Water pumps failed in fire, officials say
Equipment failures Nov. 15 caused fire hydrants to go dry in highest neighborhood of Yorba Linda.
Water officials said Tuesday that pumps designed to push water to the upper reaches of a hillside Yorba Linda neighborhood failed during a Nov. 15 firestorm, possibly explaining why firefighters were forced to abandon the area and let homes burn after fire hydrants went dry.
The disclosure came four days after Orange County fire officials blamed the loss of as many as five homes in the neighborhood on lack of water from fire hydrants.
More than 180 homes were destroyed or damaged when fire tore through Yorba Linda, 19 of them in the upper Hidden Hills Estates neighborhood where firefighters encountered the dry hydrants. The ridge-top homes border Chino Hills State Park, 14,100 acres of oaks and dry grasslands.
Agency officials had said they believed the dry hydrants were caused by the overwhelming water demands of such an intense and widespread firefighting effort.
But on Tuesday, officials described a frantic afternoon and evening in which, little by little, they learned from media reports, fire authorities and their own inspection crews that neighborhood fire hydrants had gone dry, electronic communications had failed and pumps expected to help deliver the water had shut down.
The problems first surfaced at 1:22 p.m., when the water district's computer system lost communication with Santiago Reservoir and a nearby pump station, which together supply water to the neighborhood of about 110 homes for residential use and for hydrants, Yorba Linda Water District Assistant General Manager Ken Vecchiarelli told reporters Tuesday.
The electronic communication lapse lasted 24 hours.
Then, after seeing television news reports about 3 p.m. detailing a lack of water in the Hidden Hills area, district officials started to ask other agencies, including the Orange County Fire Authority, if they were having water problems. They initially said no, Vecchiarelli said.
At 4:15, a water district crew made it up to the burned-out Santiago pump station to find three electric pumps and a gas-powered backup had shut down. Workers then checked fire hydrants one by one, finding that while some still had water pressure, the highest ones had run dry. Water officials believe the electric pumps shut off because the fire had burned through their electrical communication systems. The backup, they said, failed because of the heat.
Workers were able to restart the pumps manually but later had to shut them off because too much air -- and not enough water -- in the system was causing them to vibrate.
