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Floods And Droughts In India Pdf

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An objective numerical drought index based on monthly monsoon rainfall and duration has been developed for assessment of drought intensity. The drought intensity equation serves the dual purpose of assessing the intensity of drought as well as flood.

Flood and Drought Management through Water Resources Development in India

Availability of freshwater globally however, is limited. Out of the 2. The distribution of the water thus available is not uniform and is highly uneven in both space and time. Due to hydrological, topographical and geological limitations, however, only km3 of surface water can be utilized by conventional storage and diversion structures. The annual recharge of groundwater is km3. Two major problems faced by the country are drought and floods, which are discussed in the succeeding paragraphs:.

Today, droughts and floods are a common feature and their co-existence poses a potent threat, which cannot be eradicated but has to be managed. Transfer of the surplus monsoon water to areas of water deficit is a potential possibility. This would also help create additional irrigational potential, the generation of hydropower, as well as overcoming regional imbalances.

The recurrence of drought and famines during the second half of the 19th century necessitated the development of irrigation to give protection against the failure of crops and to reduce large-scale expenditure on famine relief. Floods are recurrent phenomena in India. Due to different climatic and rainfall patterns in different regions, it has been the experience that, while some parts are suffering devastating floods, another part is suffering drought at the same time.

With the increase in population and development activity, there has been a tendency to occupy the floodplains, which has resulted in damage of a more serious nature over the years.

Often, because of the varying rainfall distribution, areas which are not traditionally prone to floods also experience severe inundation. Thus, floods are the single most frequent disaster faced by the country. Flooding is caused by the inadequate capacity within the banks of the rivers to contain the high flows brought down from the upper catchments due to heavy rainfall.

Flooding is accentuated by erosion and silting of the river beds, resulting in a reduction of the carrying capacity of river channels; earthquakes and landslides leading to changes in river courses and obstructions to flow; synchronization of floods in the main and tributary rivers; retardation due to tidal effects; encroachment of floodplains; and haphazard and unplanned growth of urban areas.

Some parts of the country, mainly coastal areas of Andhra Pradesh, Orissa, Tamil Nadu and West Bengal, experience cyclones, which are often accompanied by heavy rainfall leading to flooding. About 80 per cent of this area, i. More significant than the loss of life and damage to property is the sense of insecurity and fear in the minds of people living in the floodplains. Highlights of the damage are given below:. Drought is a recurrent natural feature which results from the lack of precipitation over an extended period of time e.

It is a temporary deviation of rainfall and moisture conditions from the mean, thus differing from aridity and seasonal aridity. It is a creeping phenomenon and, unlike other hazards, can last for months and, in severe cases, years.

Drought affects virtually all climatic regions and more than one-half of the Earth is susceptible to droughts every year. Regions with higher variability of rainfall and runoff are more vulnerable. Depending on the likely impact, the phenomenon of drought can be categorized in several ways, such as meteorological, hydrological and agricultural. The spatial extent of drought is much greater than for any other hazard and is not limited to basin or political boundaries.

Long- lasting droughts lead to degradation of soil, plant and animal habitats and social disruption. It includes about 39 per cent of cultivable land and about 29 per cent of our population. This would require some million tones of food grain annually. The basic needs for water of rural and urban populations and cattle, as well as industry and environment and ecological management, also have to be met, taking into account land-use policies, degradation of water resources, depletion of aquifers, etc.

The strategy for mitigating the effects of drought and floods is the optimal development of scarce water resources. After independence, planned development of water resources was taken up mainly through the creation of storage projects, as well as extension, renovation and modernization of existing projects.

So far, storage capacity of some billion m3 has been created in the country and projects under construction will increase this to billion m3. At the central level, the Union Ministry of Water Resources is responsible for development, conservation and management of water as a national resource, i. It also oversees the regulation and development of inter-state rivers.

These functions are carried out through various central organizations. Urban water supply and sewage disposal is handled by the Ministry of Urban Development, while rural water supply comes under the purview of the Department of Drinking Water under the Ministry of Rural Development. The subject of hydro-electric and thermal power is the responsibility of the Ministry of Power.

Pollution and environment control comes under the purview of the Ministry of Environment and Forests. Water being a state subject, the state government has primary responsibility for use and control of this resource.

The administrative control and responsibility for development of water rest with the various state departments and corporations. The National Water Policy adopted by the National Water Resources Council in April highlights the provisions for project planning, surface- and groundwater development, irrigation and flood control. Irrigation plays a major role in increasing the production of food grains. The policy provides following directives for irrigation management:.

The following provisions exist in National Water Policy as regards flood control and moderation:. River-valley projects serve a basic necessity of a country whose economy is based largely on agriculture. Irrigation and power are crucial inputs for increased productivity. A high priority has, therefore, been given in the national planning process to the creation of river-valley projects ever since India gained independence.

As stated earlier, of all natural disasters, drought affects the greatest number of people in the world, especially in India. The occurrence of drought cannot be prevented but being well prepared for its likely occurrence can lessen its impacts.

Droughts have two basic components: climatic decrease in precipitation and demand use of water. In responding to droughts, governments tend to concentrate most of their efforts on reducing the demand for water, although there are limited options for controlling the climatic component.

Thus, drought-planning strategies should have a clear objective and purpose; involve stakeholder participation; have a good inventory of resources; identify groups at risk; be able to integrate science and technology with policy; publicize the proposed plan and invite public responses; and have an appropriate education programme.

The long-term measures for drought mitigation would normally include creation of ground- and surface-water storages, integration of small reservoirs with major reservoirs, integrated basin planning; inter-basin transfer of water, etc.

Long-term adaptation involves the development of community-based natural resources management plans, developed and implemented through a participatory approach, and making full use of traditional knowledge. Water used for irrigating fields near Maniyampadi. The water comes from a diesel engine driven pump and is also used for drinking and cooking. Thus, most measures focus on management, re-allocation and distribution of existing water resources and on establishing priorities accordingly for different uses.

Commonly known means adopted for combating drought and promoting development are:. Many major, medium and minor water-resources projects have been constructed over the past six decades. Sustained efforts so far have ensured considerable progress, but there is still a long way to go to ensure water for all in adequate quantity and quality. The problems are further compounded by fresh issues that have surfaced over the last few years.

The behaviour of the monsoon is usually erratic and uncertain in India. Kharif summer crop production depends on the quantum and distribution of rainfall. The behaviour of monsoon is broadly classified as:. The preparations for dealing with such situation, which is necessary to maintain from year to year, are:.

It is the creeping effect of drought over long periods and its severity that sensitized the Government of India to treat the problem from several angles—scientific, technological, economic, social and environmental. Some of the initiatives taken for drought management by the Government are:. Approaches to dealing with floods may be any one or a combination of the following available options:. The main thrust of the flood protection programme undertaken in India so far has been an attempt to modify the flood in the form of physical structural measures to prevent the floodwaters from reaching potential damage centres and modify susceptibility to flood damage through early warning systems.

The following structural measures are generally adopted for flood protection:. Of these measures, embankments are the most commonly undertaken in order to provide quick protection with locally available material and labour.

These embankments play an important role in providing reasonable protection to vulnerable areas. Realizing the great potential of the reservoirs in impounding floods and regulating the flows downstream for flood moderation, flood control has been sought to be achieved as one of the objectives in multipurpose dams. Reservoirs with a specifically allocated flood cushion have been constructed on the Damodar system in Jharkhand and the Hirakud and Rengali dam in Orissa.

However, many other large storage dams, e. Bhakra dam, without any earmarked flood storage, have also helped in flood moderation. These large dams have played a significant role in reducing damage by way of flood moderation. One of the important flood moderation examples achieved by dams is that of Damodar Valley, where four reservoirs were constructed with flood management as one of the objectives.

During the monsoon, DVC reservoirs saved the life and property of people from a possible disaster through flood moderation. Barring occasional breaches in embankments, these works gave reasonable protection to an area of some A brief description of the most important measure, i. As for the strategy of laying more emphasis on non-structural measures, a nationwide flood forecasting and warning system has been established by the Central Water Commission.

Flood forecasting and flood warning in India commenced in a small way in the year with the establishment of a unit in the Central Water Commission, New Delhi, for flood forecasting for the river Yamuna at Delhi. This has now grown to cover most of the flood-prone interstate river basins.

The forecasts issued by the Central Water Commission have been consistent with about 96 per cent accuracy as per the present norms of the Central Water Commission. The Central Water Commission is making a constant endeavour to update and modernize forecasting services on a continuous basis to make flood forecasts more accurate, effective and timely.

Initiatives being taken for modernizing flood forecasting services are:. India has traditionally been vulnerable to natural disasters on account of its unique geoclimatic conditions. Floods, droughts, cyclones, earthquakes and landslides have been recurrent phenomena.

The loss in terms of private, community and public assets was astronomical. Over the past couple of years, the Government of India has effected a paradigm shift in its approach to disaster management. The new approach derives from the conviction that development cannot be sustainable unless disaster mitigation is built into the development process.

Another cornerstone of the approach is that mitigation has to be multi-disciplinary, spanning all sectors of development. The new policy also emanates from the belief that investments in mitigation are much more cost-effective than expenditure on relief and rehabilitation. The steps being taken by the Government emanate from the approach outlined above. This has been translated into a National Disaster Framework roadmap covering institutional mechanisms, a disaster prevention strategy, early warning systems, disaster mitigation, preparedness and response and human resource development.

Hazards of Floods and Droughts in India

A drought is an event of prolonged shortages in the water supply, whether atmospheric below-average precipitation , surface water or ground water. A drought can last for months or years, or may be declared after as few as 15 days. Periods of heat can significantly worsen drought conditions by hastening evaporation of water vapour. Drought is a recurring feature of the climate in most parts of the world. However, these regular droughts have become more extreme and more unpredictable due to climate change. In fact studies based on dendrochronology , or tree rings dating, confirm that drought affected by global warming goes back to


About 43% of the Indian population is prone to recurrent floods [2]. The northeast monsoon period (November to March) has mainly dry weather.


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Natural and Man-Made Hazards pp Cite as. India is a land of monsoons of which the South-West Monsoon is a wet monsoon while the North-East Monsoon is a dry one. Yet the rainfall produced by them is not uniformly distributed either in space or in time which therefore leads to the occurrence of floods and droughts in different parts of the country from time to time. While floods are confined to restricted areas based on the distribution of the major river systems, droughts are only on account of rainfall failures following late onset or early withdrawal or both of the monsoons.

Vedantu academic counsellor will be calling you shortly for your Online Counselling session. Related Questions. Which parts of India experience floods and droughts?

Hazards of Floods and Droughts in India

A drought is an event of prolonged shortages in the water supply, whether atmospheric below-average precipitation , surface water or ground water. A drought can last for months or years, or may be declared after as few as 15 days. Periods of heat can significantly worsen drought conditions by hastening evaporation of water vapour.

India essentially forms a separate geo-hydrological and climatic unit due to its isolation from the rest of the Eurasian landmass. Thus, the problems of floods and droughts in India form a distinct unit of study while studying global climatic and water regimes. However, in the age of humans, the anthropological factor has come to dominate discussions on disasters. In the last two years, there have been devastating floods in the Kosi-Ganga plains in Bihar, Brahmaputra plains in Assam and West Bengal, urban flooding in Chennai and erratic flooding during monsoons in central India.


They have been the scourge of mankind since times immemorial; while droughts hit food production mainly through water scarcity, floods disrupt national economy.


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Availability of freshwater globally however, is limited. Out of the 2. The distribution of the water thus available is not uniform and is highly uneven in both space and time. Due to hydrological, topographical and geological limitations, however, only km3 of surface water can be utilized by conventional storage and diversion structures. The annual recharge of groundwater is km3.

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Natural and Man-Made Hazards pp Cite as. India is a land of monsoons of which the South-West Monsoon is a wet monsoon while the North-East Monsoon is a dry one. Yet the rainfall produced by them is not uniformly distributed either in space or in time which therefore leads to the occurrence of floods and droughts in different parts of the country from time to time.

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Floods are recurrent phenomena in India. Due to different climatic and rainfall patterns in different regions, it has been the experience that, while some parts are​.

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