Rain Water Harvesting in Oatley

Jim Vickery , OFF member and retired Environmental Engineer, spoke on this topic at the 27th Oct meeting. Jim is determined to capture as much life- giving rain falling on his roof as possible by storing it in water tanks around his home. This reduces his reliance on town water supply and the erosive impact of excess storm water on our local streams. He provided guidelines and graphs showing the relationship between tank size and roof area based on rainfall records. In drier times, the Reliable Draw[water drawn every day without emptying tank ] is between Average Summer and Dry Winter levels shown in this chart. It is a useful guide relating storage volume and roof catchment area. A 2000L tank provides 50 100 L/day [if catchment is 100 sqm or more], sufficient to supply a
toilet in a small household and some water for the garden. A 6000L tank needs at least 200 sqm of catchment to supply water to a washing machine, toilet, and garden. Techniques for the collection, storage and delivery of rainwater were reviewed along
with uses for the water that overflows the tank. Jim runs his excess water into a swale in his backyard providing a bog that can recharge the water table. Running excess into a pond is another excellent method of harvesting rain water.
Rainwater tank installation guidelines:
  • Determine your daily need for rainwater.
  • Determine the size of your available roof catchment area.
  • A 2000 L tank will provide 50 to 100 L/day from a 100 sq m or larger roof.
  • A 6000 L tank or larger is necessary for supplying a washing machine or something similar. If the roof catchment area is greater than 200 sq m then the tank is less likely to empty out during dry periods .



Fractured Country: An Unconventional Invasion

This morning, mining affected communities and their supporters from the Sydney area walked into the headquarters of the NSW Department of Planning and Environment to submit a log of claims outlining the outrageous abuses of process and public trust in which the Department has engaged in its intimate support for the mining industry.

Our June OFF meeting was attended by more than 80 members and guests and featured a presentation by Nell Schofield from Lock the Gate Alliance,known for her lead role in the Aussie Cult classic Puberty Blues and later as a TV presenter.

Nell spoke about problems communities are facing under siege from coal and gas companies, The coalition’s primary goal is to ensure policy reform to protect land and water resources.

Fractured country videoPlease take the time to see their excellent documentary on this issue. Fractured Country: An Unconventional Invasion click video photo to watch video.




Environmental Dilemmas

Slide19John Davoren (OFF member and Editor of OFF news) on 23 September 2013 made a presentation to the society on our environment and the dilemmas facing an effective program for protecting it .

The areas listed as threatened and/or threatening included population growth, and degradation of energy resources, land, flora and fauna, air, water and food. The extent of human activity influencing the environment is hotly debated. Protection measures are severely criticised, as those not convinced of any human contribution see such expenditure as unproductive, and an unnecessary waste in fiscally trying times. The economic argument slows the implementation of protective processes, and the picture is further muddied when it is not agreed on what protection can and should be provided. Environmental conservation is important, and if we waste our natural resources,they will eventually be exhausted. What we need is sustainability, where we can live within our planet’s means socially, environmentally and economically.

SustainClick here to view slides of talk.Environmental Dilemmas

Note  file is 13.2Mb and take a few minutes to load.


Backyards for Wildlife

2012 OBackyards for Wildlife – A guide to creating habitat for native animals. Take the time to read this very  informative booklet produced by Bathhurst Regional Council, although the examples are of the Bathurst region there is much we can learn from this example.

Contents include -
♣ Why wildlife is important
♣ What is a Backyard for Wildlife?
♣ Tips for  creating habitat for your backyard for wildlife
♣ Fauna friendly fences
♣ Pets and wildlife
♣ Vegie gardens, organics, and backyard wildlife
♣ Urban yards & The rural yard
♣ Wildlife of the Bathurst region
♣ seful references for further information

Since Europeans first settled on the Bathurst plains in 1815, there have been drastic changes to our local environment. The grasslands and grassy woodlands were favoured for agriculture, and hence, the wildlife that existed there was the first to be displaced. …..

Despite these changes, Koalas, Platypuses, turtles, dragons, quolls, owls, falcons,treecreepers, pardalotes, pobblebonks, orb weavers and hundreds more local wildlife species still exist in the Bathurst Region:Through the enhancement of the human environment – our homes – we can greatly improve the environment for local fauna. By creating Backyards for Wildlife, each resident can take simple steps to reduce the pressures on Bathurst Region wildlife, and ensure that those animals that share our lives are assured a future.

Click here to download Pdf (3Mb) – Backyards For Wildlife


Beyond Climate Denial on a Neoliberal Planet

Manne,-RobertAbboud,-Antoinette-c-Conor-AshleighWalker,-Jeremy Sydney Writer Fest – In an election year, there seems less impetus for climate action than ever. Why has the Left, which has always regarded itself as having science on its side, been outflanked on climate policy? What does the bizarre success of denialism and the radical calls for planetary scale geo-engineering portend for the changing status of science in our society? Antoinette Abboud, Jeremy Walker and Robert Manne untangle the complex relationships between climate, politics and economic doctrines in a discussion with Overland editor Jeff Sparrow.

Click here to read more from Sydney Writers Fest

Excerpt from Overland magazine

We live in a winter of disconnect. As the permafrost melts and global warming accelerates, bringing us to the cusp of catastrophic environmental changes, governments and corporations continue their campaign of denial….

Many of us are caught up in the public theatre of climate policy, confounded that something so transparently illogical as outright science denial has been so effective. Why has the Left, which has always regarded itself as having science on its side, been so paralysed by climate policy?……

Geoengineering is a portmanteau term covering a range of intentional large-scale manipulations of the Earth’s climate…..

Like most neoliberal prescriptions, the most important aspect of this tortured marriage of science and corporate commodification is that it doesn’t work. Geoengineering presumes corporations can take unilateral actions violating international treaties and not have to own the consequences. It doesn’t resolve the root problem – increasing CO2 concentrations – and it will not stop ocean acidification, itself so dire that some scientists have called for a suite of novel ‘ocean engineering’ techniques to prevent the collapse of coral reefs.

Click here to To read  OVERLAND article on neoliberalism, climate and policy


Composting Fact Sheetcompost title

On a recent excursion to Mt Annan Botanic gardens some members picked up the FACT SHEET ON COMPOSTING  and were keen to share this little gem.






CLICK PHOTO to link to More about composting




Michael Mobbs’ Sustainable House

As a follow up to Michael Mobbs talk to the society last year an O.F.F field day was organised on Sat 2nd March to see a sustainable house in action. Some 20 people under overcast conditions caught the nominated train. As we alighted at Redfern the heavens opened and the wind picked up; but it soon eased, and we had an easy stroll to Chippendale. We passed some lovely old buildings with beautiful brickwork and decorative finishes, and two magnificent native trees, a great example for other councils.

Arriving at Michael’s house we ended up with a total of 38 participants signing in and paying the $5 entrance fee. Michael explained in detail how he had made his house sustainable. It is not connected to town water and sewerage
(treated in his back-yard); it uses solar electricity and hot water with only a small amount of town gas for cooking (the
most efficient method). He grows food in his tiny back-yard and keeps 2 chooks.
Michael was only too happy to answer our many questions.He sold copies of his books, Sustainable House and
Sustainable Food, the latter now available for loan at meetings. Later we had a quick look at the surrounding
streets with community plantings of edible and ornamental plants, compost bins and even a lending library in an old
esky. It was a most informative and enjoyable morning. Report by Graham Lalchere
For more information on Michael Mobbs sustainable house click photo 20130302_093926

Sustainable Food book available for loan at OFF meetings.