MONTREAL — A Montreal health network diverted ambulances from its facilities, including the Royal Victoria Hospital, and cancelled outpatient and surgical appointments after a water main break early Friday left its superhospital site without drinkable water. McGill University Health Centre says the "major aqueduct failure" early Thursday night has left all facilities without potable water at its Glen site in the city's Notre-Dame-de-Grâce borough. Along with Royal Victoria Hospital, the aqueduct failure also affects Cedars Cancer Centre, Montreal Chest Institute, Montreal Children's Hospital and the Research Institute of the MUHC.

The Glen site is considered a "superhospital" because it is composed of several medical centres. A City of Montreal spokesman said Friday that authorities first learned of the water main break about 1:30 a.m.

but waited until about 7:30 a.m. to shut the valve to give the hospital flexibility and allow it to continue operating as long as possible.

"The hospital only has half the water pressure they usually get, it's not sufficient to ensure the hospital will be able to conduct all their normal operations," said Philippe Sabourin. Sabourin says the leak in the 12-inch pipe will be found and repaired, an operation that could take about a day. Road traffic in the area is closed while the work is done.

"The main concern at this point for the city is to provide enough (water) pressure in the network of the MUHC so the hospital can return to normal ope.