Yesterday’s 10-million-gallon water eruption in Westwood was just the latest and biggest such calamity for LA’s Department of Water and Power. In 2009, a water-main break created a sinkhole that nearly swallowed a fire engine. Two years later, there was a chain reaction from Northridge to North Hollywood. Last year, it was Northridge again, and Tarzana, and this year there were breaks in Hollywood, in Venice and near LAX. Mark Gold says this won’t be the last. He’s a Professor and Acting Director of UCLA’s Institute of the Environment and Sustainability.