70% work on training wall at Cooum estuary

The ₹70-crore project is expected to reduce formation of sand bars at the confluence point 

Updated - October 01, 2023 01:18 am IST

Published - September 23, 2023 08:16 pm IST - CHENNAI

The concrete tetrapods being placed at the Cooum river mouth on Saturday as part of the project to build a training wall.

The concrete tetrapods being placed at the Cooum river mouth on Saturday as part of the project to build a training wall. | Photo Credit: M. SRINATH

The flow of floodwater at the Cooum river mouth may be quicker during the northeast monsoon this year as work on a major portion of the training wall has been completed.

The Water Resources Department has completed 70% of the training wall, a structure to direct the flow, on either side of the Cooum river mouth.

The ₹70-crore project, when completed, would reduce the formation of sand bars at the confluence point of the river and the sea.

Sand deposits at the mouth had been a challenge in flood management.

The presence of Chennai harbour nearby had accelerated the formation of sand bars, the officials said.

The department started building the training wall perpendicular to the sea to enable permanent opening of the river mouth. Built using a combination of boulders and concrete tetrapods, work had been finished to build the first layer of boulders on both sides.

Boulders sourced from Madurantakam have been laid for a length of 310 metres on the southern side and 265 metres on the other side. Concrete tetrapods were being placed as the top layer to prevent the movement of boulders during the rainy season. About 4,500 tetrapods would be placed for the training wall, the officials said. The height of training wall would be nearly 8 metres at its deepest portion and would enhance tidal action and prevent coastal erosion.

The department is continuing the dredging operation in the river to clear the accumulated silt deposits to widen the river mouth to up to 120 metres. Nearly 1.20 lakh cubic metres of sand had been removed so far. The remaining 56,000 cubic metres of sand would soon be cleared.

After the project is completed in December, the portion of the river up to Chetpet may feel the impact of the tidal exchange. Now, the impact had reached only up to Chintadripet. The river has a capacity to carry up to 35,000 cusecs of water.

0 / 0
Sign in to unlock member-only benefits!
  • Access 10 free stories every month
  • Save stories to read later
  • Access to comment on every story
  • Sign-up/manage your newsletter subscriptions with a single click
  • Get notified by email for early access to discounts & offers on our products
Sign in


Comments have to be in English, and in full sentences. They cannot be abusive or personal. Please abide by our community guidelines for posting your comments.

We have migrated to a new commenting platform. If you are already a registered user of The Hindu and logged in, you may continue to engage with our articles. If you do not have an account please register and login to post comments. Users can access their older comments by logging into their accounts on Vuukle.