Deccan Chronicle 01.09.2009
River diversion to quench city thirst?
Bengaluru, Aug. 31: For years Bengaluru has depended on the river Cauvery and the TG Halli reservoir for its drinking water supply. Now it could have a third source of supply, if the government decides to divert west flowing rivers, including the Netravathi from nearly 300 km away, to provide water to the city and seven other districts.
An eight-year-old report on river diversion prepared by engineer G.S. Paramasivaiya, which has been lying in cold storage since, suggests building of 37 small dams and two “garland canals” along the western face of the Western Ghats to divert the flow of the rivers for the benefit of farmers, towns and cities. Bengaluru, which is already making near optimum use of Cauvery water, obviously needs to consider other options to meet the needs of its growing population and the Paramasivaiya report could hold the key to its future source of supply.
According to the report, the west flowing Netravathi river water, which has been wastefully draining into the sea, can be diverted to feed Bengaluru and other areas. It estimates that about 90.73 TMC can be diverted to 40 drought affected taluks in seven districts. Fortunately, the report finally seems to have caught the imagination of the administration which now appears to be considering it. A senior officer of the department points out that drinking water will be the next big concern for growing cities like Bengaluru. “We are already over utilising the Cauvery and after the completion of the last stage of that drinking water scheme, the city will need to look at other options. As no move has been made to link rivers of north and south India, we must at least encourage use of water from our own rivers for our people,” he says, however, cautioning that this must be done only after taking care to protect the environment and human settlements enroute.
The Paramasivaiya report has suggested diverting west flowing streams and rivers such as Netravathi and Kumaradhara to the east to provide drinking water to Bengaluru city and its outskirts, Chikmagalur, Hassan, Mandya, Tumkur, and Kolar districts. It also suggests recharging the ground water by using existing tanks as storage dams.
While the diversion of the rivers will not unsettle habitats enroute on as big a scale as other irrigation and drinking water projects have done, it could threaten the ecology of the Western Ghats, fear conservationists.
But the project, which presents the tempting prospect of providing drinking water to 107 lakh people and 102.74 lakh livestock, besides decreasing the farmers’ dependence on rainfall, may win over such concerns.
The fact that it aims to recharge the ground water in drought prone districts of the state by using the existing tanks to store excess river water could also recommend it highly to the authorities.
But whether this will be enough for them to clear the dust off the report and seriously consider its recommendations, is another story altogether. Residents can only hope for an early brainstorming on the water crisis that is threatening to arrive at their doorsteps soon.
