
All about world’s longest irrigation tunnel in Telangana, a part of which collapsed trapping eight
The Hindu
Srisailam Left Bank Canal tunnel in Telangana collapses trapping 8; rescue efforts by multiple organizations underway.
A part of the Srisailam Left Bank Canal (SLBC) of Alimineti Madhava Reddy project collapsed on Saturday (February 22, 2025) trapping eight people. Rescue efforts by multiple Central, State and other organisations are part of the rescue operation. An agreement to build the SLBC tunnel was made in 2005 during the regime of late Y.S. Rajashekar Reddy. This is also World’s longest irrigation tunnel. Here are details of the tunnel, its potential uses, how did it collapse and rescue operation underway.
Where is it being constructed?
On the left bank of the Srisailam Reservoir in Telangana
Why is it being constructed?
The tunnel would draw 30 tmc ft of water to irrigate four-lakh acres in Nalgonda and Khammam district
How long is it?
It stretches for 44 kms from Srisailam to Devarakonda. Works on 35 kilometers is already completed. It has a height of 30.7 feet after completion (lining of the tunnel). After the Tunnel Boring Machine (TBM) drills, 360 degrees of the tunnel is lined with prefabricated cement blocks to prevent collapse, seepage. The tunnel is 400 metres below the Amrabad Tiger Reserve.