Cofferdam works of Polavaram to be launched in December

The Water Resources department is preparing to launch major works related to upstream and downstream cofferdams of Polavaram project by early December.

Published: 10th November 2018 08:15 AM  |   Last Updated: 10th November 2018 08:15 AM   |  A+A-

By Express News Service

VIJAYAWADA: The Water Resources department is preparing to launch major works related to upstream and downstream cofferdams of Polavaram project by early December. While the preliminary works have already begun, officials said, the cofferdams are likely to be ready in six months time. The State government has promised to release water from the project, through gravity, by mid-2019.

While the foundation for the cofferdams —  jet grouting — has been completed, the officials are now in the process of mobilising necessary men and machinery for launching the major works. “The preliminary works are already underway, but we expect to launch the major works by December 15,” Polavaram project Chief Engineer (CE) V Sridhar told TNIE. According to the officials, while 58 lakh quantities (units) of material works have to be done for the upstream cofferdam, the lower cofferdam has 25 lakh quantities of rock, soil, fine and coarse material works.

The CE said the uneven surface on the surface of the jet grout columns, which the project detractors alleged were due to poor quality of construction, was the residue. “The actual jet grout columns are below the surface. The uneven part is called residue, which is the excess part formed, while bringing the jet grouting machine to a halt. Since the machine, which runs at a pressure of 400 to 500 bar, can’t be brought to a halt immediately; the pressure is tapered down slowly, which results in the residue,” Sridhar said.

The representatives of Keller India, which has done jet grouting, explained that a daily quality audit was a part of their functioning. “The machines we used have Data Acquisition (DAQ) software and we transfer it to our teams in Australia and the US, which examine the parameters thoroughly,” one of the representatives said.

The CE added, the government conducts periodical quality checks. “There is a Quality Control wing in our department, then there is Water and Power Consultancy Services Ltd, the project consultant appointed by the Centre, and there are Polavaram Project Authority and Central Soil and Material Research Station. We also have experts from IIT, Madras, for quality inspections. So, there is no scope for lapses in quality of the execution,” he said.

Stay up to date on all the latest Vijayawada news with The New Indian Express App. Download now
(Get the news that matters from New Indian Express on WhatsApp. Click this link and hit 'Click to Subscribe'. Follow the instructions after that.)


Disclaimer : We respect your thoughts and views! But we need to be judicious while moderating your comments. All the comments will be moderated by the editorial. Abstain from posting comments that are obscene, defamatory or inflammatory, and do not indulge in personal attacks. Try to avoid outside hyperlinks inside the comment. Help us delete comments that do not follow these guidelines.

The views expressed in comments published on are those of the comment writers alone. They do not represent the views or opinions of or its staff, nor do they represent the views or opinions of The New Indian Express Group, or any entity of, or affiliated with, The New Indian Express Group. reserves the right to take any or all comments down at any time.

flipboard facebook twitter whatsapp