A 72 inch diameter water supply pipeline busted Saturday due to power breakdown causing suspension of water supply to many localities of Karachi. The line supply 100 million gallon water daily to the metropolis from Dhabeji. The water board management has initiated the repair work of the broken water supply line urgently, sources said. The repair work will be completed within 12 to 18 hours, the board officials said. The power outages in Karachi have damaged the water board installations several times causing disruption of water supply in the metropolis.