What we've seen here um, is that there is you know a whole bunch of restoration gone on here with riparian fencing and planting.

The local landowner has bought the fences right back to exclude stock, the planting is going really well, and now we're looking at taking it to the next step where we can um, start to improve fish passage, get more spawning for the Whitebait species which are here as inaka.

Yeah very much so.

I mean, anywhere where you've got you know, throughout all of New Zealand actually, anywhere where you've got farmland adjacent to you know estuaries and lowland rivers, historically the farmers have been worried about land inundation and one of the mains ways of managing that, is through tidal gates and flood gates.

Yeah i mean, i think the two aren't mutually exclusive, you can do both, and certainly what we're wanting to do here is we're installing water level monitoring gear, and all of the water quality gear that goes along with it as well.

And the idea there is that we can actually show farmers, these are the environmental outcomes that we can achieve, and this was the impact on the farms.

And so, it might be that there's no impact, and we can show that, and we can take that out to the rest of New Zealand and say you know, you can do this.

We've got this, you know this gear that we've got here, you can set alarms on it so in real time if the water level gets to a level that would worry a farmer, they get an alarm and we know we need to modify the gates we've got here, um you know to look after that property.

No not at all, and not, especially not with this newer technology that comes through.

So this water level recorder here, um you know, two or three years ago to install one like that that could communicate in real time would be about ten thousand dollars.

Uh that unit there is seven hundred.

This one has just got, um, a little cell phone card in it and um every hour it will beam out, um, and then we can look at a webpage.

We've got four of these along through the catchment here and we can look at a webpage to see what the water levels are doing.

When the challenge up until now has been the telemetry side of things in real time being able to understand what would happen.

Whereas before you would have to, um, say with those old oxygen loggers there as well, to get the data off that I have to manually go and download it.

So the telemetry technology that comes with this, um has been a real game changer.

Controlling floods and protecting fish

Traditional flood barriers can make it impossible for fish to migrate and breed. The team at Rūnanga o Ngāi Tahu is working to install a new kind of flood barrier that lets fish migrate freely.

Issue with flood barriers

Flood barriers are used all across New Zealand. They help farmers prevent their fields from flooding and minimise soil erosion. The problem is that they can also be a barrier to fish migration and breeding.

The construction of barriers like dams on a river can block or delay upstream fish migration — causing a fish population to decline. Over time the species may even become extinct.

What the team is doing to help fish migrate freely

That’s why Matt Dale has been working with his team at Te Rūnanga o Ngāi Tahu to install a new kind of flood barrier that lets fish migrate freely. The device, called a tidal gate, has an opening that allows water to flow freely when the tide moves in one direction, and automatically closes to prevent water from flowing in the other direction. Fish are able to swim upstream through the opening unless severe flooding causes it to close.

The team at Te Rūnanga o Ngāi Tahu has also installed water-level and water-quality monitoring devices so that they can be extra sure that these new barriers aren’t having any negative effects on the surrounding environment.

We are proud to support this kaupapa.

Learn more about Te Rūnanga o Ngāi Tahu.