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Yarnauwi Farm

~ Fleurieu Peninsula, South Australia

Yarnauwi Farm

Tag Archives: one rock dam

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

24 Sunday Jul 2016

Posted by Joel in ecology, planning, regeneration, waterways

≈ 4 Comments

Tags

before and after, ecology, erosion, farm, Fleurieu Coast, one rock dam, planning, reuse, seasons, soil, southwestern Fleurieu, water, waterways, winter

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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.

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2022 marks a decade since we started working to regenerate Yarnauwi. To celebrate Joel's been working on a little comic to acknowledge all the amazing folks in our community near and far who have supported us and this place over the last 10 years. Here's a sample, but the whole thing is on our blog - follow the link in our bio!
Thanks to everyone who came joined us on our farm tour as part of @historyfestival and @heritagefleurieucoastfestival - we really appreciate your interest and enthusiasm!
We're honoured to have this story pop up on @abcnews_au sharing some of the work we've been doing to regenerate our patch. Our deepest thanks to all the friends, neighbours and family who have helped transform the property over the last decade!
It's been a good year in our little orchard, with plenty of ripe figs for us - and others! Here's one we found, positioned just like this on top of a fence post. I'm looking for a raven with fig juice running down its chin.
It might have an Instagram-unfriendly level of detail, but here's a comic Joel's been working on about our relationship with a particular weed, and some of the people who have inspired us to rethink how we manage it. You can have a look at the whole thing on our blog.
For the last few years we've been planting acorns in our front paddock. They're for Holm oaks (Quercus ilex), adapted to a similar dryland Mediterranean climate as ours. They're evergreen, and in decades to come will offer shade, fire suppression and both stock and human feed throughout their acorns. They're slow growing at best, but we've been able to get them growing with mulch, complete organic fertiliser and occasional watering. We've sliced pickle barrels into rings and partially buried them to form a well to hold water in the root zone when watering. The difference between those with and without the wells is pronounced. This little one is perhaps 3 years old, direct seeded.
After a couple of years, our stone terrace garden is complete and freshly planted with a pomegranate, mulberry and loquat. Thanks to @anacotillasprings for the stone! The scraps of mesh and sheep panels will keep the kangaroos off while we establish the garden.
The nopal with a fighting spirit! 💪 For years this single old prickly pear pad sat in a metal bucket only half full of soil, repeatedly gnawed at and knocked over by roos and presumed to be long dead. A bit of heat and dose of summer rain and what a resurrection! With its delicious fruit and young pads, we are so lucky to have such tough plants in the world!🌵#opuntia #pricklypear
We have reached a major milestone with the arrival of a Superb Fairy-Wren family! This is one of the species we have most been trying to attract by planting plenty of dense bushes for cover. In the end they used chest-high brassica weeds to hop up from the Anacotilla creek valley, and have set up a nest in one of our Old Man Saltbushes. One blue male and two brown females/juveniles can now be heard merrily cheeping as they flit along our wildlife corridors from saltbush to saltbush to kangaroo thorn to feral fig tree - just goes to show weeds have their place in habitat creation! 🌿 (this image taken at a different location). #maluruscyaneus #superbfairywren #fleurieucoast

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