26-05-2025
Kaleshwaram: L&T, Afcons write to government on NDSA report
Hyderabad: After the National Dam Safety Authority (NDSA) submitted its final report suggesting investigations, repairs and rehabilitation works at Medigadda, Annaram and Sundilla barrages of the Kaleshwaram lift irrigation scheme (KILS), L&T-PES JV, which constructed Medigadda, and AFCONS-VIJETA-PES-JV, which constructed Annaram barrage, have written to the govt on the investigations and rehabilitation.
The state govt earlier shared the NDSA report with the agencies seeking their opinion on going ahead with repairs and rehabilitation of the three barrages.
Medigadda barrage contractor L&T has said there were certain inconsistencies in the NDSA final report on various issues. In the letter (May 24), L&T said there were contradictory points in the report, including inadequacy in geo-technical investigations for design to find out the variability of the foundation strata and related geotechnical uncertainties, deficiencies in model studies by TSERL, inadequacy in hydraulic and structural design aspects, specifically regarding the design of energy dissipation mechanisms and structural components, lapses in operation and maintenance (O&M), absence of an O&M manual, lack of quality control and O&M challenges, non-compliance with provisions of the Dam Safety Act, 2021.
For instance, on the quality control issues, it had submitted to the NDSA in March last year itself along with reports on quality control manual report submitted to irrigation department in 2016, method statement for secant pile made as quality manual handover to the irrigation department during the construction, proof of regular quality checks and also irrigation department and customer satisfaction report issued by the department on quarterly basis and third party quality checks.
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The letter quoted the reports and, in the executive summary of the report, the NDSA commented "lack of quality control measures during construction of the secant pile cutoffs. No quality control procedures were implemented to ensure the water tightness of the cutoff walls," the agency said.
Afcons, which constructed Annaram barrage, said the NDSA has recommended holistic rehabilitation design, which includes detailed assessment of the structural health and safety of the barrages, comprehensive geo-technical studies and advances geo-physical assessment, etc.
For carrying out that, the agency asked the irrigation department to engage an irrigation department designer or qualified agency and design consultant for taking up rehabilitation works as suggested by the NDSA. It also asked drilling pattern, depth, diameter, location of holes etc., to be drilled for geo-technical studies and other investigations. "After finalisation and approval of the design and drawings, the contractor is also prepared to execute the construction under a separate agreement," the letter on May 23 said.
Afcons also requested the govt to release 176 crore pending payment, 4.45 crore towards NDSA recommended interim measures and works and also release 43 crore back guarantee.
