Water from the iconic Mettur Dam in the Salem district of Tamil Nadu, which is traditionally released on June 12 every year, has faced a significant delay this season due to an underperforming monsoon. To support the crucial paddy crops in the delta region, Chief Minister C. Joseph Vijay is scheduled to officially open the dam gates on Tuesday, September 1, 2026.

With the current water level hovering around 90 feet, the water will be discharged for approximately 45 days. This duration is deemed absolutely vital for the survival of the Kuruvai paddy crop, which has been under stress due to the prolonged dry spell along the Cauvery basin.

The Rich History of Mettur Dam

The construction of the Mettur Dam began in 1925 and was completed in 1934, employing over 17,000 workers. The massive project required the evacuation of several villages, including Nayambadi. To this day, when the reservoir's water level recedes during dry periods, the submerged ruins of the old Christian Church of Nayambadi and the Nandhi statue of the Jalagandeeswarar temple become visible, drawing curious onlookers.

Conceived nearly a century ago by the legendary British irrigation engineer Sir Arthur Cotton, the dam was designed by Colonel W. M. Ellis and constructed under the supervision of Irish engineer Vincent Hart. The public park situated at the foot of the dam is named in honor of Mr. Ellis. The project was funded through taxes collected under the Madras Presidency, initiated by Sir C.P. Ramaswamy Iyer, who then headed the Board of Revenue.

Why This Matters

BozokMedia analysis shows that the delay in water release directly threatens the agricultural yield of Tamil Nadu's food bowl. The 12 delta districts, including Thanjavur and Tiruvarur, rely heavily on the 230-day water cycle starting June 12. A delay of nearly three months forces farmers to rely on expensive borewells and erratic groundwater resources, increasing production costs and risking crop failure.

The dam stands at a maximum height of 214 feet and has a width of 171 feet, spanning a total length of 1,700 meters. With a maximum capacity of 93.47 tmcft, the reservoir receives its primary inflows from its own catchment areas as well as the Kabini and Krishna Raja Sagar (KRS) dams located upstream in Karnataka.

Around 16.05 lakh acres of agricultural land across 12 crucial districts—including Tiruchi, Thanjavur, Tiruvarur, Cuddalore, Nagapattinam, Erode, Pudukkottai, Ariyalur, Perambalur, Karur, Mayiladuthurai, and Namakkal—rely directly on the Mettur Dam's water release for their livelihood.

"The delayed release from Mettur Dam is a double-edged sword; while it saves the immediate Kuruvai crops, the government must ensure an uninterrupted three-phase power supply so farmers can utilize borewells effectively," says C. Varadharaj, president of the TMC (Mooppanar) farmers wing.

The Mettur Surplus Water Scheme

To mitigate water scarcity, the ₹565 crore Cauvery Surplus Water Scheme was initiated in April 2020 by former Chief Minister Edappadi K. Palaniswami. The project aims to channel surplus water to fill lakes and tanks in Mettur, Omalur, Edappadi, and Sankari constituencies. The DMK government, which took charge in 2021, expedited the remaining works, allocating ₹108 crore in 2023. By 2025, the surplus water was successfully pumped to 60 lakes, though further funding is required to complete the network.

Frequently Asked Questions

Q1: Why is the water release from Mettur Dam delayed in 2026?
A1: The release was delayed due to a poor monsoon season, which resulted in lower-than-normal inflows into the reservoir from its catchment areas in Karnataka and Tamil Nadu.

Q2: How many districts benefit from the Mettur Dam?
A2: A total of 12 districts benefit from the water release, covering approximately 16.05 lakh acres of agricultural land.