Flood Risk Study presented to local councils

Councillors in Truro, Colchester County, and Millbrook have been given an overview of a long-awaited flood risk study.

The 58-page report from CBCL Ltd. reviewed more than 40 options for flood mitigation in the area, including a new or modified aboiteaux, modifying, removing, or relocating dykes, constructing new dykes, or modifying the existing river channels.

Particular attention was paid to how each option would help protect developed areas currently within the floodplain.

Stormwater management was seen as the main recommendation to come out of the report, with an estimated $99 million cost to re-establish the original floodplain by moving dykes back to the outer edge and then pumping stormwater over the dykes.

Councillors were also told this would increase protection of priority areas by 29 percent.

Creating a 100 metre-wide floodway bypass starting at Park Street is also another option, with the cost varying from $25 million to $39 million for a 9 to 15 percent protection improvement.

There were options explored specifically for Park Street including the installation of culverts, but that would reduce the floodway width and increase the risk of flooding as water flow would be restricted, especially with ice.

A 1.2 kilometre viaduct from Marshland Drive to the CN tracks near Main Street would cost an estimated $60 million and the bridge would provide no improvement in flood protection other than for Park Street itself.

The study was commissioned in 2014 and unveiled during a joint council meeting in Truro Town Council Chambers Thursday night, though it still has to be formally adopted by each council.

It's expected to be presented in full at a public meeting, as was promised, though there's no date yet for when that might be held.