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Disaster management

6 Solved Questions with Answers
  • 2019

    8. Vulnerability is an essential element for defining disaster impacts and its threat to people. How and in what ways can vulnerability to disasters be characterized? Discuss different types of vulnerability with reference to disasters.

    According to United Nation Office of Disaster Risk Reduction (UNDRR), Vulnerability can be defined as the conditions determined by physical, social, economic and environmental factors or processes, which increase the susceptibility of an individual, a community, assets or systems to the impacts of hazards.

    Vulnerability assessment needs to be based on a systematization and conceptualization of vulnerability describing the main linkages between the different components of risk. Only if the population and decision makers know where and how vulnerable the system is and which social–economic, physical, and environmental factors play a major role in it, adequate measures can be implemented to reduce vulnerabilities to disasters. It involves two approaches:

    • Scientific Approach: It includes the research line of practical measurement approaches of vulnerability and disaster risk reduction.
    • Policy Approach: It provides information about the spatial distributions of vulnerability to different natural hazards upon which the authorities need to take actions.

    Different Types of Vulnerability

    • Physical Vulnerability: The potential for physical impact on the physical environment – which can be expressed as elements-at-risk (EaR). The degree of loss to a given EaR or set of EaR resulting from the occurrence of a natural phenomenon of a given magnitude and expressed on a scale from 0 (no damage) to 1 (total damage)”.
      • For Example: A wooden house is sometimes less likely to collapse in an earthquake, but it may be more vulnerable in the event of a fire or a hurricane.
    • Economic Vulnerability: The potential impacts of hazards on economic assets and processes (i.e. business interruption, secondary effects such as increased poverty and job loss) vulnerability of different economic sectors.
      • For Example: Families with low incomes often live in high-risk areas around cities, because they can’t afford to live in safer (and more expensive) places.
    • Social Vulnerability: The potential impacts of events on groups such as the poor, single parent households, pregnant or lactating women, the handicapped, children, and elderly; consider public awareness of risk, ability of groups to self-cope with catastrophes, and status of institutional structures designed to help them cope.
      • For Example: Women and children are more vulnerable to disasters as compared to men.
    • Environmental Vulnerability: The potential impacts of events on the environment (flora, fauna, ecosystems, biodiversity).
      • For Example: People living in the tropical areas are more vulnerable to tropical cyclones as compared to people living in temperate region.

  • 2016

    15. The frequency of urban floods due to high intensity rainfall is increasing over the years. Discussing the reasons for urban floods, highlight the mechanisms for preparedness to reduce the risk during such events. (2016)

    Flooding and disruption have become the new normal for the monsoon season in urban India. Recent water logging in Gurgaon, urban flood in Mumbai and Srinagar shows the increasing intensity of urban flood disasters in India. These are some of the reasons of urban floods in case of Indian cities.

    • A special feature in India is heavy rainfall during monsoons. There are other weather systems also that bring in a lot of rain. Storm surges can also affect coastal cities/ towns.
    • The urban heat island effect has resulted in an increase in rainfall over urban areas. Global climate change is resulting in changed weather patterns and increased episodes of high intensity rainfall events occurring in shorter periods of time.
    • Stormwater drainage systems in the past were designed for rainfall intensity of 12–20 mm. These capacities get easily overwhelmed whenever rainfall of higher intensity is experienced. Further, the systems very often do not work to the designed capacities because of very poor maintenance.
    • Encroachments are also a major problem in many cities and towns. The flow of water has increased in proportion to the urbanization of the watersheds. Ideally, the natural drains should have been widened (similar to road widening for increased traffic) to accommodate the higher flows of stormwater. But on the contrary, there have been large scale encroachments on the natural drains and the river flood plains. Consequently the capacity of the natural drains has decreased, resulting in flooding.
    • Improper disposal of solid waste, including domestic, commercial and industrial waste and dumping of construction debris into the drains also contributes significantly to reducing drainage capacities.
    • Presence of impervious cover near trees and on road pavements also reduces water runoff.

    To reduce these risk following measure can be taken:

    • Pre-Monsoon Desilting of drainage system.
    • Solid waste disposal and its proper management has significant effect on drainage performance and reduces the chances of choking of drainage system.
    • Protection and conservation of wetlands near urban habitats increase the water holding capacities and they also act as natural barriers against any surge in water level.
    • Rain water harvesting reduces the load of excess rain water of rain and help in mitigating urban floods.

  • 2016

    16. With reference to National Disaster Management Authority (NDMA) guidelines, discuss the measures to be adopted to mitigate the impact of recent incidents of cloudbursts in many places of Uttarakhand. (2016)

    Cloudburst is a short-term extreme precipitation of 10 cm or above rainfall in an hour which occurs over a small area.

    When saturated clouds are unable to produce rain because of the upward movement of warm current of air leading to excessive condensation, raindrops are carried upwards by the air current instead of dropping as rainfall. After a point raindrops become too heavy to be carried upwards and drop together in a quick flash. This phenomenon is known as cloudbursts.

    Rainfall does not directly cause death but the consequences of the cloudbursts in the form of rainfall triggers landslides, flash floods, houses and establishment getting swept and cave in lead to death and damage. Restoring settlements near mountain foothills is difficult due to flashfloods that might happen from cloudburst.

    Ways to minimise the loss of life and property

    Detecting cloud bursts is a difficult task as it covers small areas so precaution will go a long way in lessening the damage.

    • Stopping haphazard construction in hilly areas.
    • Preventing encroachments of riverbeds.
    • Afforestation programmes specially on hill slopes to prevent landslides.
    • Alert-relay system (Early warning system) should be put in place so that people can evacuate on time.

    The damaged ground must be replanted as soon as possible since erosion caused by loss of ground soil cover can lead to flash flooding and additional landslides in the near future.

    Space Application Centre (SAC) of ISRO has developed a model for heavy rainfall/cloud burst alert to prevent the damage caused by a cloudburst. It is currently working on pilot basis but once its effectiveness is proven, it will go a long way in saving lives.

  • 2019

    18. Disaster preparedness is the first step in any disaster management process. Explain how hazard zonation mapping will help disaster mitigation in the case of landslides.

    Disaster preparedness refers to measures taken to prepare for and reduce the effects of disasters i.e. to predict and prevent disasters, mitigate their impact, and respond to and effectively cope with their consequences. These are achieved through programs that strengthen the technical and managerial capacity of governments, organizations, and communities.

    Disaster preparedness is a continuous and integrated process resulting from a wide range of risk reduction activities and resources. It is considered as the first step in any disaster management process as it involves:

    • Risk assessment (to point out which measures to implement) and early warning systems
    • Life safeguarding equipment, for example, cyclone shelters
    • Resources and emergency kits in anticipation of need, maintaining emergency rosters and evacuation plans, emergency information and communication systems
    • Training to ensure adequate emergency response capacity, maintenance of preparedness levels, public education and preparedness campaigns

    That said, hazard zonation mapping is one of the disaster preparedness mechanisms to mitigate the risks associated with landslides. Landslides involve mass movement of loose soil and uncompact rock materials under the effects of gravity along a sliding plane.

    According to a recent study, India is among the most landslides affected countries, accounting for at least 28% of such events in the past 12 years. In such a scenario, hazard zonation mapping will help disaster mitigation in the case of landslides.

    • Landslide hazard zonation (LHZ) mapping refers to the division of land into homogeneous areas and ranking of these areas according to their degrees of actual or potential hazard caused by landslides and mass movements.
    • The susceptibility of a given area to landslides can be determined and depicted using hazard zonation. Once landslide susceptibility is identified, intervention projects can be developed which avoid, prevent, or substantially mitigate the hazard.
    • These maps provide important information to support decisions for urban development and land use planning. Also, effective utilization of these maps can considerably reduce the damage potential and other cost effects of landslides.
    • The LHZ maps identify and delineate unstable hazard-prone areas, so that environmental regeneration programmes can be initiated adopting suitable mitigation measures.
    • Even if the hazardous areas cannot be avoided altogether, their recognition in the initial stages of planning may help to adopt suitable precautionary measures.

    Landslides and their consequences are still a great problem for many countries, particularly in India due to rapidly increasing populations. The most recent example being that of Kerala. For this reason, landslide hazard zonation mapping serves as one of the many components in an integrated disaster management planning.

  • 2018

    18. Describe various measures taken in India for Disaster Risk Reduction (DRR) before and after signing 'Sendai Framework for DRR (2015-30)'. How is this framework different from ‘Hyogo Framework for Action, 2005’? (2018)

    Disaster leads to sudden disruption of normal life, causing severe damage to life and property. Its origin can be natural or man-made. India due to its geography and scarce resources is more prone to Disasters.

    In order to manage disaster, prior to the signing ‘Sendai Framework for DRR (2015-30)’ in 2016, India has taken following steps:

    • The Disaster Management Act was enacted in 2005, which ushered in a paradigm shift from a relief-centric approach to a more proactive regime that laid greater emphasis on preparedness, prevention and mitigation.
    • The National Policy on Disaster Management (NPDM) has been prepared in pursuance of the Disaster Management Act, 2005, which laid the framework/roadmap for handling disasters in a holistic manner.
    • In 2016, India released the country’s first ever National Disaster Management Plan, a document based on the global blueprint for reducing disaster losses, the Sendai Framework for Disaster Risk Reduction. It will cover all phases of disaster management, from prevention and mitigation to response and recovery.

    India is the largest democracy which has adopted the Sendai framework for disaster risk reduction and the first country to have drawn a national and local strategy with a short term goal achievement target set for 2020.

    The difference between Hyogo Framework and Sendai Framework is:

    • The Sendai Framework (2015-30) is the successor instrument to the Hyogo Framework for Action (2005-15).
    • The Hyogo framework was the first plan which explained, described and detailed the work that is required from all different sectors and actors to reduce disaster losses.
    • Sendai framework recognizes that the State has the primary role to reduce disaster risk but that responsibility should be shared with other stakeholders including local government, the private sector and other stakeholders.

  • 2017

    18. On December 2004, tsumani brought havoc on fourteen countries including India. Discuss the factors responsible for occurrence of tsunami and its effects on life and economy. In the light of guidelines of NDMA (2010) describe the mechanisms for preparedness to reduce the risk during such events. (2017)

    On December 26, 2004 the gigantic tsunami waves generated due to a great undersea earthquake off the coast of Banda Aceh, northern Sumatra. This earthquake occurred along a thrust fault in the subduction zone where the Indian tectonic plate was going below the overriding Burmese plate. As a result, the ocean floor broke and there was a vertical displacement of about 15 to 20 meters along the fault causing large scale displacement of water and thus, generating tsunami waves.

    • Typically, for an average ocean depth of 4 km, like in the Indian Ocean/Bay of Bengal region, the speed of the tsunami waves can go up to 720 km/h or about the speed of a jet airliner. As the tsunami waves approach the shore, the water depth becomes shallower, waves slow down, wavelength becomes shorter and the waves gain larger amplitude or heights and become destructive.

    Effect on life and economy

    • Tsunami waves destroy boats, buildings, bridges, cars, trees, telephone lines, power lines - and just about anything else in their way. Once the tsunami waves have knocked down infrastructure on the shore they may continue to travel for several miles inland, sweeping away more trees, buildings, cars and other man made equipment. Small islands hit by a tsunami are left unrecognizable.
    • After a tsunami strikes, landscapes that previously constituted picturesque beaches or seaside towns become a wasteland. In addition to the destruction of human construction, tsunamis destroy vegetation such as trees, resulting in landslides and coastlines that slip into the sea as deep root systems that previously held land in place are ripped out.

    Preparedness in light of NDMA Gudelines

    • The 2004 tsunami prompted NDMA to formulate Tsunami Risk Management Guidelines to outline inter-agency roles and responsibilities, tsunami risk preparedness, mitigation and response. 
    • In order to reduce risk of tsunami it is pertinent to explore options for effective dissemination of tsunami alert and warning messages generated by INCOIS to the concerned agencies and coastal vulnerable communities exposed to tsunamis in a coordinated manner.
    • Structural Mitigation measures, as envisaged in the Guidelines, gives a brief guidance on design and construction of new structures as well as strategies for protecting lifeline and priority structures from tsunamis along the seafront.
    • A robust techno-legal regime through efficient land use practices, bioshields, shelter belt plantation and mangrove regeneration with community involvement will also help towards the cause.

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