The National Geophysical Research Institute (NGRI) has submitted a comprehensive survey report on the structural integrity and subsurface conditions of the Srisailam left bank canal (SLBC) to Telangana Irrigation Minister N Uttam Kumar Reddy. This submission marks a significant milestone in ensuring the safety of ongoing tunnel works.
Advanced Geophysical Techniques Used
The report, presented by NGRI chief scientist HVS Satyanarayana during a review meeting on Friday, employs advanced geophysical techniques such as seismic imaging and electrical resistivity tomography. These methods enabled the detection of stress zones, seepage patterns, and tunnel roof stability issues that conventional inspections could not identify. The findings also shed light on the factors behind the roof collapse that occurred on February 22, 2025.
Government Commitment to Safety
Minister Uttam Kumar Reddy emphasized the government's commitment to worker safety, stating that scientific inputs from NGRI would guide decisions on tunnel completion. He praised the institute's work and requested its involvement in soil investigations at the Medigadda, Annaram, and Sundilla barrages of the Kaleshwaram lift irrigation project, where rehabilitation is planned. "The report will be thoroughly examined, and necessary measures will be initiated based on its recommendations," he said.
Acceleration of Tunnel Works
The minister directed irrigation officials to fast-track SLBC tunnel works by mobilizing equipment from domestic agencies alongside machinery being procured overseas. Progress so far stands at 151.5 metres, with imported electric loaders and heavy dumpers recently added to the fleet. Officials expect excavation to accelerate, targeting 200 metres per month from each side. The Bureau of Indian Standards-backed geophysical survey is considered critical to preventing further accidents and ensuring project completion.
About the Author
Koride Mahesh has been working with the Times of India, Hyderabad for over two decades. He is currently senior assistant editor of TOI, Hyderabad. He holds a PhD in Journalism and has a total of 32 years of experience in print journalism. He extensively writes on urban infrastructure, projects, civic issues, real estate market, land issues, energy, irrigation, and state government administration in Telangana. He also covers state political developments, especially BRS.
