Leakage is reduced by 90 pc, which was 300 times the limit
Pune: Just 15 years after its inception, the Temghar dam started leaking 300 times the permissible leakage limit of a dam, which is 70 litre/second. Now after repair works, when the leakage has been reduced by 90 per cent since 2016, officials of Water Resources Department (WRD) are planning to call the dam repair methodologies as ‘Temghar Pattern.’
In the last one year of repair work of dam, which mainly includes grouting technology, officials were successful in reducing the leakage from 2,147 litres/ second to 208 litres/ second.
Pravin Kolhe, the Superintendent Engineer at Water Resources Department, agreed that the quality of the dam was compromised during construction, which caused the leakage.
“In normal conditions, a dam should at least last for 100 years. There were several lacunae while building the dam, which led to the leakage. However, in past one year, after a good research, the dam’s leakage has been reduced drastically. Officials worked day and night to fix the issue and the results are open for analysis,” added Kolhe.
Officials of WRD said that the grouting mixture was prepared and tested at the Central Water and Power Research Station (CWPRS), Pune. The mixture contains 80 per cent cement, 19 per cent fly ash and one per cent silica.
Kolhe said that many officials across Maharashtra are visiting the dam to study the repair procedures, which will help them in future. According to WRD officials, they have done the testing of grouting mixture in a simulated environment with similar water pressure as a dam of four TMC capacity has to sustain.
The 87-metre-high dam in Mutha river has a capacity of holding water up to four TMC and was built between 1997 and 2001. It is one of the four dams apart from Panshet, Varasgaon and Khadakwasla, which supplies water to Pune city. While funds of Rs 95 crore have been allocated for the dam repair, till now, Rs 37 crore has been spent on the repair work.