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Monday, Sep 26, 2022

15% extra cut in water supply after city loses 2 mn litres in twin pipeline bursts

Two pipelines burst today,extending what has become a series of such incidents,casing the wastage of 2 million litres in a city already short of water,and leading to a steeper supply cut than the one already in force.

Two pipelines burst today,extending what has become a series of such incidents,casing the wastage of 2 million litres in a city already short of water,and leading to a steeper supply cut than the one already in force.

For the next 36 hours,the existing supply cut of 15 per cent will go up by an additional 15 per cent across the city. That is the time the BMC expects to take to fix one of the burst pipelines (in Mulund). The other pipeline,in Thane,is expected to take 24 hours to repair.

Officials said pressure fluctuations had caused the old pipes to burst but admitted that it could also have been caused by lack of coordination between officials operating the valves inside the pipeline.

The Tansa East pipeline burst near ESIS Hospital in Mulund,and the Tansa West pipeline near Kapurbawdi in Thane. The 72-inch pipelines carry water from the Tansa Dam to Bhandup complex where it is treated and distributed. The pipelines are over 90 years old.

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Officials said pressure fluctuated inside the pipelines after the hydraulic engineering department had isolated supply to certain stretches on both the East and the West pipelines to repair an earlier rupture,caused near Bhiwandi on March 15,and to repair other minor leakages. Supply was short by around 550 million litres Thursday because of the isolation; the usual supply is 2900 million litres a day.

“When we closed the valves inside the pipelines to isolate them,the pressure of water in the stretch that was not isolated increased greatly and caused them to burst. These steel pipelines are very old and have corroded over time. The base of the pipelines have become very thin because of the constant contact with water and give way when the pressure increased,” said hydraulic engineer V P Deshpande.

The isolation was started at 11 am and the pipes burst just after noon. Valves need to be closed in various stages and at synchronised times,an official said,adding improper closing could have caused the pipes to burst.

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“Closing of valves inside pipelines lead to pressure variations. It is a tricky business and has to be handled properly. If done without proper coordination,it can considerably increase the pressure of water at certain points causing the pipeline to burst,” said the official.

The stretch from Goregaon to Dahisar did not get water as the ruptured Malad tunnel was isolated. The dysfunctional valves will now be replaced and CCTV cameras inserted to asses the extent of damage caused.

Rs 1,200 cr more for storm water project
“Additional Central assistance to the tune of Rs 1,200 crore has been sanctioned for Brihanmumbai Storm Water Drainage System Project (BRIMSTOWAD),of which Rs 400 crore was released in 2007-08 and Rs 100 crore released in 2008-09 and Rs 400 crore released in the year 2009-10,” Finance Minister Sunil Tatkare said while presenting the budget today.

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“The work on laying,renovation and strengthening storm water drains in the city is on in full swing and when completed the revamped drainage system will be capable of draining away the storm water generated by rains having intensity of 50 millimetres per hour ensuring a flood-free Mumbai city. An outlay of Rs 200 crore is proposed in the financial year 2010-11 for this project,” he added.

First published on: 26-03-2010 at 12:14:31 am
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