Southern States - Karnataka-Bangalore   

BWSSB may try trenchless technology

By Our Staff Reporter

BANGALORE Feb. 12. The World Bank-funded Mumbai Sewerage Disposal Project undertaken by the Municipal Corporation of Greater Mumbai was completed in August 2002. This project used trenchless technology (TT) like micro-tunnelling and jacking techniques to connect sewer links.

Trenchless technology involves micro tunnelling and jacking techniques where the underground utilities (pipelines, sewers) can be laid or rehabilitated without disturbing the ground surface.

This technique is supposed to reduce the cost compared to conventional techniques such as manhole construction using manpower. TT minimises or eliminates the need for excavation of open-cut trenches.

V.Nagarajan, Planning Engineer, Arabian Jacking Enterprises For Contracting And Trading Co. (Aject) told The Hindu that nearly 42 per cent of water was lost during supply from the reservoir to the end consumer in Bangalore. The water loss termed "Unaccounted For Water" (UFW) occurs because of leaks and other factors.

The UFW has forced the Bangalore Water Supply and Sewerage Board to take up a major project work in old areas of the City such as Ulsoor.

The BWSSB is likely to use the TT technique for rectifying the "Unaccounted For Water" problem.

It has called in tenders from global TT firms to control the UFW. Aject has submitted its bid for this project. The Arabian company will open its office in Bangalore soon, said Mr. Nagarajan.

Within six years, the awareness of TT has spread rapidly with expansive implementation, Niranjan Swarup, Executive Director, Indian Society for Trenchless Technology, said. However, lack of trained manpower was an impediment.

The Government needed to endorse use of trenchless technology, introduce TT as a subject in the syllabi of construction-related sciences.

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