One of Calgary's busiest downtown parkades will remain closed for up to eight months while extensive flood damage is repaired.

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Flood damage at the Civic Plaza Parkade will take months to fix, officials say. (CBC)

All seven levels of the Civic Plaza Parkade at 322 Ninth Avenue S.E. filled up with flood water in last month’s flooding.

Using massive pumps lowered to level six through the air shaft, crews drained about 75 million litres of water out of the structure, said Calgary Parking Authority operation and facility manager Dean Bell.

"You can tell by the water level that every inch that could be filled with water was filled with water down here," he said.

Several tests need to be done to make sure the parkade is still structurally sound.

"One of the bigger things that we have to look at that we haven’t studied yet are the beams. They’re post-tension cable in those beams and those react not at all well to water," Bell said.

The building’s elevators, lighting and ventilation systems will all have to be replaced.

Insurance will cover the cost of repairing the parkade.