Option D

A series of shorter secondary stopbanks upstream of Groyne 7

This option would see us build a short secondary stopbank from the confluence of the Ōkūkū River, which returns the breakout flow around Groyne 7.

Option D: A series of shorter secondary stopbanks upstream of Groyne 7

 

Pros

• This is the shortest option, which minimises impact on people living in the area in relation to impact on land and construction
• It focuses on the high-risk section where two rivers meet
• It could be a standalone option, or used in conjunction with the other options

Cons

• It doesn’t address the risk of the primary stopbank failing further downstream
• Its efficacy would rely on extensive primary stopbank upgrades (these may be implemented anyway)
  
  

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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