Basement floods in city store.
Two fire crews had to be called to pump out the water and fire officers estimated there could be as much as two million litres of water in the basement, said shop manager Kerry Malone.
The fire engines were called out at 9.50am yesterday and were at the scene for three hours, helping to deal with the incident.
Although the water did not affect the shop floor and the business was able to remain open, stock was damaged.
Ms Malone said: "The stock room floor was four inches deep and we could not use the kitchen or toilets all day.
"The lift shaft and lower basement are still filled with water and the fire men said they did not know exactly how much was down there.
Ms Malone said United Utilities had said the flood was caused by a burst water main