Riverine flooding information for the Huon River and tributaries at Huonville and Ranelagh townships

Version 1.0 August 2024

To see the maps in more detail, lihat Peta Banjir Strategik Tasmania.

Huonville and Ranelagh are subject to flooding from:

• The Huon River
• Mountain River
• Skinners Creek

The maps show the expected 1% annual exceedance probability flood level in Huonville and Ranelagh. You are likely to experience a flood of this size at least once in your lifetime.

Huon River gauges at Tahune Bridge, Judbury, and Huonville measure real-time river levels and support flood forecasts and warnings for Huonville and Ranelagh. Other information comes from a network of real-time rainfall gauges. For flooding along the Huon River, the Bureau of Meteorology and the State Emergency Service will issue warnings that predict flood heights and timing at Huonville. These may be expressed as Minor, Moderate, and Major and/or give specific flood heights in meters.

Heavy rain in the South West wilderness can cause the Huon River to flood, and there is generally 6-12 hours warning time of flooding from the Huon River around Ranelagh and Huonville.  Rapid snowmelt sometimes enhances Huon River flooding.   High rainfall lower in the Huon River catchment and its tributaries can also add to flooding.

Mountain River and Skinners Creek are subject to flash flooding. This means there may be unexpected flooding without warning if heavy rain falls in and around Huonville.

Parts of Huonville and Ranelagh may also flood without warning due to storm water run-off when there is very heavy rain.

Adakah anda berisiko banjir?

The Huonville area has a long history of major flooding, including in 1901, 1947, 1958, 1960, 1975, 1996, 2016 and 2022. The area often has minor flooding.

Apa yang patut saya buat?

• Check the map opposite to see whether your home or business is likely to be at risk of flooding during a flood.
• Prepare a Home Emergency Plan, including whether you need to evacuate in advance of a flood, where you will go and what you need to take. See Bersedia untuk Kecemasan – Panduan untuk individu dan isi rumah bersiap sedia menghadapi kecemasan. 
• If you have a business in the area, you should have a plan that covers flooding.  Business Tasmania can help– see www.business.tas.gov.au/manage_a_business/ 
• If you need to evacuate or return home during a flood, make sure your route is safe.
• Asses your home or business and know what you need to do to prepare it to minimise possible damage from water inundation.

Floods like the one shown on the map, or worse, will occur again. No two floods are the same.

If you live in a low-lying area or near a watercourse, your house may flood. Even if your home is safe, you may need to detour around flooded areas or your road access may be cut. Never drive into or enter flood waters. Roads and bridges may be washed out or unsafe. Avoid travel during floods.

Mengetahui apa yang perlu dilakukan boleh menyelamatkan nyawa anda dan membantu melindungi harta benda anda. Mempunyai Pelan Kecemasan Rumah adalah salah satu cara terbaik untuk bersiap sedia. Tentukan pemicu cuaca dan hujan untuk masa bertindak.

Bureau of Meteorology Forecasts, Warnings, and Observations

The Huon River has several real-time river gauges and a network of rainfall gauges that can support flood warnings.  Floodwater at Judbury generally takes a couple of hours to reach Huonville. Monitor rainfall totals and river rises at www.bom.gov.au/tas/flood/ .

Whenever rain that may lead to flooding along the Huon River is expected, the Bureau will issue warnings when the river reaches specific heights.

Mountain River can rise quickly after rainfall and so there can be little to no warning of flooding.  There are no river gauges on Mountain River nor Skinners Creek.

Whenever heavy rain is expected in an area that may lead to flooding, the Bureau issues

• Severe Weather Warning and/or
• Thunderstorm Warning for heavy rainfall that may lead to flash flooding.

The time between the warning and heavy rain falling can vary from an hour to 24 hours or more. It is best to act on the warnings from the Bureau of Meteorology rather than wait for local flooding alerts around Mountain River and Skinners Creek.

Tracking Rainfall on Kunanyi/ Mount Wellington can help predict flooding around Mountain River. Go to www.bom.gov.au/tas/ .

The Mt Koonya Radar is useful to see when and where heavy rainfall is falling and is available on the BOM Weather app and website.

Download BOM Weather app and set your location to receive push notifications of warnings (more details at www.bom.gov.au/app/) .

Listen to ABC 936AM or go to tasalert.com for warnings.

Fahami amaran dan maklumat penting

Sentiasa peka dengan apa yang berlaku di sekeliling anda. Periksa ramalan, pemerhatian dan amaran dengan kerap.

• TasALERT.com
• stesen radio ABC tempatan anda atau
• yang Biro Meteorologi laman web.

	Nasihat (Kuning) Satu insiden telah berlaku. Tiada bahaya segera. Nantikan perkembangan sekiranya keadaan berubah.
	Tonton dan Bertindak (Oren): Terdapat peningkatan tahap ancaman. Keadaan sedang berubah dan anda perlu mula mengambil tindakan sekarang untuk melindungi diri anda dan keluarga anda
	Amaran Kecemasan (Merah): Amaran Kecemasan adalah tahap amaran tertinggi. Anda mungkin dalam bahaya dan perlu mengambil tindakan segera. Sebarang kelewatan kini meletakkan nyawa anda dalam risiko.
	Kemas kini komuniti (Biru): Maklumat dan kemas kini khusus untuk komuniti yang terjejas mengenai peristiwa atau insiden tertentu.
	Insiden (Putih) an incident is the initial occurrence of an event before it becomes an emergency warning. As soon as an incident is reported, TasALERT publishes basic information including the type and location of incident.

For more information see www.ses.tas.gov.au/warnings/ .

Flood levels around Huonville

While no two floods are the same, the following table shows what is likely to happen if there is flooding around Huonville. Even if your property is not flooded, you need to think about access.

The rainfall amounts that might cause such an event are examples. Other levels of rainfall can cause flooding depending on

• where the rain falls
• how heavy the rain is
• how long the rain lasts and
• how wet the ground is beforehand.

Minor flooding – over 4 metres @ Judbury / 3 metres @ Huonville

• Spill over riverbanks and cover nearby low lying areas.
• Causes minor flooding of agricultural and horticultural land along the river flats with some stock losses unless moved. Livestock should be moved from low lying areas near waterways.
• Can close the Channel Highway at Huonville
• Can inundate some minor roads, paths, tracks and low level bridges.
• May come up through drains in nearby streets.
• Affects low lying backyards and buildings below floor level.
• Covers riverside parklands, camping areas and may affect the caravan park.

Moderate flooding – over 5.3m @ Judbury / 3.6m @ Huonville

• Causes more extended and deeper flooding of agricultural and horticultural land along the river flats with some stock losses if not moved and damage to fences.
• Will close the Channel Highway at Huonville
• Spill over river banks and cover larger areas of land.
• Is likely to flood low-lying areas of Huonville with the possibility of water damage to some properties.
• May reach above floor levels in some houses and buildings, particularly along the Esplanade.
• Some properties should be evacuated.

Major flooding – over 6 metres @ Judbury / 4 metres @ Huonville

Huonville and surrounds have a 5-10% likelihood of experiencing such a flood in any year. A major flood will:

• Cause widespread and potentially damaging flooding of agricultural land, particularly in low lying areas.
• Water is likely to enter some commercial premises along Main Road to the south of the roundabout and surrounding areas unless preventative measures are taken eg sandbagging
• Affect utility services (power, water, sewage etc).
• It may be necessary to evacuate the occupants of some dwellings.
• The Huon Highway between Wilmot Road and Huonville Bridge may need to be closed, isolating multiple areas south of Huonville
• Is likely to have similar consequences to the flooding in June 2016, when flood peaks reached 6.5 metres at Judbury and 4.3 metres at Huonville.

Major flooding – approx. 5.1m @ Huonville

The type of flood that has a 2% chance of happening any year (current climate). Judbury water levels are likely to be around 8.9m. Flooding would likely extend north from the roundabout and affect surrounding areas, with flooding about 80cm higher than in 2016.

Major flooding – approx. 5.5m @ Huonville

The type of flooding that has a 1% chance of happening in any year (current climate). Everyone should be prepared for such an event. Judbury water levels are likely to be around 9.5m. Large areas of Huonville will become inundated, for example

• about 1.7m deep around Short St
• about 1.4m deep around the Huon Valley Council Chambers
• about 65cm deep around the roundabout
• about 15cm deep around the Huonville Library
• Areas not inundated may become isolated, including:
  • All areas South of the Huon River
  • Areas to the West of Main Road around Sale Street
  • Ranelagh and surrounds may be isolated for short periods if Mountain River is flooded.

Skinners Creek flooding

Recent works around Skinners Creek helps mitigate flood risks in surrounding areas. However, flooding may still happen in severe rain events, particularly if there is debris washed down from areas above. If Skinners Creek overtops, Sale Street and some surrounding properties may become flooded.

Huon Valley Council’s mitigation works mean that this extent of flooding is now unlikely with the same level of rainfall. However, people in this area should be aware that there may be some flooding in the area during severe rainfall events.

Mountain River flooding

If Mountain River floods, the areas most at risk of flooding include the caravan park plus nearby Glen Road and Wilmot Road. Ranelagh and surrounding areas may become isolated for a short time as Glen Road and access roads to the north may be inundated, however the new Lollara Road bridge is not likely to be overtopped unless it is an extreme event.

If Mountain River floods at the same time as the Huon River, this will lead to higher flooding in these areas and Huonville.

For flood information for areas upstream of Ranelagh, please see the Mountain River area flood guide.

Know your risk, get ready, reduce your risk where you can, connect with others, stay alert and act safe.

Sebelum banjir

Bersedia untuk Kecemasan – Panduan untuk individu dan isi rumah bersiap sedia menghadapi kecemasan. 

Ketahui risiko anda

Banjir sering berlaku di Tasmania dan boleh menyebabkan kerosakan yang meluas dan ketara. Dalam tempoh 200 tahun kebelakangan ini, terdapat 78 kematian berkaitan banjir di Tasmania. Panduan ini adalah untuk membantu anda memahami risiko banjir di kawasan anda.

2. Sediakan rumah anda

Miliki pelan kecemasan yang meliputi taufan dan banjir

Berfikir tentang apa yang akan anda lakukan semasa ribut atau banjir bermakna anda lebih bersedia dan semua orang lebih selamat. Miliki pelan kecemasan yang difahami oleh semua orang dalam isi rumah anda. Terdapat senarai semak untuk membantu anda memikirkan pelan anda – lihat Bersedia untuk Kecemasan – Panduan untuk individu dan isi rumah bersiap sedia menghadapi kecemasan.

Periksa pelan anda dengan kerap dan uji ia dengan setiap ahli isi rumah memikirkan senario banjir yang mungkin menjejaskan isi rumah anda.

Sediakan Kit Kecemasan

Uji bateri dalam radio dan lampu suluh secara berkala.

3. Reduce your risk from flooding where you can

• Pertimbangkan tentang ribut, banjir dan bahaya lain semasa membeli, menyelenggara atau membangunkan hartanah.
• Potong atau alih pokok dan dahan yang menjulur ke atas rumah, perniagaan anda atau berdekatan talian elektrik di kawasan anda.
• Pastikan saluran air dan perparitan anda bersih.

4. Connect with others

Kenali jiran anda dan libatkan diri dalam komuniti anda. Komuniti yang saling berhubung adalah komuniti yang lebih selamat dan lebih berdaya tahan semasa kecemasan dan dapat membantu semua orang pulih dengan lebih baik selepas itu. Periksa sama ada keluarga dan jiran selamat dan sedar tentang apa yang berlaku.

See for example the Huon Valley Good Neighbour project.

Semasa

5. Sentiasa terkini

Sentiasa peka dengan apa yang berlaku di sekeliling anda. Periksa ramalan, pemerhatian dan amaran dengan kerap. 

• TasALERT 
• stesen radio ABC tempatan anda atau
• yang Biro Meteorologi laman web.

6. Bertindak Selamat

• Mengawasi kanak-kanak.
• Bersiap sedia untuk kemungkinan gangguan bekalan elektrik, air atau internet.
• Pastikan peti kecemasan anda bersedia untuk digunakan.
• Jauhi kawasan yang dinaiki air seperti longkang. JANGAN SESEKALI berjalan, bermain, menunggang atau memandu dalam air banjir. Anda tidak selalu dapat melihat apa yang ada di bawah air atau betapa dalamnya atau derasnya air itu. Sangat mudah untuk dihanyutkan dan lemas dalam air yang bergerak pantas sedalam 20sm. Air banjir boleh berbahaya.

Bila rumah anda mungkin dinaiki air

• Letakkan barangan isi rumah di tempat yang tinggi untuk meminimumkan kerosakan yang mungkin berlaku.
• Padamkan bekalan elektrik dan gas jika selamat untuk berbuat demikian. 
• Cara yang baik untuk menghentikan aliran kumbahan masuk semula ke rumah anda ialah dengan meletakkan beg pasir di dalam beg plastik dan menggunakannya untuk menyumbat tandas serta menutup longkang dan singki.
• Pergi selagi anda boleh keluar dengan selamat.

Jika anda perlu berpindah

• Ikuti nasihat dari SES / Polis Tasmania.  
• Ambil kit kecemasan anda. 
• Pergi ke tempat rakan atau keluarga yang lebih selamat atau pusat pemindahan. 
• Beritahu orang lain ke mana anda telah pergi.

Jaga haiwan peliharaan anda

Anda bertanggungjawab terhadap haiwan anda semasa kecemasan. Sekiranya anda mempunyai haiwan peliharaan dan haiwan lain, anda akan mengambil masa lebih lama untuk berpindah sekiranya berlaku banjir atau kecemasan lain. Pindahkan ternakan dari kawasan yang terdedah kepada banjir **jauh sebelum** paras air banjir mungkin naik. Untuk maklumat lanjut, sila lihat

• Panduan RSPCA untuk persediaan haiwan dalam kecemasan
• Nasihat Majlis Lembah Huon tentang penyediaan rancangan kecemasan haiwan peliharaan
• yang Primary producer farm flood readiness toolkit.

Avoid travelling during storms and after storms

• Jangan melancong. Pelancong melambatkan perkhidmatan kecemasan dan menyebabkan kemalangan.
• Berhati-hatilah terhadap bahaya seperti
  • air di atas jalan
  • talian elektrik rosak
  • tanah runtuh
  • jalan rosak
  • pokok tumbang atau bumbung besi.
• Jangan memandu melalui air banjir. Kebanyakan kematian dan penyelamatan dalam banjir disebabkan oleh orang yang memandu melalui air banjir.
• Pandu perlahan dan pasang lampu hadapan anda di jalan yang tidak dinaiki banjir.

Selepas

• Terus ikuti perkembangan terkini dari ABC Local Radio, pembukaan semula jalan, mesyuarat komuniti, dll.
• Jika anda meninggalkan rumah anda, jangan pulang ke rumah sehingga SES atau Polis Tasmania memberitahu anda selamat untuk berbuat demikian.
• Berhati-hatilah terhadap bahaya jalan raya, seperti lumpur atau serpihan di jalan, jalan/jambatan yang rosak dan kru yang sedang bekerja membersihkan dan membaiki.

Jika rumah anda rosak

• Tinggal di aras tanah semasa memeriksa kerosakan. Berhati-hatilah dengan pokok tumbang, kaca pecah, bumbung yang longgar atau bahaya lain.
• Pakai but kuat, sarung tangan dan pakaian pelindung. 
• Gunakan lampu suluh, jangan gunakan mancis atau lilin di dalam bangunan yang dinaiki banjir. 
• Rebus semua air minuman sehingga anda diberitahu air paip selamat semula.
• Jangan hidupkan bekalan elektrik atau gas sehingga ia diuji oleh juruelektrik atau pemasang gas bertauliah bagi memastikan keselamatan.
• Jika rumah anda rosak dan anda perlu menginap di tempat lain, bawa bersama kit kecemasan dan haiwan peliharaan anda
• Ambil gambar kerosakan jika selamat untuk anda berbuat demikian dan hubungi syarikat insurans anda.
• Mengawasi kanak-kanak.
• Periksa jiran dalam keadaan baik.

Untuk maklumat lanjut, sila layari www.ses.tas.gov.au

Kekal dimaklumkan dan maklumat lanjut

Current warnings (TasAlerts) alerts.tas.gov.au

Biro Meteorologi (BoM)

Penyiar Kecemasan ABC 936AM

TASSES Social Media

facebook.com/sestasmania

Persediaan Menghadapi Kecemasan Banjir ses.tas.gov.au/plan-prepare/flood 

Huon Valley Council huonvalley.tas.gov.au 6264 0300

Perkhidmatan Geganti Kebangsaan (NRS) relayservice.gov.au

Penafian

The maps show potential flooding risks from consistent levels of rainfall across catchments, such as a 1% Annual Exceedance Probability (AEP).  In flooding events, rainfall is likely to be more inconsistent across a catchment, so these flood maps should be considered indicative only.  The mapped areas of flood risk show higher probability of inundation. Other areas have lower probability of flooding, but in severe and rare events (rarer than 1%AEP), other lower areas may be also at risk of inundation.

Maklumat dalam panduan ini adalah terkini pada tarikh penerbitannya. Walaupun segala usaha telah dibuat untuk memastikan kesahihan dan ketepatan data yang dibentangkan, Perkhidmatan Kecemasan Negeri tidak bertanggungjawab ke atas kesilapan atau ketinggalan data. Sila lihat piawaian Hak Cipta dan Pernyataan Penafian Kerajaan Tasmania untuk maklumat lanjut.