Lena, the district’s water warden, stood on the catwalk circling its iron belly, a stethoscope pressed to the riveted steel. Nothing. Not the gurgle of inflow, not the whisper of outflow. Just the dry, hollow echo of her own knocking.
She radioed the valley. “Water’s back. Go boil your pasta.” airlock in water tank
“Airlock,” she muttered, tapping a gauge that read zero pressure. Somewhere inside the million-gallon beast, a bubble of trapped air had decided to become a king. It sat fat and stubborn at the highest point of the outlet pipe, a cushion of atmospheric defiance that no amount of incoming water could push past. The pump house below would be screaming itself hoarse, pushing water against an invisible door. Lena, the district’s water warden, stood on the
“Or,” she said, “we let the bubble sit there for a week, and they lose it anyway, slower and more painfully. Pipes will start collapsing from vacuum. Pumps will burn out. A bubble of air is patient. We can’t be.” Just the dry, hollow echo of her own knocking
For thirty seconds, the tank sang. Then the shriek became a wet choke, and a thin, tentative stream of water trickled over the hatch lip. Lena looked at the gauge. Pressure was climbing.
She closed the hatch. The pump house below changed pitch—from a scream to a steady, contented roar. Water was moving.