Surface Water

The study deals with the estimation of hydrological soil properties of the area of Lokapavani River in KR Sagar Command in Mandya district of Karnataka. The properties determined are soil texture, porosity, saturated hydraulic conductivity, specific gravity and soil moisture characteristics.

The disturbed and undisturbed soil samples from eighteen locations along different depths were collected and analyzed. Eighty-five disturbed soil samples were used to determine the grain size distribution, porosity, specific gravity and soil moisture characteristic curves with the help of electromagnetic sieve shaker, master sizer, GeoPyc and pressure plate apparatus. Twenty undisturbed soil samples were used to determine saturated hydraulic conductivity with ICW Permeameter.

The study conducts an extensive water quality survey in sixteen reaches of Kali river in western Uttar Pradesh to estimate the inflow of two major nutrients (nitrate and phosphate) from point and non-point sources. The study intends to validate the present model based on the principle of conservation of mass and reaction kinetics phenomenon.

Data was taken for one annual cycle on a monthly basis and criteria developed to compute the non point source load from nine sub-basins in various stretches of the river. The computed loads at each section obtained from the predictive equation have been compared with the values observed in the field. The performance of the developed equation has been evaluated using percentage error estimation and correlation statistics. Remote sensing and geographical information systems (GIS) have been used to develop correlation between basin characteristics and non-point source loads.

Small and big dams and big embankments were constructed in this region, without understanding the nature of the rivers which have always changed course or overshot their banks. Assuming however, that the river will not change course, the Government adopted a skewed development program - that of building embankments to contain the river.

The Renuka Dam Project proposed over the river Giri Ganga (a tributary of the Yamuna) located some 300km away from Delhi, is a joint project of the governments of Himachal Pradesh (HP) and Delhi, to be constructed by the Himachal Pradesh Power Corporation Limited (HPPCL) in Sirmaur district of HP.

The naturally undulating terrain of Bangalore city, with its hills and valleys, lends itself perfectly to the development of lakes that impound rainwater, store it for future use and ensure ground water recharge. Lakes are thus live ecological systems, and play a crucial role in the supporting life, including human.

Lakes in Bangalore were designed in cascades from higher to lower elevations; as a lake overflowed the excess water would flow into the next lake in the cascade. The flow of water is from North to South-east as well North to South-west along the natural gradient of the land.

This set of maps of Indian towns and cities, dated between 1893 and 1924, give an idea of historical water bodies in each town/city, and can be compared with present day maps, to discover water bodies, that may have been lost to urban encroachments or other human interventions.

The presentation from the ENVIS - CES (IISc) website, emphasises the important role that the tank system has played in the development of the city of Bangalore and highlights:

•  The principles behind the working of the tank system
• The process of evolution of the tank system with respect to the growth of the city
• The underlying planning principles that were used in the tank system
• The role and importance of water tanks as an asset to the city
• The relationship between the system of tanks and the city of Bangalore
• The usefulness of the tanks as an important source of drinking water and agriculture in lean periods

These two documents from the KSPCB website, provide monthly water quality status data, for the rivers Tungabhadra, Cauvery and Kabini, monitored between January to June 2007, at various points along the rivers.

The data recorded are Temperature, pH, Dissolved Oxygen (DO), Biochemical Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Faecal Coliform.

As per the Press Information Bureau's press release, the Union Cabinet has approved the proposal of the Ministry of Water Resources for enacting The Dam Safety Bill, on May 13 2010. The Bill is to be introduced in the Parliament.

The main objectives of the legislation are:-

• The new legislation will help the States in adopting uniform dam safety procedures which shall ensure safety of dams and safeguard benefits from such dams.

This brief article by Prof Jayanta Bandyopadhyay in the May 16-31 2010 issue of Business Economics magazine, highlights the recent plans of the central and state goverments of constructing a large number of dams on Himalayan rivers. Environmentalists continue to consistently argue against the construction of dams that are built without respect for ecological sciences and warn that this could lead to increase in disasters in the fragile Himalayan region.