INTERNATIONAL FISH PASSAGE LEARNINGS AND RETROFIT LESSONS FROM CHRISTCHURCH

Mullaney M (Christchurch City Council (CCC)), Groves M (WSP), Margetts B (CCC)

ABSTRACT

The use of riffles as a means to remove vertical barriers on waterways is not a new practice, but it has been evolving and improving over time and is more relevant today than ever with the strengthening emphasis on fish passage in New Zealand.

This presentation will cover the design process for the Mona Vale riffle in Christchurch which is being constructed to remove an existing fish passage barrier. The project included input and review from overseas experts in riffle design from Charles Sturt University and incorporates learnings from computational fluid dynamics (CFD) modelling.

The remediation of this weir is planned to be used as a case study for weir fish passage barriers nationwide, through resources provided by the New Zealand Fish Passage Advisory Group.

The full abstract can be downloaded below