Option A

A secondary stopbank extending from the terrace on Mount Thomas Road to the east of the racecourse

This option would see us building a second stopbank further south of the river, starting at the terrace on Mount Thomas Road and connecting back to the primary stopbank just east of the racecourse.Option A: A secondary stopbank extending from the terrace on Mount Thomas Road to the east of the racecourse

Pros

This provides two levels of protection for the urban areas of Rangiora and Kaiapoi, as well as the rural areas that are currently within the modelled flow paths for breakouts between the Ōkūkū to Rangiora

Cons

This is the longest alignment
The option crosses a significant number of properties
This option wouldn’t improve flood protection for properties in between the primary and secondary stopbanks, and would increase flood depths for some of these properties

Note the options included here are for the part of the river that extends from the Ōkūkū confluence to Rangiora Railway Bridge. We will share design options for downstream areas later in 2026. You can add comments directly to these options or give your feedback via the give feedback section of the page.

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