State Bureau, Dehradun. Sonar wave based survey was conducted for 48 hours to solve the mystery of long-running water leakage in the head race tunnel of 304 MW capacity Maneri Bhali Phase-2 Hydroelectric Project.
After the survey report comes, it will be decided what is the size of the leakage in the tunnel, how many months will the tunnel remain closed for repair and what will be the method of repair.
At present, about 1,500 liters of water per second is leaking from the tunnel. This leakage poses a threat to the project as well as the surrounding land and slopes. Due to this, power generation is affected and monitoring of the project has been increased.
This was earlier also investigated inside the tunnel through a remotely operated vehicle. An attempt was made to stop the leak by grouting (cement-chemical injection). But the leakage did not stop completely, necessitating a new technical investigation. Now information about the leakage is being collected from sonar survey.
Techniques used in sonar survey
How many months will the tunnel remain closed
The exact timing will depend on sonar reports, but experts' initial assessment is that if the leakage is from limited cracks then it could last for 3 to 6 months.
If structural weakness is found then the work can be carried out for 6 to 9 months and if a large fault zone is detected then it can be carried out for 9 to 12 months, but Uttarakhand Jal Vidyut Nigam Limited is trying to carry out the repair work without closing the tunnel.
'Uttarakhand Jal Vidyut Nigam Limited is looking for a way to carry out the repair work without closing the tunnel, the complete picture will be clear after the sonar survey report comes.' --AK Singh, Director Operation, UJVN Limited.
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