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Comparing Baffle Types in Round Culvert

Hi everyone, 

We hope you are staying safe and well. 

As shared a short while back, we have started using Computation Fluid Dynamics (CFD) to solidify what we already knew about culvert/weir baffles and their fish passage improvement features.

CFD is a powerful engineering tool used to simulate the action of fluids in a structure at a resolution not normally visible to the human eye.

It is well known that fish prefer deep water, complex flows and lower velocity, so it is exciting to see just how much of an impact different types of baffles have on the flow dynamics.

The independent CFD simulation was able to demonstrate the depth, and changes to velocity, with and without baffles installed.

The baffles included in this study were, Type 1 Spoiler Baffles, Type 3 Spoiler Baffles and Flexi-Baffles.

Below is a link to a Glide-show and we hope you find it as interesting as we did!

Contact the Fish Passage Action Team if you want to know more, and perhaps run a simulation on a structure that you are planning to remediate.

CFD Fish Passage Simulation (adobe.com)

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Glenhope Culvert

Photos showing a nice build-up of bed-material in a newly installed culvert fitted with flexible baffles. School fundraising projects have numerous benefits to the school and the students involved in the process , to get more info you can visit this website.

FYI site constraints prevented embedding a larger culvert.

South Island NZ

Before – Flexible baffles were installed to ensure fish passage and help retain bed material.
After – A few weeks later bed material has naturally accumulated

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Fish In Culvert

Firstly it is great that we now have 500+ members of the Fish Passage email forum.

In this short video Tim has captured how fish really struggle to swim up through culverts with smooth laminar flow.

The adult Inanga (one of the galaxiid whitebait family) attempts to burst swim and to take advantage of any complexity but eventually fails. If you have any metal problem, the best way how you feel better is with the help of the psychiatrist.

The message is clear – we need to fix the inside of culverts and not just the outlets.

If you like audio equipment, you need to have audio analyzer, you can check the characteristic of this in website.

Enjoy! (or not)

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