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Beavers and the Murray: Part 1

[Warning: long, two-part post ahead]

On Tuesday, in an interesting demonstration of synchronicity, I wrote up some new news and finished reading an old book on Canada that improbably had a direct relationship with each other.

The news: the Murray-Darling Basin Authority’s dismal Drought Report. The book: Eric Collier’s Three Against the Wilderness, an account of life in the wilds of British Colombia during the 1930s.

It’s no longer politically correct to be "against" the wilderness, but in fact Collier was far from being against his adopted home. He restored it, and therein lies some thinking for contemporary Australia and its drought-stricken bread bowl.

Collier’s story, in short, is this:

As a young Englishman, bored with his country and the legal profession his father wanted him to enter, he took off for British Colombia. He married a part-Indian girl, and put his taste for adventure fully to the test by becoming a fur trapper. He bought trapping rights to 150,000 acres of remote forest, and with his wife and infant son set off to make a living from muskrats, coyote, weasels, foxes and mink.

In these comfortable times, you forget how tough people can be.

Collier and his wife Lillian put up an earth-floored, sod-roofed log cabin in 10 days, and lived in it for the next 27 years. He describes winters when temperatures got down to -50°C and beyond, and stayed there for days. Birds froze to their perches, moose calves froze where they lay.

But so long as the temperature was "warmer" than -30°C, Collier still toured his traps on snowshoes and skis.

One animal never appeared in his traps: the beaver.

When Collier arrived on his trap run, penniless, in 1931, there wasn't a beaver for hundreds of square kilometres around, and very few in all of BC. There hadn't been for at least 30 years. Indians, their old ways of life broken, had hunted beavers almost to extinction in order to trade their pelts for white man’s tobacco and booze.

As a result, old beaver dams had collapsed by the time Collier arrived. Areas once covered with hundreds of hectares of lake banked up behind the beaver dams were now putrid, stinking marshes. Snowmelt from the mountains rushed down the narrow streams out to sea, leaving only a thin trickle of water in the stream through summer.

Collier describes his first survey of his new kingdom. It was raked by forest fires no longer checked by the lakes and damp ground that the beaver dams had created. The fur-bearing life he was looking for wasn’t there.

He wrote: "…after having spent five long days in the saddle, skirting the edges of the marshes and following the deer paths through the forest, and in all that time glimpsing no other furbearer's track except those of the coyotes (their tracks were everywhere), I summed it all up by declaring, 'It's hopeless'."

And perhaps it would have been if Collier was just a whinging Pom and his wife wasn't made of seriously tough stuff.

They started by rebuilding some of the beaver dams by hand. They used crosscut saws, wheelbarrows and a horse team, and rebuilt a beaver dam wall 100 metres long, to a depth of 1.5 metres.

As the dam filled, aquatic plants filled once-rank marshes and migrating Canada geese splashed down in the new-old lake. The couple rebuilt another dam, and then another, 25 in all. The muskrats came back, and mink, and a whole suite of life that hadn't been there in numbers for decades. The forest fires coming down from the mountains stopped at the Colliers' dams.

Downstream, the farmers irrigating the fertile flats of the Fraser River suddenly found the boom-bust nature of their water supply resolved. They still got the boom with the spring snowmelt, but no bust after the melt had run through. Snowmelt held back by the Colliers’ dams and marshlands percolated down the river through the summer, maintaining flow.

When a game warden visited the Colliers in 1941, he recognised the potential for environmental restoration. A few months later, the first car to reach the Collier cabin limped in carrying two pairs of beavers.

Nine years later, Collier reported, he began trapping beavers for fur. Beavers had spread not only through the lakes within the Collier trapline, but right through the vast Chilcotin wilderness.

"(The beaver's) dams held and conserved the water upon thousands of major and minor watersheds, subirrigating the soils around them, and keeping them cool and moist during the hottest days of summer," Collier wrote.

What Collier described is the "landscape hydration" that is being discussed in Australia, thanks to Peter Andrews of Natural Sequence Farming fame, and quiet achievers Peter and Kate Marshall.

Australia isn't Canada. We don't have beavers or a massive snowmelt or, thankfully, the cold. But we have let our streams and rivers become gutters that carry water off the landscape and out to sea with maximum haste.

That needs to change. More in tomorrow's posting.

(Continued...)

* Three Against the Wilderness is long out of print. Fortunately there seems to be plenty of copies available through online secondhand booksellers. I got my copy out of Brisbane via Abebooks.

Update: it seems a reprint is available. See comment from "william" below.

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Date: Newest first | Oldest first
Great, thoughtful article. Collier's book is seminal. A colleague in New Zealand has a meeting this month with the local magistarate to talk about the role beavers can play in mitigating the effects of draught. I have written him to contact you, but if you write me I will put you in touch.
Posted by mtzbeavers, 9/04/2009 8:03:59 AM
I can't imagine beavers themselves can or should play any role in Australia's environment. It's the principle of slowing water's flow through the landscape that is interesting.
Posted by Matt Cawood on 9/04/2009 9:52:28 AM
Since my unkle Arthur in Kelowna told me about Eric's book I have been a huge fan of his and the work he did. This summer, with my sister, we managed to drive up to the headwaters of Meldrum Creek where we got as far as one of the dams that Eric and his wife had repaired. Despite lots of beaver felled trees around the pond, they were all decades old and we couldn't find any trace of current beaver activity. I wish I had time to explore the whole area to see if this was a specific case or if the beavers have dissapeared from all of the Meldrum stream catchment. http://mtkass.blogspot.com/2007/07/canadian-beaver-pest-or-b enefactor.html By the way, Eric's book has been reprinted and can be obtained from the Williams Lake Info Centre or from any good bookstore.
Posted by william, 9/04/2009 10:26:37 AM
Argentina introduced the Canadian beaver in the 50's and its proven to be an immeasurable threat to the local habitat in Patagonia. They're very adaptable animals that could possibly flourish in Australia but Australia's ecosystems might really take a beating.
Posted by dewar, 9/04/2009 12:18:18 PM
Brilliant connection to Peter Andrews' ideas Matt Cawood. It is worth noting that a beaver's "dam" operates as a regulator holding water levels higher during periods of flow, rather than as a storage dam. It is also worth noting that the NSW Department of Water and Energy is insisting on the opening of all regulators during any intermittent drought flows which means that no flow reaches many subsidiaries of river systems along the Wakool and Niemur River systems. It is also worth thinking about current plans to drain Lake Mokoan and the Menindee Lakes in the light of this blog. When irrigators and government departments collaborate they have a long history in Australia of draining so called "wasteful" swamps and wetlands. It may be that in our efforts to conserve water we are actually making the situation worse by drying out the continent. It could be that rainfall is actually linked to the amount of evapo-transpiration and that the drainage of swamps and clearing of land is causing micro climate change. Everybody wants to put water in pipelines and laser level channels so that they don't hold water, but it these "inefficient" irrigation infrastructures are actually providing some of the only "wetlands" we have left for native species. Enormous numbers of waterbirds breed on and near farm irrigation canals for example. Drought proofing Australia may mean doing exactly what Collier did: building hundreds of "regulators" to put water in the intermittent tributaries and billagongs. Thanks for this brilliant blog!
Posted by Bill Williams, 9/04/2009 9:00:55 PM
You can't imagine beavers playing any role in slowing water's flow in Australia? Well maybe when you look into the cost of building and maintaining miles and miles of little dams, you might imagine what it would be like to have a crew of aquatic engineers on sight 24/7 working for free.
Posted by mtzbeavers, 10/04/2009 12:28:44 AM
We already have a mechanical "beaver", its called the Bulldozer. And it can get a pile of regrowth logs and sticks into a gully is very short order. But some clowns declared that creeks were sacrosanct and that pushing slash into gullies actually caused erosion. They also demanded that regrowth be left standing in paddocks so the landholder cannot even afford the bulldozer any more.
Posted by Ian Mott, 10/04/2009 9:58:32 AM
Just to be clear, there's a distinction between dams and leaky weirs.

Leaky weirs don't stop water flow, just temporarily hold it back. Under the right conditions, that ponding allows water to seep into underground storage. If the landscape dries out, the stream level drops and that underground water is progressively returned to the stream.

Dams are absolute. They capture all water flow until they are full, and don't return anything to the environment. Most of the dam water held within the MDB is probably lost to evaporation or seepage. It's a very different principle to the idea of a leaky weir.

Posted by Matt Cawood on 13/04/2009 12:16:44 PM
Interesting isn't it. There is always some crank out there somewhere determined to distort observations to show that slash and burn is the best environmental management. Ecosystems are incredibly complex. Beware the simplistic solution.
Posted by Hello, 13/04/2009 12:19:31 PM
This is fascinating stuff. i'd love to do some on this place, but the daunting red tape scares me off. Can anyone shed some light on the Depts attitude to building leaky weirs in creeks? How does Peter Andrews get to do it on his place and they dont they come down like a ton of s#it?
Posted by cynic, 15/04/2009 2:21:28 PM
cynic, the authorities take a dim view of people fiddling around with streamlines, and with good reason. A lot of unskilled upstream activity isn't much good for those downstream. Building effective leaky weirs is a science. In the wrong place, they can end up just being another dam, or they can blow out in floods and make a hell of a mess. A chain of badly-built leaky weirs blowing out could be very bad news indeed.

That said, if the Andrews/Marshall/beaver concept has merit, then "the authorities", whoever they are, could look very hard at harnessing the idea in a way that works for all. Right now, it's hard to see what there is to lose.

Posted by Matt Cawood on 15/04/2009 5:53:29 PM
Ageed Matt, that the wrong engineering can make things go teribly wrong, I have seen that happen with landholders who put banks on floodplains to stop their flats being inundated. When everyone did their own thing, all they got was a more destructive flood that couldn't spread out and slow down over the floodplain. But still, these guys (Andrews/Marshall) were leaky weir 'virgins' once! They weren't born with the skill and experience, but got out there and had a go and because of that, 'conventional wisdom' has been shown to be wrong (yet again). Yes they could have got it wrong, but you gotta admire them for having a go. So are we talking about the need for some to have power, or the flexiblity to allow for freedom to innovate?
Posted by Cynic, 17/04/2009 3:27:56 PM
cynic, I'm all for intelligent landholder innovation. It's the most valuable environmental tool Australia has at its disposal. Government agencies have perpetrated some of the worst environmental vandalism inflicted on this country - look at some of the less successful SoilCon work, for starters - and there are many land holders who have achieved great things in land regeneration.

But in this case, there's a delicate balance between encouraging landholders to take a fresh look at their waterways, and having a big stick handy to discourage the insensitive and unskilled from doing things that damage rather than heal. I don't know where that balance lies, only that it needs to exist.


Posted by Matt Cawood on 18/04/2009 8:53:18 AM
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