Riverine and flash flooding flooding information for the Derwent River and Lachlan River at New Norfolk. See also the related flood guide for the Lachlan River above New Norfolk.

DRAFT – Please email any comments to ses@ses.tas.gov.au

若要更詳細地查看地圖，, 查看塔斯馬尼亞策略性洪水圖.

Parts of New Norfolk are subject to flooding from the Derwent and/or from the Lachlan Rivers.  The Derwent and Lachlan Rivers may flood at the same time or at different times. Low lying areas may also be impacted by storm water runoff following local high rainfall events.

The maps show the estimated flood levels for widespread rain that has a 2%, 1% and 0.5% chance of happening any year (% Annual Exceedance Probability). You are likely to experience these levels of flooding at least once in your lifetime. 

Derwent River flooding

Widespread heavy rainfall in the Derwent catchment as far away as Lake St Clair and yingina/ Great Lake can flood low-lying riverside areas of New Norfolk. The bridge across the river may be cut.  Such floods can isolate the New Norfolk and surrounding areas.

Tides, melting snow, the level of soil moisture and the dam levels can impact flood levels.  During storms, sea levels can rise and this can increase flooding at high tide. However, dam level management is not likely to have a significant impact on flood levels during a major flood.

Lachlan River flooding

Flooding from the Lachlan River is fed by high rainfall on kunanyi / Mount Wellington. It is difficult to predict and there is often little to no warning.  Tynwald Park and the nearby highway can become inundated.  See the related flood guide for the Lachlan River for more details.

您有洪水風險嗎？

New Norfolk has a long history of flooding.  The most significant flood since European settlement in 1960 flooded many homes and other buildings near the river and isolated the area. Flooding also happened in 1916, 1922, 1923, 1924, 1946, 1947, 1948, 1951, 1952, 1953, 1958, 1962, 1970, 1971, 1974, 1975, 1980, 1988, 1991, 1994, 2007, 2009, 2011, 2016 and 2018.

It is important to be prepared for major flooding events that may not have happened within most people’s living memory.

我應該做什麼？

• 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 為緊急情況做好準備 – 為個人和家庭準備應急措施的指南。. 
• 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.

如果您居住在低窪地區或靠近水道，您的房屋可能會被淹沒。即使您的住所安全，您也可能需要繞過淹水地區，或者您的道路通行可能會被阻斷。切勿駕車進入或身處洪水之中。道路和橋樑可能會被沖毀或不安全。洪水期間請避免出行。.

知道該怎麼做可以拯救你的生命並保護你的財產。制定家庭緊急計畫是最好的準備方法之一。決定天氣和降雨的觸發條件，以便採取行動。.

中央氣象局預報、警報與觀測

The Bureau of Meteorology monitors rainfall and river levels in the upper reaches of the Derwent River.  They issue flood warnings when river levels are likely to reach the following heights. SES works closely with the Bureau to provide timely warnings where possible.

River gauges	Alert	Minor	Moderate	Major
Ouse River at Ashton	2.4m	2.4m	3.2	4.5
Ouse River at 3B Weir		3.0	3.7	4.3
Clyde River at Bothwell	0.9m	2.0m	3.0	4.0
Styx River at Bruces Bridge		2.0m	n/a	n/a
Derwent River below Meadowbank Dam	4.1m	4.1m	6.1m	7.3m
Derwent River at Macquarie Plains	4.0m	4.0m	5.0m	6.7m
Plenty River at Feilton		2.8m	n/a	n/a
Derwent River at New Norfolk		2.0m (2.3m estimated 50% AEP)	4.0m (4.3m estimated 10%AEP)	6.0 (6.3m  estimated 1% AEP)

Notes

• % AEP (Annual Exceedance Probability) is estimated and only a rough guide. Rainfall levels and so flood levels can differ greatly across the catchment in a flooding event. More precise estimates of gauge and flood warning levels is a work in progress.
• A major level in the upper catchment may not translate to a major level at New Norfolk if there is not high rainfall in other parts of the catchment.
• While previously the 1960 flood was considered about a 0.75%AEP event (1 in 150 year event), more recent information suggests the event was more rare, that is, with less than a 0.5% chance of happening any year.

For information on flood warnings in the Lachlan River see the related Lachlan River Flood Guide.  In summary, there are no water level gauges on this river – the short catchment does not give enough time to issue a warning before flooding arrives.  Keep an eye on rainfall on kunanyi/ the Wellington Range.

Whenever 大雨 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.

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.

了解警告和關鍵資訊

隨時留意周遭狀況。定期查看天氣預報、觀測數據和警報。.

• TasALERT.com
• 您當地的 ABC 電台 或
• 這 氣象局 網站.

	建議 (黃色)： 已發生事件。目前沒有立即危險。請隨時更新最新情況，以防局勢變動。.
	觀察與行動（橘色）： 威脅等級升高。情勢正在改變，您現在就必須採取行動保護您和您的家人。
	緊急警告（紅色）： 緊急警報為最高級別的警報。您可能身處危險之中，需要立即採取行動。任何延誤都可能危及您的生命。.
	社群更新（藍色）： 針對特定事件或事故，向受影響社群提供的具體資訊和最新消息。.
	事件（白色）： an incident is the initial occurrence of an event before it becomes an emergency warning. As soon as an incident is reported, TasALERT published basic information including the type and location of incident.

Flood levels around the Derwent River

While no two floods are the same, the following describes what is likely to happen if there is flooding around the area. 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.

Melting snow can also contribute to flooding.

Minor flooding (Derwent River level at New Norfolk is at least 2m)

This level of flooding has an estimated 20-50% chance of happening any year.

• Water spills over riverbanks and covers nearby low-lying areas. 
• There are some areas of Tynwald Park and New Norfolk’s riverside parklands inundated.
• Agricultural and horticultural land on river flats around Sorell Creek may be at risk.  Livestock should be moved from these areas.

Moderate flooding (Derwent River level at New Norfolk is at least 4m)

This level of flooding has an estimated 5-10% chance of happening any year.

• There is extensive flooding of Tynwald Park, riverside parkland areas and some low-lying nearby properties, mostly below floor height.
• The caravan park and other riverside facilities are likely to be impacted..
• Low lying areas of railway line may be impacted.

Major flooding (Derwent River level at New Norfolk reaches at least 6m).

Widespread heavy rainfall across the catchment that has a 1- 2% chance or less of happening can cause major flooding.  This level of widespread rainfall around Bushy Park might be more than for example:

• 51mm at Bushy Park and 61mm at Derwent Bridge over 6 hours
• 57mm at Bushy Park and 89mm at Derwent Bridge over 12 hours
• 73mm at Bushy Park and 129mm at Derwent Bridge over 24 hours
• 90mm at Bushy Park and 183mm at Derwent Bridge over 48 hours

Note the level of flooding can depend on many factors, such as where the rain falls and how widespread it is, and how wet the catchment is beforehand.  Areas that are likely to be flooded from Derwent River flooding in a major flood event include:

• The Lyell Highway/ Molesworth Road intersection
• New Norfolk Esplanade
• Upper Boyer Road / Rocks Road from Boyer Road to Station St
• Lyell Highway Derwent crossing at New Norfolk and lower Hamilton Road
• Glenora Road #95-#119
• 130 Hamilton Road
• Lyell Highway Back River crossing
• Glenora Road Glen Fern Creek
• Glenora Road W of New Norfolk
• Derwent Valley Railway, various areas

Areas that are likely to be flooded from Lachlan River around New Norfolk include:.

• Tynwald Park and nearby Lyell Highway
• Lower Road on the Lachlan River
• Humphrey St/ lower Lachlan Rd

Please see the related flood guide for the Lachlan River for more details.

In a major flood event, the New Norfolk area may become isolated from Hobart and upstream areas due to water across the Lyell Highway, Boyer Road and Plenty Road. The areas on the north and south side of the river are likely to become isolated as the bridge becomes flooded or dangerous.  Other potential areas of isolation are:

• South-eastern New Norfolk/ Brookside
• New Norfolk Central Business District (south of the Derwent)
• New Norfolk north side river, Lawitta, Magra
• Pulpit Rock Road
• Glenora Road
• Glenfern Road and surrounds
• Lachlan and surrounds

If flooding levels reach the same heights as the 1960 floods in New Norfolk (6.8m at New Norfolk), flooding in the areas already listed will be deeper, and water could spread to the following areas.

North side of the Derwent River     

• Extension of flooding along Rocks Road to above the rail line
• Properties on Golding Avenue, Oast Street, Station Street, Craw Street
• Lower Back River Road
• The rail line west of bridge and all properties below

South side east side of the New Norfolk Bridge over the Derwent 

• Bridge Street, ‘The Woodbridge’ accommodation riverside building
• All properties on Page Avenue and Ferry Street, Montegu Street, Alfred Street
• The sewage works

South side Derwent River west of the bridge     

• Glenora Road to past Water treatment plant and further low-lying properties near the river
• The bottom end of Glenfern Road

Image: New Norfolk in flood 1960 by Pauline Plunkett

Go to tasalerts.com or listen to ABC local radio for detailed up to date information and advice during heavy rainfall events.

了解你的風險，做好準備，盡可能降低風險，與他人聯繫，保持警惕並安全行動。.

洪水之前

1. 認識你的風險

塔斯馬尼亞經常發生洪水，可能造成廣泛且嚴重的損害。在過去 200 年裡，塔斯馬尼亞有 78 人死於與洪水相關的事件。本指南旨在幫助您了解您所在地區的洪水風險。.

2. 準備您的家戶

制定包含風暴和洪水應變計畫

思考一下在風暴或洪水來襲時你會怎麼做，意味著你準備得更充分，每個人都會更安全。制定一個家庭中的每個人都理解的緊急計畫。有檢查表可以幫助你思考你的計畫——請參閱 為緊急情況做好準備 – 為個人和家庭準備應急措施的指南。. 
定期檢查您的計劃，並讓家中的每個人都設想一次可能影響您家的洪水情況來進行測試。.

準備一個緊急救生包

定期測試收音機和手電筒的電池。.

3. 在可能的情況下，降低您遭受洪水侵襲的風險

• 在購買、維護或開發房地產時，請考慮風暴、洪水和其他災害。.
• 修剪或移除您家中、商家或您家附近有電力線的樹木和樹枝。.
• 保持您的排水溝和排水管暢通。.

4. 與他人建立聯繫

認識你的鄰居並參與你的社區。一個緊密的社區，在緊急情況下更安全、更有韌性，並有助於每個人在事後更好地恢復。檢查家人和鄰居是否安全，並了解正在發生的事情。.

See for example the Huon Valley Good Neighbour project.

期間

5. Keep up to date

隨時留意周遭狀況。定期查看天氣預報、觀測數據和警報。. 

• 塔斯警報 
• 您當地的 ABC 電台 或
• 這 氣象局 網站.

6. Act Safe

• 監督兒童.
• 為可能的停電、停水或斷網做好準備。.
• 檢查您的緊急救助包是否已準備就緒。.
• 切勿靠近淹水區域，例如排水溝。. 永不 在洪水中有行走、玩耍、骑行或开车。你無法確定水下有什麼，或水有多深、流速有多快。20公分的湍急的洪水就很容易將人沖走並淹死。洪水可能很危險。.

您的房屋可能發生淹水時

• 將家居物品放在高處，以盡量減少潛在損壞。.
• 如果安全的話，請關閉水電和瓦斯。. 
• 一種防止污水倒灌回屋內的好方法是將沙包放入塑膠袋中，然後用它們來堵塞馬桶、蓋住排水孔和水槽。.
• 趁你還能安全脫困時趕快離開。.

如果你需要疏散

• 請遵循 SES / 塔斯馬尼亞警方的建議。.  
• 帶上你的緊急求生包。. 
• 前往朋友或家人較安全的地方，或前往疏散中心。. 
• 讓別人知道你去了哪裡。.

照顧好你的動物

在緊急情況下，您有責任照顧您的動物。如果您有寵物和其他動物，在洪水或其他緊急情況下，疏散的時間會更長。在洪水可能上漲之前，請及時將牲畜移離易受洪水影響的地區。更多資訊請參閱

• RSPCA 應對緊急情況動物的指南
• Huon Valley Council’s advice on preparing an emergency pet plan
• 這 主要生產者農場洪水準備工具箱.

請避免在風暴期間和風暴之後旅行

• 不要去觀光。觀光客會延誤緊急服務並造成事故。.
• 注意危險，例如
  • 路面积水
  • 損壞的電力線
  • 山崩
  • 損壞的道路
  • 倒下的樹木或屋頂鐵片。.
• 切勿駕車通過淹水區域。洪水中的大多數死亡和救援事件都與駕車通過淹水區域有關。.
• 緩慢行駛，並在不受洪水影響的道路上打開頭燈。.

之後

• 請持續收聽 ABC 地方電台的最新消息、道路重新開放、社區會議等資訊。.
• 如果您離開家，請勿在聯邦緊急事務局 (SES) 或塔斯馬尼亞警方告知您安全之前回家。.
• 注意道路上的危險，例如路面上的泥沙或碎屑、道路/橋樑損壞以及正在進行清理和修復工作的工人。.

如果您的房屋已受損

• 在檢查損壞時，請待在地面。小心掉落的樹木、碎玻璃、鬆動的屋頂或其它危險物品。.
• 穿著堅固的靴子、手套和防護服。. 
• 請使用手電筒，切勿在受洪水影響的建築物內使用火柴或蠟燭。. 
• 將所有飲用水煮沸，直到被告知自來水再次安全為止。.
• 在經註冊電工或燃氣技師測試安全之前，請勿開啟電力或燃氣。.
• 如果您的房屋受損，需要暫時住在其他地方，請攜帶您的緊急應變包和寵物一同前往。
• 如安全，請拍攝任何損壞的照片，並聯繫您的保險公司。.
• 監督兒童.
• 檢查鄰居是否安好。.

如需更多資訊，請前往 www.ses.tas.gov.au

保持獲取最新資訊及更多詳盡資料

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

氣象局 (BoM)

Emergency Broadcasters ABC 936AM

TASSES Social Media

• facebook.com/sestasmania

Preparing for Flood Emergencies ses.tas.gov.au/plan-prepare/flood 

Derwent Valley Council  derwentvalley.tas.gov.au   6261 8500

國家轉接服務 (NRS) relayservice.gov.au

免責聲明

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.

本指南中的資訊在出版時是最新資料。儘管已盡一切努力確保所呈現數據的有效性和準確性，但州緊急服務部門不對數據錯誤或遺漏負責。請參閱標準 塔斯馬尼亞州政府的版權與免責聲明 更多詳情.