NEW ORLEANS — Louisiana State University’s dental school in New Orleans is closed because the main building’s basement flooded over the weekend, shutting down the computer network and phones.

Heavy rains Saturday left 1½ feet (about half a meter) of water in the basement, LSU Health Sciences Center New Orleans spokeswoman Leslie Capo said in a news release Monday. She said the school and main clinic would remain closed Tuesday but hope to reopen Wednesday.

A clinic across the street remained open. It sees an average of 15 to 20 patients a day, compared to 300 to 400 at the main clinic, Dean Henry Gremillion (GREM-ee-yon) said.

Because the computer network was down, dental clinic staffers did not have any way to reach patients to tell them appointments were canceled.

Gremillion said the dental school is completing a move to new electronic and electrical equipment in an above-ground annex built with Hurricane Katrina mitigation grants from the Federal Emergency Management Agency. Katrina struck New Orleans in 2005.

“The bottom floor is covered parking, so any significant functions or equipment will be above that,” he said.

The annex is expected to open in January, and the school began transferring operations to the new equipment months ago, Gremillion said.

“Most of that transfer has been completed. Unfortunately, this is just the last portion of it,” he said.