Case Study: Patoka Culvert

Working alongside mana whenua, we designed and installed a bespoke, cast-insitu, fish ladder within the culvert, ensuring native species can continue their upstream journey without disruption. Healthy fish passage is critical for the resilience of our waterways, and for protecting the taonga species that call them home.

By combining engineering innovation with cultural and environmental values, we’ve created a structure that is stronger, more resilient to future weather events and better for the ecosystem it supports.

Scope:

• Installation of 15m x 3.2m diameter PE culvert within existing carriageway, including associated inlet / outlet structures
• Construction of bespoke fish ladder
• Installation of fish baffles within culvert
• Rehabilitation of carriageway, including subbase, basecourse and surfacing
• Construction of MSE wall