The Bangalore Water Supply and Sewerage Board is currently executing phase-II of stage-IV of the Cauvery water supply and sewerage project at an estimated cost of Rs 3,384 crore. "The Japan Bank for International Cooperation is funding the project to the extent of Rs 2,830 crore. The balance cost of Rs 554 crore will be borne equally by the Centre and the state. The entire project is expected to complete by early 2013," a BWSSB spokesperson told Projectmonitor.
The project, approved by the Karnataka government in 2005, consists of 13 water supply and 11 sewerage contract packages as well as distribution and management improvement components. The two packages are expected to be completed by 2011-12 and 2012-13, respectively. The project envisages the provision of 500-mld water supply and 405-mld sewerage facilities, including water and sanitary connections to about 362 slums and provision of Scada for existing treatment facilities and water pumping stations.
In particular, the water supply component involves the transfer of raw water by gravity over a 15-km long distance to a 540-mld treatment plant and pumping the treated water in three stages to reservoirs over a distance of 100 km. Likewise, the sewerage component entails laying trunk sewers over 90-km length and constructing intermediate pumping stations, pumping mains of 25 km, and a 400-mld sewage treatment plant.
The project is still in the tendering stage though contracts for small works are already underway.
BWSSB has invited tenders for 12 works including raw water transfer, water treatment plant, a transmission line from TK halli to Bangalore, city trunk mains, and city reservoirs and pumping stations, the official said. Steel Authority of India Ltd, which was awarded the steel plate supply contract, has delivered 65 per cent of the MS plates required for the transmission mains.
Bids for the construction of clear water reservoirs and pump houses, electromechanical equipment and accessories at TK halli, Harohalli and Tataguni are currently under evaluation while those for water treatment plant, feeder mains, transmission mains and city reservoirs are yet to be opened.
The board also invited prequalification for five sewer pipeline rehabilitation works out of which it received bids for three works. However, it is evaluating bids for the distribution improvement component.
One of the works underway is repackaging of sewage treatment plants with intermediate sewage pumping stations.
Phase-I of stage-IV of the Cauvery water supply and sewerage project was completed in 2004. JBIC provided Rs 985 crore out of the total project cost of Rs 1,072 crore; the balance was funded by BWSSB, Bangalore Development Authority and Bruhath Bengaluru City Corporation. The project envisages supplying 270 mld of water to Bangalore city and included source works on Cauvery river, water treatment plants, forwarding pumping stations, and transmission to service reservoirs. The first three stages of the Cauvery project yielding 540 mld of water was commissioned long ago.