Bushfire Relief

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GUEST OBSERVATION
Last season’s bushfires directly <a href="https://www.dailytelegraph.com.au/bushfiresupport/fathers-son-newlyweds-21-lives-lost-to-nsws-deadly-bushfires/news-story/0ba931abc7ce3f1bac820429873b75c2">killed 34 people</a> and devastated more than 8 million hectares of land along the south-eastern fringe of Australia.
A further <a href="https://www.theguardian.com/australia-news/2020/may/26/australias-summer-bushfire-smoke-killed-445-and-put-thousands-in-hospital-inquiry-hears">445 people</a> are estimated to have died from smoke-induced respiratory problems.
The burned landscape may take decades to recover, if it recovers at all.
While it’s become known colloquially as the <a href="https://www.propertyobserver.com.au/https://www.abc.net.au/news/2020-04-16/bushfire-royal-commission-begins-into-australia-black-summer/12152680">Black Summer</a>, last year’s fire season actually began in winter in parts of Queensland. The first fires were <a href="https://www.propertyobserver.com.au/https://www.abc.net.au/news/2019-06-27/bushfire-outlook-queensland-2019/11251150">in June</a>.
So will the 2020 fire season kick off this month? And is last summer’s inferno what we should expect as a normal fire season? The answer to both questions is no. Let’s look at why.
Last fire season
First, let’s recap what led to last year’s early start to the fire season, and why the bushfires became so intense and extensive.
The fires were so severe because they incorporated five energy sources. The most obvious is fuel: live and dead plant material.
The other sources bushfires get their energy from include the terrain, weather, atmospheric instability and a lack of moisture in the environment such as in soil, timber in houses and large woody debris.
The <a href="https://www.propertyobserver.com.au/https://www.abc.net.au/news/2019-06-27/bushfire-outlook-queensland-2019/11251150">June fires</a> in Queensland resulted from a drought due to the lack of rain coming from the Indian Ocean. The drought combined with unusually hot dry winds from the north-west. <a href="https://www.propertyobserver.com.au/https://www.abc.net.au/news/2019-08-28/queensland-bushfire-season-starts-earlier-lasts-longer/11456576">By August</a> the bushfires were burning all along the east coast of Australia and had become large and overwhelming.
Ahead of the fire season, environmental moisture was the lowest ever recorded in much of eastern Australia. This was due to the <a href="http://www.bom.gov.au/climate/iod/">Indian Ocean Dipole</a> – the difference in sea surface temperature on either side of the ocean – which affects rainfall in Australia. The dipole was in positive mode, which brought drought. This meant the fire used less of its own energy to spread.
Fire weather conditions in south-eastern Australia were severe from August 2019 until March 2020. Temperatures reached <a href="https://www.theguardian.com/australia-news/2019/dec/19/419c-australia-records-hottest-ever-day-one-day-after-previous-record">record highs</a> in places, relative humidity was low and winds were strong due to high-pressure systems tracking further north than normal.
High atmospheric instability, often associated with thunderstorms, enabled large fire plumes to develop as fires grew to several thousand hectares in size. This increased winds and dryness at ground level, rapidly escalating the damaging power and size of the fires.
Fuel levels were high because of the drying trend associated with climate change and a lack of low-intensity fires over the past couple of decades, which allowed fuel levels to build up.
What’s different now
Currently, at least two bushfire energy sources – fuels and drought – are at low levels.
Fuels are low because last season’s fires burnt through large tracts of landscape and it will take five to ten years for them to redevelop. The build-up will start with leaf litter, twigs and bark.
In forested areas, the initial flush of regrowth in understorey and overstorey will be live and moist. Gradually, leaves will turn over and dead litter will start to build up.
But there is little chance of areas severely burnt in 2019-20 carrying an intense fire for at least five years.
What’s also different this year to last is the moist conditions. Drought leading up to last fire season was severe (see below).
<a href="https://images.theconversation.com/files/340760/original/file-20200609-21201-quf46h.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/340760/original/file-20200609-21201-quf46h.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt=""></a>
Rainfall Deficiencies: 36 months (February 1 2017 to January 31 2020). <a class="source" href="http://www.bom.gov.au/jsp/awap/rain/index.jsp?colour=colour&amp;time=history%2Fnat%2F2017030120200229&amp;step=4&amp;map=drought&amp;period=36month&amp;area=nat">Australian Bureau of Meteorology</a>, <a class="license" href="http://creativecommons.org/licenses/by/4.0/">CC BY</a>
Environmental moisture was the driest on record, or in the lowest 5% of records for much of south-east Australia.
But the current level of drought (see below) is much less pronounced.
<a href="https://images.theconversation.com/files/340761/original/file-20200609-21208-1l3nwlm.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=1000&amp;fit=clip"><img src="https://images.theconversation.com/files/340761/original/file-20200609-21208-1l3nwlm.png?ixlib=rb-1.1.0&amp;q=45&amp;auto=format&amp;w=754&amp;fit=clip" alt=""></a>
Rainfall Deficiencies: 12 months (June 1 2019 to May 31 2020). <a class="source" href="http://www.bom.gov.au/jsp/awap/rain/index.jsp?colour=colour&amp;time=history%2Fnat%2F2019050120200430&amp;step=0&amp;map=drought&amp;period=12month&amp;area=nat">Australian Bureau of Meteorology</a>, <a class="license" href="http://creativecommons.org/licenses/by/4.0/">CC BY</a>
A change in weather patterns brought good rains to eastern Australia from late February to April.
A turning point?
It’s too early to say conclusively how the fire season will pan out in 2020-21. But moister conditions due to a neutral Indian Ocean Dipole and <a href="http://www.bom.gov.au/climate/enso/history/ln-2010-12/SOI-what.shtml">Southern Oscillation Index</a> (which indicates the strength of any <a href="https://theconversation.com/explainer-el-nino-and-la-nina-27719">El Niño and La Niña</a> events), the lack of fuel, and more normal weather patterns (known as a positive <a href="http://www.bom.gov.au/climate/sam/">Southern Annular Mode</a>) mean there is little prospect of an early start to the season.
The likelihood of severe bushfires in south-east Australia later in the year and over summer is much reduced. This doesn’t mean there won’t be bushfires. But they’re not likely to be as extensive and severe as last fire season.
The reduced bushfire risk is likely to persist for the next three to five years.
 
But, in the longer term, climate change means <a href="https://www.climatecouncil.org.au/not-normal-climate-change-bushfire-web/">severe fire seasons are becoming more frequent</a>. If we simply try to suppress these fires, we will fail. We need a concerted effort to manage the bushfire risk. This should involve carefully planned and implemented prescribed fires, as well as planning and preparing for bushfires.
Last bushfire season should be a turning point for land management in Australia. Five inquiries into the last bushfire season are under way, including a <a href="https://naturaldisaster.royalcommission.gov.au/about">royal commission</a>, a <a href="https://www.aph.gov.au/Parliamentary_Business/Committees/Senate/Finance_and_Public_Administration/Bushfirerecovery">Senate inquiry</a> and inquiries in <a href="https://www.safecom.sa.gov.au/site/independent_review_sa_201920_bushfires.jsp">South Australia</a>, <a href="https://www.igem.vic.gov.au/fire-season-inquiry">Victoria</a> and <a href="https://www.nsw.gov.au/nsw-government/projects-and-initiatives/nsw-bushfire-inquiry">New South Wales</a>.
These inquiries must lead to change. We have a short window of opportunity to start managing fires in the landscape more sustainably. If we don’t, in a decade’s time we may see the Black Summer repeat itself.<img src="https://counter.theconversation.com/content/139757/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important;">
<a href="https://theconversation.com/profiles/kevin-tolhurst-184">Kevin Tolhurst</a>, Hon. Assoc. Prof., Fire Ecology and Management, <a href="https://theconversation.com/institutions/university-of-melbourne-722">University of Melbourne</a>
This article is republished from <a href="https://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/its-12-months-since-the-last-bushfire-season-began-but-dont-expect-the-same-this-year-139757">original article</a>.
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j.ballantyne1990-6AQqhLzZaK

12 months since the last bushfire season, don't expect the same this year

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GUEST OBSERVATION
Recent disastrous <a href="https://theconversation.com/au/topics/bushfires-1377">bushfires</a> have rebooted debate about how to (re)build in the Australian bush. Questions are being asked about <a href="https://theconversation.com/australian-building-codes-dont-expect-houses-to-be-fire-proof-and-thats-by-design-129540">building standards</a>, <a href="https://theconversation.com/building-standards-give-us-false-hope-theres-no-such-thing-as-a-fireproof-house-130165">whether a fire-proof home is possible</a>, the <a href="https://www.smh.com.au/national/government-approved-bushfire-bunkers-could-help-protect-homes-lives-20200101-p53o0m">value of fire bunkers</a> when it’s too late to leave, and <a href="https://theconversation.com/before-we-rush-to-rebuild-after-fires-we-need-to-think-about-where-and-how-130049">if we should even live in the bush</a> any more.
I suggest homes and community buildings in bushfire-prone areas can be made much more fire-resistant, perhaps even fire-proof, by adopting earth-covered, off-grid structures – known as <a href="https://www.earthshipecohomes.com.au/about">Earthships</a> – as the new standard.
Built for survival
Houses sheltered by earth have a higher chance of survival in a bushfire. This is because <a href="https://inhabitat.com/this-earth-sheltered-australian-hobbit-home-stay-cozy-all-year/">earth-based constructions are non-flammable</a> (while topsoil can burn and smoulder, clayey, sandy and gravelly soil does not).
A typical Earthship design has double-glazed windows to the north to let in winter sun, while mounds of earth, pushed up to roof level, protect the south, east and west walls. Taking this a step further, an earth-covered house includes a layer of earth over the roof.
The north-facing double-glazed windows (an essential element of <a href="https://sustainability.williams.edu/green-building-basics/passive-solar-design">passive solar design</a>) is the only part of the building that needs some other protection.
<a href="https://hia.com.au/business-information/standards-regulations/building-in-bushfire-prone-areas">Bushfire building codes and standards</a> already demand that windows have extra-thick, toughened glass to resist burning debris and intense heat. Double glazing (two layers of glass separated by a small air gap) offers extra protection. In very high-risk areas, bushfire shutters are a requirement.
Although not demanded by building codes, automated sprinklers could be used to spray water on the windows. But automated systems are problematic during a bushfire when <a href="https://www.bnhcrc.com.au/news/2019/ten-years-black-saturday-what-have-we-discovered">power and water supplies are likely to fail</a>.
Independent water supplies (big water tanks) and pumps (usually petrol or diesel) are often a condition of approval for new homes in fire-prone areas. However, these are difficult to automate because of choke, throttle, ignition and refuelling issues.
Examples around Australia
Enter the Earthship. Invented by American architect <a href="https://en.wikipedia.org/wiki/Mike_Reynolds_(architect)">Michael Reynolds</a>, thousands have been built all over the world, often by owner-builders.
I built Australia’s first council-approved Earthship – Earthship Ironbank - in the bushfire-prone Adelaide hills. Australian examples can be found in all states, including at <a href="http://www.earthshipironbank.com.au/">Ironbank</a> in South Australia, <a href="https://www.propertyobserver.com.au/https://www.abc.net.au/news/2017-10-30/kinglake-black-saturday-survivor-builds-earthship/9091972">Kinglake</a> in Victoria, <a href="https://www.earthshipecohomes.com.au/east-augusta-wa">East Augusta</a> and <a href="https://www.earthshipecohomes.com.au/jurien-bay-wa">Jurien Bay</a> in Western Australia, and <a href="https://www.earthshipecohomes.com.au/suburban-earthship">Narara</a> and <a href="https://www.realestate.com.au/news/it-geek-building-dream-home-out-of-old-tyres-bottles-and-cans/">Marulan</a> in New South Wales.
Earthships have an electric pump powered by solar panels and a battery for day-to-day water supply – and to fight fires. Sprinklers can then spray water on any vulnerable areas regardless of grid failures and without needing to deal with the flammable fuel that petrol and diesel pumps require.
The standard Earthship design has another feature that could save lives. Underground pipes called earth-tubes or cooling tubes bring fresh air into the building at a nice temperature (better than outside) due to the heat-exchanging effect of the earth around the pipes. When wet fabric is placed over the end of the pipes, these can filter out bushfire smoke.
Earth-covered homes are very air-tight, which combined with the earth-tubes helps keep out smoke and reduce <a href="https://www.bushfirecrc.com/sites/default/files/managed/resource/katherine-haynes.pdf">asphyxiation risks</a>.
Another defence mechanism is the “greenhouse”, a sunroom and corridor space on the sunny north side used for passive heating and cooling, treating wastewater and growing food. Yet another layer of double glazing isolates the greenhouse from the living spaces behind it. Adding indoor sprinklers (commonplace in commercial buildings) to the greenhouse could create a “wet buffer zone” and stop embers blowing into living areas where flammable furnishings are a hazard.
An iconic Earthship feature is the tyres used to form the exterior earth walls. While empty tyres are highly flammable, in this design they are not. The tyres are filled with compacted earth and protected by a layer of earth many metres thick (inside walls are rendered). There is already <a href="https://pangeabuilders.com/earthship-buildings-are-fire-resistant-not-a-total-loss/">evidence of their fire-resistant nature</a>.
Safer for the planet too
My PhD research focused on the energy efficiency and environmental footprint of the Earthship, comparing it to other construction systems and designs.
Earth is a low-cost, readily available material. It takes very little energy to dig it up, needs no processing and minimal (if any) transport. It is difficult to think of a more sustainable, inexpensive and non-flammable material.
I found off-grid homes minimise their eco-footprint by kicking three very dirty habits: the power, water and sewage grids. “Earthy” construction methods, such as Earthship, rammed earth, mudbrick and strawbale, also have much lower environmental impacts.
Earth-covered buildings are <a href="https://www.intechopen.com/books/energy-conservation/earth-shelters-a-review-of-energy-conservation-properties-in-earth-sheltered-housing">renowned for their energy efficiency</a>. Earth insulates and has “thermal mass”, an architectural term for dense materials (e.g. concrete, brick, rammed earth, water). Thermal mass evens out temperature changes by absorbing heat when it is too hot inside and releasing heat when it is too cold inside. This means minimal heating and cooling bills.
There are a few “tricks” to getting council approval. Hire an experienced structural engineer and use a private certifier or surveyor for building rules consent as they are better equipped to certify compliance with the <a href="https://ncc.abcb.gov.au/ncc-online/About">National Construction Code</a>. The one aspect of the Earthship I couldn’t get approved was an <a href="http://www.earthshipironbank.com.au/">indoor greywater garden and toilet-flushing system</a>.
Parts of the roof are earth-covered with fire-fighting sprinklers on the roof and windows. If I was building again I’d prioritise bushfire resilience by making it fully earth-covered with fire shutters, sprinklers and a safe room.
Further study is needed to scientifically validate my proposal here. However, we already have some evidence that Earthships, with a few minor design changes, might be the most sustainable, liveable, economical, fire-resistant buildings ever conceived of.<img src="https://counter.theconversation.com/content/131291/count.gif?distributor=republish-lightbox-basic" alt="The Conversation" width="1" height="1" style="border: none !important; box-shadow: none !important; margin: 0 !important; max-height: 1px !important; max-width: 1px !important; min-height: 1px !important; min-width: 1px !important; opacity: 0 !important; outline: none !important; padding: 0 !important; text-shadow: none !important;">
<a href="https://theconversation.com/profiles/martin-freney-953199">Martin Freney</a>, Lecturer in Industrial and Sustainable Design, <a href="https://theconversation.com/institutions/university-of-south-australia-1180">University of South Australia</a>
This article is republished from <a href="http://theconversation.com">The Conversation</a> under a Creative Commons license. Read the <a href="https://theconversation.com/how-earthships-could-make-rebuilding-safer-in-bushfire-zones-131291">original article</a>.
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What are Earthships and how can they help with bushfire rebuilding?

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Firstly, small businesses in bushfire-affected communities will be able to operate from portable offices without council approval, under the latest bushfire recovery initiative from the NSW Government.
Deputy Premier and Minister responsible for Disaster Recovery John Barilaro said the changes will ensure regional business owners can continue to earn an income, employ local residents and support local economies.
Planning and Public Spaces Minister Rob Stokes implemented changes to the State Environmental Planning Policy (Exempt and Complying Development Codes) Amendment (Bushfire Response) 2020, which will enable any existing business that has sustained damage in the bushfires to operate from a portable office, such as a shipping container, for up to two years.
“This may only be a small change, but it’s one that will have a significant operational impact for the many small business owners across the State who have been devastated by these fires,” Mr Stokes said.
This initiative follows changes to allow temporary accommodation like caravans and storage containers to be on property for up to two years without council approval.
The NSW Government is also waiving Planning Reform Fees, worth an average of $320, and is issuing free BASIX certificates which usually cost $50, for bushfire-affected residents who need to rebuild their properties.
Minister for Finance and Small Business Damien Tudehope said small businesses were incredibly resilient and encouraged bushfire-affected enterprises to look into this new initiative.
“We’re committed to doing all we can to help small businesses affected by bushfire not only survive this difficult time, but thrive into the future,” Mr Tudehope stated.
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The latest planning and recovery initiatives for bushfire-affected communities

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The NSW Government will provide stamp duty relief for people who lost their homes during the bushfires and who choose to purchase a replacement home elsewhere rather than rebuild.
People purchasing replacement homes will only begin paying stamp duty once the amount payable exceeds $55,000. Stamp duty will therefore be paid on homes with a value $1.3 million or higher.
Deputy Premier and Minister responsible for Disaster Recovery John Barilaro, and Treasurer Dominic Perrottet, said the latest NSW Government assistance would enable people to get back on their feet and back into a new home faster.
“This is about ensuring people have the ability to buy a home to replace the one destroyed by fire and not have to worry about the substantial cost of stamp duty which can be tens of thousands of dollars,” Mr Barilaro said.
Mr Barilaro said 2448 homes were destroyed during the bushfires, with the Government-funded clean-up now well underway across the State.
Treasurer Dominic Perrottet said the stamp duty relief package would allow people much more flexibility and financial freedom as they made one of their most important decisions in the recovery process.
Information on how to apply for a refund and eligibility requirements will be available from Service NSW and Revenue NSW websites from March 10. Eligible people who have already paid duty will be able to apply for a refund.
HIA applauded the NSW Government for this decision.
“The Housing industry Association (HIA) welcomes the NSW governments announcement it will provide stamp duty relief for those people who have been directly impacted by the tragic bushfires that have swept across the state”, Executive Director NSW HIA David Bare said.
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