Gabion grade walls are being constructed to strengthen a section of the Kollidam river bank in Ambele

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The gabion wall is currently being constructed on the banks of Kollidam river in Anbil near Tiruchi. |Image source: Special arrangement

Construction of the gabion wall on the banks of Kollidam river in Anbil near Tiruchi is expected to be completed within a month.

Construction of the gabion wall on the banks of Kollidam river in Anbil near Tiruchi is expected to be completed within a month. |Image source: Special arrangement

The Water Resources Department has started construction of gabion grade walls on the vulnerable stretch of the Kollidam bund in Anbil and plans to build a similar structure at Kariyamanickam near Tiruchy to strengthen the bund. Kollidam is an important flood vector in the state.

In recent years, the embankments of these two river sections have been severely eroded by sewage discharges many times. On at least two occasions — in October 2022 and between July and August of this year — the WRD had to shore up sections of the river with boulders when large amounts of water were released from the river. In 2022, vertical landslides were reported on river banks.

After the erosion incident in August this year, Additional Chief Secretary, Water Resources Department K. Manivasan inspected the Kariyamanikam site and directed officials to submit recommendations for permanent protective measures to prevent recurrence of such erosion in future .

In an effort to find a permanent solution to the recurring problem, the department proposed constructing gabion walls, which are large cage/box-like structures filled with rocks held together by wire mesh to help prevent Erode and maintain slopes.

long term solution

WRD sources said the wall, made of stacked granite, would be a long-term solution to protect the river banks from damage during peak river flows hinduism.

Construction of gabion walls on the left bank of the Ambir river is underway as part of the flood control project at an estimated cost of around Rs 683 crore. The wall under construction is about 150 meters long. Sources said more than 75% of the work has been completed and the rest is expected to be completed within a month.

The department has submitted a proposal to the government for the construction of a gabion grade wall of approximately 380 meters in length at Kariyamanickam near Upper Anikat (Mukkombu). It is expected to cost around Rs 15 crore. The government is expected to impose sanctions soon, sources said.

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