Books and Book Reviews

This publication by the Central Water Commission presents data on Major and Medium Irrigation and Multipurpose projects, Minor Irrigation projects, Command Area Development scheme as available in the Finance A

It attempts at compiling information on various component processes of hydrology and their interaction. The report has been divided into nine chapters dealing with different aspects of hydrology.

Like other sciences, the science of water too was well developed in ancient India. The report regrets that at present sufficient attention is not paid to our ancient Indian sciences. The study of Sanskrit literature indicates valuable references to hydrology and important concepts of modern hydrology are scattered in various verses of Vedas, Puranas, Meghmala, Mayurchitraka, Vrhat Sanhita and various other ancient Indian works. 

Some of the key references are as follows –

• In vedic age, Indians had developed the concept that water gets divided into minute particles due to the effect of sun rays and wind. At various places in the Puranas it is alluded that water cannot be created or destroyed and that only its state is changed through various phases of hydrological cycle.
• Evaporation, condensation, cloud formation, precipitation and its measurement were well understood in India in vedic and puranic times.
• Effect of yajna, forests, reservoirs etc., on the causation of rainfall, classification of clouds, their colour, rainfall capacity etc, forecasting of rainfall on the basis of natural phenomenon like colour of sky, clouds, wind direction, lightning, and the activities of animals was well developed in ancient India well before 10th century BC.
• Contrivances to measure rainfall were developed during the time of Kautilya (4th century BC) which had the same principle as that of modern hydrology except the fact that weight measure (of drone, paia etc.,) were adopted instead of modern linear measurement of rainfall.
• Scientific facts like arid region of Tibetan rain shadow area and no rainfall by polar winds was discussed in the puranas. The knowledge of monsoon winds and height of clouds along with the division of atmosphere was well developed in vedic age.
• The technique of knowing the slope of an area by means of a flowing river and dimensions of meandering rivers along with velocity of flow were developed.
• In ancient times, Indians had well developed concepts of groundwater occurrence, distribution and utilization. Literature also reveals that hydrologic indicators such as physiographic features, termite mounds, soils, flora, fauna, rocks and minerals were used to detect the presence of groundwater.
• Variation in the height of water table with place, hot and cold springs, ground water utilization by means of wells, well construction methods and equipment are fully described in chapter 54 of Vrhat Sanhita (Bruhat Samhita) named as ‘Dakargala’. The fact that sun rays, winds, humidity, vegetation etc are the major causes of evapotranspiration was well realized.
• Varamihira in as early as 550 AD presented a simple method for obtaining potable water from a contaminated source of water. Various plant materials along with the sun heating, aeration, quenching of water with fire heated stones, gold, silver, iron or sand were used. The change in the quality of water with the months of year and suitability of water from different sources for various uses were described.
• Efficient water use, lining of canals, construction of dams, tanks, essential requirements for the construction of good tanks, bank protection methods, spillways and other minor aspects were given due consideration in ancient times in India.
• Well organized water pricing system was prevalent during the times of Kautilya.
• Various references are available in the Vedas alluding the importance of efficient water use so as to reduce the intensity of water scarcity and drought.

The book covers 16 chapters addressing various applications starting with introduction, state of art technology, case studies, literature review, future trends besides providing relevant references which are more useful for operational scientists and researchers. The resource scientists from Remote sensing & GIS applications area have contributed these chapters.

In his last book, 'Economics of hydropower' Dr. jhunjhunwala comes to a conclusion that we have neglected some very important costs of hydropower, while overestimating its benefit.

It underlines, in this regard, the importance of a responsible municipal fiscal and financial system, simplification of existing water pricing and tariff structures, and regulatory mechanisms which are able to balance the interests of the producers and consumers of urban services.

Dr. Bharat Jhunjhunwala, past faculty at IIM, Bangalore, holds a doctorate in Economics.  He has been working persistently on economic impacts of hydropower dams, applying the concepts of environmental economics to arrive at some interesting results.

His latest book, ‘Economics of River Flows: Lessons from Dam Removals from America’ analyses dam decommissioning examples from the United States and raises some pertinent questions about costs benefit analysis of dams in India. His earlier book, ‘Economics of Hydropower’ raised questions about economic efficiency, viability and sustainability of Hydropower Dams in India.

Parineeta Dandekar, IWP, talks with him on some of these issues.

Dr. Bharat Jhunjhunwala can be contacted at: bharatjj@gmail.com