 1990 to 2018) is eroding to varying degrees.

Causes

• Natural: wave action, longshore currents, storms and cyclones, tides, sea-level rise and loss of sediment supply.
• Human: dams and river-sand mining that cut the sediment reaching the coast; ports, harbours and breakwaters that block the natural drift of sand; seawalls that shift erosion down-coast; destruction of mangroves and dunes; and construction on the shore itself.

Effects

• People: loss of land, homes and livelihoods, especially of fishing communities; saltwater intrusion into wells and fields; damage to roads, ports and tourism; and displacement.
• Ecology: loss of beaches, mangroves and wetlands, damaged turtle-nesting habitats and greater exposure to floods and storm surges.

Coastal management techniques

• Hard engineering: seawalls, groynes, breakwaters, revetments and offshore reefs protect a stretch directly; they work locally but are costly, need maintenance and often shift erosion to the next stretch of coast.
• Soft engineering: beach nourishment with dredged sand, restoration of mangroves and dunes, and coastal shelterbelts that absorb wave energy and rebuild themselves after storms.
• Policy and planning: Coastal Regulation Zone rules, shoreline mapping and zoning, integrated coastal zone management, curbs on sand mining, and managed retreat where protection is not viable.

Working with natural buffers, curbing sand mining and planning settlements with shoreline data offer the most lasting protection.

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About 59% of India's land is earthquake-prone: 11% in zone V, 18% in zone IV and 30% in zone III (NIDM), and exposure keeps rising with unplanned urban growth.

Why India is vulnerable

• Tectonics: the Indian plate's push under the Eurasian plate strains the whole Himalayan arc; the Kachchh rift and peninsular faults also produce damaging shocks.
• Zoning: BIS zone V covers parts of the Himalaya, the North-East, Kachchh and the Andaman and Nicobar Islands; the peninsula has active pockets.
• Human factors: non-engineered masonry houses, dense unplanned towns, unsafe high-rises, weak code enforcement and low awareness turn tremors into disasters.
• Secondary hazards: landslides in the hills, liquefaction on soft soils and tsunamis from undersea quakes, as the 2004 Sumatra-Andaman earthquake (Mw 9.3) showed on India's coast.

Major earthquakes of the last three decades

• Uttarkashi 1991 and Chamoli 1999 (Garhwal Himalaya): mountain villages flattened, landslides blocked roads.
• Latur 1993 (Maharashtra): shallow quake in a region thought safe; village houses collapsed with heavy casualties.
• Bhuj 2001 (Gujarat): over 13,000 dead; liquefaction and collapse of multi-storey buildings as far as Ahmedabad exposed urban vulnerability.
• Kashmir 2005 and Sikkim 2011: landslides cut roads and delayed rescue in remote terrain.

Earthquakes cannot be predicted, so BIS-code construction, retrofitting, land-use planning, trained masons and NDRF-led community drills are the only dependable protection.

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A landslide is the downslope movement of rock, debris or earth under gravity; the Geological Survey of India estimates that 12.6% of India's land area, excluding snow-covered area, is landslide-prone, chiefly the Himalaya and the Western Ghats.

Causes

• Natural: steep slopes, weak or fractured rock, heavy and prolonged rainfall, cloudbursts, earthquakes, snowmelt runoff and river undercutting of slope toes, especially in the young fold mountains.
• Human: deforestation, unplanned road-cutting and construction on slopes, mining and quarrying, blocked drainage and shifting cultivation.

Effects

• Loss of lives, homes and farmland; blocked highways and rivers, with flash-flood risk when landslide dams burst.
• Lost livelihoods and tourism, cut-off villages, heavy relief and reconstruction cost, and siltation of rivers and reservoirs downstream.
• Repeated losses in Uttarakhand, Himachal Pradesh, Sikkim, Kerala, the North-East and the Nilgiris.

National Landslide Risk Management Strategy (NDMA, 2019)

• Hazard mapping: landslide inventories and susceptibility maps.
• Monitoring and early warning systems.
• Awareness programmes.
• Capacity building and training of stakeholders.
• Regulation and policy, including mountain-zone regulations.
• Stabilisation and mitigation of landslides.
• A proposed Centre for Landslide Management.

Mitigation on the ground

• Slope stabilisation with retaining walls, drainage and bio-engineering; no-construction zones on unstable slopes; afforestation; regulated road and hydropower works.
• Community readiness: local early-warning systems, trained village task forces and NDRF and SDRF preparedness.

Landslides cannot be eliminated, but hazard maps, regulated slope use and early warning that reaches the last village can cut the losses sharply.

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Until the Disaster Management Act, 2005, India treated disasters as relief events to be handled after the fact; the Act, and the measures since, treat them as risks to be prevented, mitigated and prepared for across the whole cycle.

The shift in approach

• From counting relief to reducing risk: prevention, mitigation, preparedness, response and recovery, with the NDMA, state and district authorities as the institutional spine.

Recent measures

• Planning: the National Disaster Management Plan (2016, revised 2019), aligned with the Sendai Framework, covers every hazard from prevention to recovery.
• Agenda: the Prime Minister's ten-point agenda (2016) mainstreams risk management in all development sectors, and seeks risk cover for all, women's leadership, risk mapping and technology.
• Early warning: better cyclone forecasts by the IMD, tsunami warning by INCOIS, flood forecasting by the CWC, and impact-based, last-mile alerts that let people move before the event.
• Resilient infrastructure: the Coalition for Disaster Resilient Infrastructure (CDRI), launched by India in 2019, and projects such as the National Cyclone Risk Mitigation Project.
• Funding: dedicated mitigation funds at national and state levels, recommended by the 15th Finance Commission, shift money from relief to prevention and preparedness.
• Community and capacity: Aapda Mitra volunteers, NDRF training and mock drills, school and hospital safety programmes, and GIS and drones for mapping and response.

Gaps that remain

• Weak local-body capacity, uneven enforcement of land-use and building codes, and thin risk data; risk-informed planning must reach panchayats and municipalities.

The test of the shift is fewer lives lost per event: preparedness, resilient infrastructure and community capacity save more lives and money than relief ever can.

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The same cyclone kills in one place and only disrupts in another. Vulnerability explains the gap: UNDRR defines it through the physical, social, economic and environmental factors that make people or assets susceptible to a hazard.

Characterising vulnerability

• Risk rises with hazard, exposure and vulnerability and falls with coping capacity; vulnerability is read through exposure (location), susceptibility (housing, health, income) and resilience (assets, insurance, institutions), and it varies within one village.

Types of vulnerability

• Physical: weak masonry, houses on floodplains, coasts, steep slopes and seismic zones, fragile lifelines; mapped in BMTPC's Vulnerability Atlas of India.
• Social: poverty, gender, age, disability, caste and low awareness; women, children, the elderly and the disabled suffer most.
• Economic: dependence on one livelihood such as rainfed farming or fishing, with no savings or insurance.
• Environmental: loss of forests, wetlands and mangroves that once absorbed floods, slides and storm surges.
• Institutional and attitudinal: weak early warning, lax building-code enforcement, fatalism; Odisha's journey from the 1999 super cyclone to Phailin (2013) shows these can be cut sharply.

Unlike the hazard, vulnerability can be reduced: safer construction, land-use planning, secure livelihoods, awareness and inclusive preparedness are the core of disaster risk reduction.

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Preparedness starts with knowing where a hazard can strike and how badly. Landslide hazard zonation grades hilly terrain into classes from very low to very high hazard, using slope, geology, drainage, land use, rainfall and the record of past slides.

What zonation gives

• A map that ranks terrain by relative hazard at a usable scale; the Geological Survey of India, the nodal agency, has been mapping landslide susceptibility of the hilly areas at 1:50,000 (since then completed nationwide), and NDMA's 2019 National Landslide Risk Management Strategy makes mapping its first component.

How it helps mitigation

• Land-use planning: keeps settlements, schools, hospitals and industries out of high-hazard zones; regulates construction in hill towns; restricts slope cutting and debris dumping.
• Infrastructure: guides safer alignments for roads, railways and hydel projects, and where risk remains, the design of drainage, retaining walls, rock bolting and bio-engineering.
• Prioritising money: high-hazard zones with people and assets at risk get funds first for stabilisation, drainage and relocation, so limited budgets save the most lives.
• Early warning and response: zones anchor rainfall thresholds, sensor and satellite monitoring, alerts, evacuation routes, shelters and drills for high-hazard villages.
• Awareness and law: published maps inform residents, and can back building codes, insurance pricing and enforcement.

Limits

• Maps are static and scale-dependent, need updating after heavy rain, earthquakes or construction, and work only when combined with risk assessment and local enforcement.

Zonation turns landslide preparedness from reaction into planning: it shows where not to build, where to invest in protection and whom to warn first, but it protects lives only if it is updated and enforced.

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The 1999 Odisha super cyclone and the 2004 tsunami pushed India from relief after disasters to reducing risk before them; the Sendai Framework (2015-2030) then replaced the Hyogo Framework for Action (2005-2015) as the global blueprint.

Measures before Sendai

• Law and institutions: the Disaster Management Act, 2005 created the National, State and District Disaster Management Authorities; the National Disaster Response Force followed in 2006 and the National Policy on Disaster Management in 2009.
• Hazard-specific action: NDMA guidelines for cyclones, earthquakes and floods, cyclone shelters and improved forecasting, the tsunami early-warning system at INCOIS (2007), building codes and mock drills.

Measures after Sendai

• The National Disaster Management Plan, 2016, India's first, aligned with Sendai's priorities and assigned roles to every ministry.
• The Prime Minister's ten-point agenda (2016) on risk reduction, and India's hosting of the Asian Ministerial Conference on DRR in 2016.
• Gaps that persist: uneven State capacity, weak urban planning and building-code enforcement, thin local funds, and mitigation and insurance lagging behind response.

Sendai versus Hyogo

• Targets: Hyogo set five priorities but no measurable goals; Sendai, adopted on 18 March 2015, has four priorities and seven global targets with indicators.
• Focus: Hyogo centred on building resilience to natural hazards; Sendai aims to prevent new risk and reduce existing risk, and covers natural and man-made hazards, including biological ones.
• Governance: Sendai stresses risk governance, accountability and an all-of-society partnership, and adds 'build back better' to preparedness and recovery.
• Priorities: understanding risk, strengthening risk governance, investing in resilience, and better preparedness for effective response and recovery.

India has strong institutions for response and is moving towards risk reduction; Sendai's targets and risk-governance ideas call for stronger local action and resilient infrastructure.

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A monsoon-dependent economy, a coastline of about 7,500 km and a glaciated Himalaya make India one of the countries most exposed to a warming climate.

Impact on India as a whole

• Monsoon and farming: more variable rain, fewer rainy days with heavier bursts, floods and droughts in the same year; heat during grain filling hurts wheat and rain-fed kharif crops suffer, threatening food security and farm incomes.
• Water: stress on rivers and groundwater sharpens inter-State and rural-urban conflict.
• Health: more intense heat waves, malaria and dengue spreading to new areas, and lost productivity for outdoor workers.
• Economy and ecology: damage to roads, power and cities from extreme events, higher cooling demand, forced migration; coral bleaching, shifting forest types and species loss; a large poor and farm-dependent population has little capacity to adapt.

Himalayan states

• Glaciers and rivers: retreat first swells and then reduces the flows of the Indus, Ganga and Brahmaputra, disturbing irrigation and hydropower downstream.
• Hazards: glacial lake outburst floods, cloudbursts and landslides, as in the Kedarnath disaster of 2013; longer dry spells raise forest-fire risk, as in Uttarakhand in 2016.
• Livelihoods: apple belts in Himachal Pradesh shift uphill, snow-dependent tourism turns uncertain, and fragile roads are repeatedly cut.

Coastal states

• Sea-level rise: erosion, submergence of low islands in the Sundarbans and Lakshadweep, and saline intrusion into the Ganga, Mahanadi, Krishna-Godavari and Cauvery deltas, ruining farmland and drinking water.
• Cyclones and surges: stronger storms, as with Phailin (2013) and Hudhud (2014), threaten Odisha, Andhra Pradesh, Tamil Nadu and Gujarat; urban floods as in Chennai (2015) grow costlier.
• Fisheries and mangroves: warming shifts fish stocks and bleaches corals, hitting fishing communities.

Response

• The National Action Plan on Climate Change (2008) with its mission on the Himalayan ecosystem, State action plans, cyclone early warning, climate-resilient crops, and India's 2015 pledge to cut the emissions intensity of GDP by 33 to 35 per cent by 2030 from 2005 levels and reach about 40 per cent non-fossil power capacity.

India must mitigate through clean energy and adapt through resilient farming, disaster preparedness and protection of the Himalaya and the coast, where the damage arrives first.

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On 26 December 2004 a great earthquake off Sumatra sent a tsunami across the Indian Ocean; India, with no warning system, lost more than ten thousand lives on its eastern coast and islands.

Why tsunamis occur

• Subduction earthquakes: most tsunamis follow shallow, high-magnitude quakes where one plate is thrust under another and the seabed is suddenly lifted, displacing the whole water column; the 2004 event occurred at the boundary of the Indian and Burma plates.
• Other triggers: submarine landslides, volcanic collapse (Krakatoa, 1883) and, rarely, meteorite impact.
• Amplification on arrival: waves slow and rise in shallow water; funnel-shaped bays, flat low coasts and the loss of mangroves and dunes let them run far inland.
• India's exposure: the Andaman-Sumatra arc in the east and the Makran zone in the Arabian Sea.

Effects on life and economy

• Life: deaths concentrated in Tamil Nadu, with Nagapattinam worst hit, the Andaman and Nicobar Islands, Andhra Pradesh, Kerala and Puducherry; fishing villages wiped out, families displaced for years, and women and children disproportionately among the dead.
• Economy: boats, nets and harbours destroyed, ending fishing incomes overnight; ports, roads, power lines and the Car Nicobar air base damaged; farmland and wells salinised; tourism collapsed and rebuilding absorbed public funds for years.

Preparedness under NDMA guidelines (2010)

• Early warning: the Indian Tsunami Early Warning Centre at INCOIS, Hyderabad, links seismic stations, bottom-pressure recorders and tide gauges to issue alerts within minutes; last-mile dissemination by siren, radio, SMS and local officials.
• Risk assessment and land use: inundation and vulnerability maps for every coastal district; coastal zoning, setback lines and tsunami-resistant building codes; elevated shelters and vertical evacuation in dense areas.
• Bio-shields: mangroves, casuarina belts and dune restoration along exposed coasts.
• Community readiness: awareness campaigns, school curricula, mock drills, marked evacuation routes and trained village response teams.
• Institutions: clear roles for NDMA, State and district authorities under the Disaster Management Act 2005, NDRF battalions on the coast, hospital preparedness and periodic review of plans.

India now has the warning system it lacked in 2004; what remains is to make coastal communities, buildings and land use as ready as the sensors.

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Mumbai in 2005 and Chennai in 2015 showed that heavy rain becomes a disaster when a city builds over its drains, lakes and floodplains; NDMA's 2010 guidelines treat urban flooding as a distinct hazard.

Reasons for urban floods

• Climate: more intense short-duration rainfall, convective downpours over the urban heat island, and in coastal cities storm surge and high tides that block outfalls.
• Land use: encroachment on lakes, wetlands, floodplains and natural drains, and paved surfaces that stop infiltration and speed run-off.
• Drainage: storm drains built for low rainfall, silted, clogged with waste, mixed with sewage and rarely maintained.
• Upstream releases: sudden discharge from reservoirs without warning downstream, as in Chennai in 2015.
• Governance: many agencies with no single flood authority, weak enforcement of master plans and building norms, and no local flood-risk maps.

Preparedness mechanisms

• Know the risk: ward-level flood hazard mapping and zoning, Doppler weather radars and dense automatic rain gauges, and IMD nowcasts turned into city-specific warnings.
• Protocols: reservoir operation rules with advance warning before releases, a single nodal authority for urban floods, and an incident response system fixing who does what.
• Drains and water bodies: drainage master plans using updated rainfall data, pre-monsoon desilting, separation of sewage from storm water, and restoration of lakes and wetlands.
• Sponge measures: rain gardens, permeable pavements, rainwater harvesting and protected green spaces that make room for water.
• Response readiness: early warning by SMS and media, control rooms, standard operating procedures, trained municipal and SDRF/NDRF teams, pumps, identified shelters and evacuation routes, and protection of hospitals and power supply.
• Community and finance: ward volunteers, mock drills, public education and flood insurance, with enforcement action after every event.

Making room for water through restored wetlands, better drains and land-use control, backed by early warning and trained responders, is the surest way to cut urban flood risk.

Written by Minimalist IAS from facts checked at source (how we verify) — a little fuller than exam length, so every part of the question is covered; in the hall, keep the structure and trim the detail. UPSC publishes no model answers: compare your structure and coverage with this, then write your own.

A cloudburst is a sudden fall of very heavy rain, about 100 mm or more within an hour over a small area of 20-30 sq km, which in Uttarakhand's steep, debris-laden valleys turns into flash floods and landslides, as at Kedarnath in June 2013 and in Pithoragarh and Chamoli in July 2016.

Why the damage is so high

• Cloudbursts cannot yet be forecast precisely, so losses depend on where and how people build: on river terraces and unstable slopes, along pilgrim routes, with road cutting and hydropower muck adding loose debris to swollen streams.

Measures in line with NDMA guidelines

• Hazard zonation: village-scale landslide and flash-flood zonation, mapping of streams, glacial lakes and unstable slopes, with the maps binding on land-use plans and building permissions.
• Regulation: no construction in river beds, floodplains and on unstable slopes; hill-specific building codes; controlled road, hydropower and tourism projects with safe muck disposal; carrying-capacity limits on pilgrim traffic.
• Early warning: dense automatic weather stations and Doppler radars, rainfall thresholds that trigger alerts, and last-mile dissemination to villages and pilgrims through sirens, mobile alerts and local channels.
• Structural and ecological: slope stabilisation, retaining walls, drainage and check dams, bio-engineering and afforestation with native species on catchments, and natural stream channels kept clear.
• Preparedness and response: community-based disaster plans and trained village volunteers, mock drills, SDRF and NDRF units pre-positioned during the monsoon, safe shelters, satellite phones and helipads for evacuation, and stocked relief.
• Recovery: build back safer, relocate settlements from high-risk sites, insurance and livelihood support, and follow-up on the recommendations of every post-disaster review, which NDMA's guidelines on floods and on landslides both stress.

In the Himalaya safety lies in where and how we build; hazard maps, enforced regulation, timely warning and trained communities together turn a cloudburst from a catastrophe into a manageable event.

Written by Minimalist IAS from facts checked at source (how we verify) — a little fuller than exam length, so every part of the question is covered; in the hall, keep the structure and trim the detail. UPSC publishes no model answers: compare your structure and coverage with this, then write your own.