A massive, underground floodway is being built to help Toronto cope with the flooding that has devastated parts of the city and has forced thousands to evacuate.

The $2.2 billion plan is one of the largest in Canada to address the flooding, which is expected to hit about 20 per cent of the area.

There is a big concern that the flood will be too large for any city to deal with.

The Toronto Transit Commission is running a pilot project on the route from Dundas St. to St. Clair Ave.

to help ease traffic congestion.

But the transit agency says the project will be in place for only a short time and that the city will be looking at new and different ways to manage traffic.

The TTC says there are some issues to be worked out before the bridge is open, and that they need to get the infrastructure right before the opening.

“It’s going to be a long process, but we’re confident that we’re going to have a much more rapid and more resilient transit network once the floodwaters are gone,” said TTC CEO Andy Byford.

In addition to the bridge, a $2 billion tunnel is being dug to allow the city to build a new subway line to the waterfront.