Tag Archives: water

Making a floating habitat island

12 Thursday Jul 2018

Posted by in ecology, propagation, regeneration, waterways

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The planted habitat island, ready to launch

Regular readers and supporters of our farm will be familiar with the challenges we’ve faced trying to re-establish native vegetation in the face of large populations of rampaging herbivores. Inspired by an idea from @nature_at_work_ (check them out on Instagram) and folks around the world working to increase urban and rural habitat, we thought we’d construct a floating habitat island.

Once installed in the dam, we hoped the island would function as a seed bank for aquatic plants, a fox-proof roost for waterbirds, and offer filtration through the plant roots as well as aquatic shelter and habitat.

During the summer, our friend Shani, assisted by a team of kids, got to work assembling a frame from some leftover PVC stormwater pipe to act as the float, with a length of shade cloth salvaged from our gully junk to act as a base onto which we could later plant local aquatic plants. The frame was tied to a rock anchor and then launched with great ceremony.

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The official launch of the habitat island (and anchor)

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Installation requires a great deal of precision and technical know-how.

In the following months, the island became popular with waterbirds of all types, with ducks often spotted perched on the floating edge, grebes diving underneath and the enclosed centre of the island becoming coated with feathers and bird manure. Continue reading →

New poster: Imagining Yarnauwi before colonisation

13 Thursday Jul 2017

Posted by in art & craft, ecology, history, regeneration, trees, waterways

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Click to view a printable, A3 version of the poster.

Over the last few years, we’ve spent a great deal of time learning about the landscape of Yarnauwi, and the broader southwestern Fleurieu Peninsula. This has been essential for us in helping us to understand how the landscape works, and therefore how we can best work to ensure its health and function. We’re inspired by a statement from the 2015 Greenhorns New Farmer’s Almanac, where Connor Stedman writes, “Farms, forests, and grasslands can store and regenerate natural capital again, rebuilding the ecological fabric that is the ultimate source of our prosperity and survival. But to know how to undertake that stewardship, it’s not enough to know the land as it is now. We need to dig below the recent surface and go deeper – find the older ecological and cultural stories of a place. It’s the wildlands that hold these stories, and it’s these lands that will return them to us if we know where to look and how to listen. An agrarian economy needs to tend, restore and engage in a deep relationship with the wild as well as the planted field.”

In this spirit, in this poster we’ve tried to imagine and illustrate the landscape of Yarnauwi and the surrounding area as it may’ve appeared before colonisation. It summarises our reading and research, as well as our experiences exploring more intact local landscapes. It’s a work of imagination, it’s definitely not to scale, but we hope it helps communicate some of the complexity of a functioning landscape and the interactions of the Kaurna in maintaining its function and ecological health over millennia. Then, as now, the southwestern Fleurieu was a cultural landscape, maintained through intentional management practices. This poster is also an effort to acknowledge our own place in the long history of this landscape. Continue reading →

A tour, a shed-warming and four years of change on the farm

03 Wednesday May 2017

Posted by in building, events, planning

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Guests take a tour of one of the revegetation areas, inspecting the growth of four years of planting. Photo by Jeff Catchlove.

On a balmy autumn afternoon, we celebrated the new shed with sixty of Yarnauwi Farm’s friends and supporters. Following a tour of the farm, we settled into a shared dinner and drinks by the campfire.

To mark the occasion we also produced a self-guided tour map of important developments and points of interest on the property, hard copies of which were gifted to our guests to be stuck on fridges and toilet doors.

Yarnauwi Farm Self-Guided Map. (Click for a printable A3 version).

The changes that have occurred at Yarnauwi over the last four-and-a-half-years have only been possible through the encouragement, support and labour of our community of friends, neighbours and family. We hope that this celebration went some way towards expressing how grateful we are.

Continue reading →

Yarnauwi Annual Report 2016

29 Thursday Dec 2016

Posted by in ecology, planning, regeneration

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In birthday cards I often wish the recipient a coming year of “the right kind of challenge”, optimistically suggesting it will herald positive growth and empowerment through problem-solving and negotiation. This year, I got a taste of my own medicine, with a winter of biblical proportions just the beginning of the challenges.

November marks four years since we began the Yarnauwi project. Four years of attempting to regenerate the property to our optimistic standards on the weekends, of packing and unpacking the car, of ferrying and entertaining one, then two, small children, of revegetating, managing erosion, managing pasture, managing water, managing livestock, managing weeds and managing the legacy of past land managers. These are all admirable, ambitious intentions, and what we’ve achieved has only been possible through the support and enthusiasm of our community of neighbours, friends and family. Continue reading →

The Wet Season 2016

06 Sunday Nov 2016

Posted by in ecology, livestock, trees, waterways

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The first big storm saw the dam fill and rivers broaden to ten times their normal size for an afternoon. A neighbour’s creek crossing dissolved in the flow, the rock and rubble broadcast along the river bottom. The second big storm saw our rainwater tank, still awaiting a shed to fill it, lifted vertically from its nest of stardroppers, vaulting a tractor and four or five fences before being swept off in the swollen waters of the Anacotilla River, carried across two properties and wedged under a red gum. The third storm came with days of warnings, threats of winds over 120km/h and rainfall to rival all of the previous deluges. It left all of South Australia without electricity, the farm a sucking, gurgling swamp, and me walking home through a darkened, scrambling city.

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Mist in the valleys

It’s been a demanding few months on the farm. The persistent moisture has made the ground unworkable, most of the farm inaccessible except on foot and the weather generally hostile to both our motivation and ability to do anything useful. The vast quantities of rain we’ve received however, have meant that moisture has permeated deep into the subsoil, so we console ourselves with the hope that as the weather warms, our tree plantings (including those from earlier this winter) will rocket skywards. Continue reading →

Winter and the One Rock Dams: erosion control after the rain

24 Sunday Jul 2016

Posted by in ecology, planning, regeneration, waterways

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Rain, and a full dam.

By late July this year we’ve already exceeded our entire rainfall for 2015, and for now, the rain shows no signs of abating. This is fantastic news for our revegetation efforts, and our dam is now almost full for the first time in two years. With heavy rains – we managed to top 100mm (4 inches) in a single day – it’s also a chance to test the effectiveness of the erosion control strategies we’ve employed.

With significant erosion in some key areas of the property, we’ve worked to adapt erosion control strategies such as those practised by Bill Zeedyk and Craig Sponholtz (see April’s Waterway Restoration workshop/working bee and our Resources page for more information). In particular, we’ve constructed Zuni bowls, for arresting headcuts, and One Rock Dams, to slow water flow, catch sediment and gradually lift the floor of erosion gullies. After the recent deluge, we toured the works to see how we went. The Zuni bowls have had mixed success: those in relative stable locations have been effective, those in dispersive soils have been unpredictable. The One Rock Dams (ORDs) have been generally successful, if swamped by sediment!

The impact of 100mm of rain in one day is significant: exposed areas lose significant amounts of soil (some areas of gully floor had almost 30cm of freshly deposited sediment), and areas of dispersive soil go berserk, collapsing in all directions. For some of these areas, we’re continually seeking further advice, but for those we can manage, we monitor and tweak over time, and try to “let the water do the work” in healing the landscape.

Continue reading →

Matching trees to tricky spots

25 Saturday Jun 2016

Posted by in ecology, planning, propagation, regeneration, trees

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Eucalyptus occidentalis, a hardy, salinity and waterlogging tolerant timber and bee forage WA species, putting on new growth despite a dry year.

For the first couple of years of tree planting, we adopted a pretty haphazard approach, planting a bit of everything everywhere, and waiting to see what would stick. It took only a couple of months to highlight which areas offered the conditions for revegetation at a respectable pace, and which did not. Some patches only appeared to support certain species, others seemed to support nothing at all. The challenge has been to work out why. For enthusiastic amateurs like us, the working out comes through plenty of observation, plenty of reading and plenty of research.

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One persistently hostile area of the farm offers saline, slaking, seasonally waterlogged clay with tunneling and cracks you could lose a child down.

For some areas on our farm, vegetation is a valuable indicator, plants like sea barley grass (Hordeum marinum) suggests mild salinity, and, in our case, seasonal waterlogging. In others, aspect and soil type present challenges. Three years of tree planting and walks through local bushland have also given us a sense of which local species might suit which locations. We keep trying new configurations in the same places, and also try to mimic the natural process of succession by planting hardy pioneers first, then waiting for them to establish shelter and canopy before adding others. As the balance of the landscape has changed through clearing, cultivation and the associated effects of erosion, shifting water tables and changes in nutrients and soil biology, many of the species that may have dominated a couple of centuries ago no longer tolerate certain areas of the block. Likewise, some areas that may have been conducive to vegetation when woodland was already present, once cleared, they seem to be hostile to its re-establishment: for example, a north-facing corridor of grey, cracking clay that has resisted our affections for two years now. Continue reading →

Winter active

31 Tuesday May 2016

Posted by in diy, ecology, regeneration, trees

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Blue gum (Eucalyptus leucoxylon) seedlings ready for planting.

Before Yarnauwi, we never really appreciated winter. Now, through the long dry season, we find ourselves yearning for a chill edge to the wind, the moisture in the grass, and skies of dark clouds. We’ve tried to plan our year to mimic the lives of so many of the organisms that occupy our landscape: in the hot, dry times, we go into maintenance mode, watching and waiting for the first rains before we spring into action again. With the greening of the landscape, it’s all on: tree-planting has begun, shed sites are levelled, the grass grows. In winter, the kangaroos converge in clans numbering hundreds, displaced from the pasture, they lounge among the seedlings in the reveg areas while we look on nervously.

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Joel and Annika work on a rock dam to arrest erosion on a boundary before the rains hit.

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And then the rains hit.

Continue reading →

Waterway restoration at Yarnauwi

20 Wednesday Apr 2016

Posted by in ecology, events, regeneration, waterways

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In April, we belatedly participated in Clean Up Australia Day, focussing our attentions on the final lode of rubbish in the gullies and constructing erosion control structures in areas of active erosion. Kitted out in dust-masks and gloves, our amazing team of volunteers completed in an hour what it would take us weeks to do alone, and by day’s end had removed six trailer-loads of steel, and about 20 sacks of rubbish, together with miscellaneous sun umbrellas, fitness treadmills and bmx frames. (See our Curated Junk page for similar treasures – undoubtedly there are more to come!)

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Continue reading →

Exploring the Fleurieu’s climate future

20 Saturday Feb 2016

Posted by in ecology, livestock, planning, regeneration, reviews, waterways

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We’ve recently read a couple of books that have served as a catalyst to revisit what a future climate scenario might be like for the Fleurieu Peninsula, and how we can ensure the greatest resilience for our patch of ground. The books are two practical volumes on climate change, the first The Handbook: Surviving and Living with Climate Change, by Jane Rawson and James Whitmore, is a tour of practical household and community strategies for adapting to climate change in Australia. The second, Two Percent Solutions for the Planet: 50 low-cost, low-tech, nature-based practices for combatting hunger, drought and climate change, is a farming and land restoration-focussed collection of case studies collected by Quivira Coalition co-founder, Courtney White. For readers that may’ve grown weary of the political inertia around climate change, not to mention the vast scale of the problem, the practical, household-, community- or farm-scale focus of both books offers a practical way of re-engaging with the climate challenge. Two Percent Solutions serves as an optimistic companion read to the sometimes gloomy vibe of The Handbook, with its strategies offering scope for both climate mitigation and adaptation. Continue reading →