Richmond/ Windsor Floodplain

1 LIVING IN THE richmond /. Windsor Floodplain . DO YOU KNOW YOUR FLOOD RISK? ARE YOU PREPARED FOR FLOODS? FIND OUT MORE AT FLOODS. THE RISK IS REAL. FLOODS CAN BE. MUCH WORSE. The Hawkesbury-Nepean Valley covers a wide area in Western Sydney from Bents Basin near Wallacia to the Brooklyn Bridge. The valley has a long history of dangerous and deep flooding. This is because There have been much larger floods in the valley floodwaters flow into the valley more quickly including the worst flood on record. In 1867, river than they can flow out, causing them to back up. levels reached metres above normal river height at Heavy rain caused by an East Coast Low can lead Windsor and the region was devastated. (See page 4. to severe flooding in just a few days. for flood comparisons.)

2 If a similar flood happened now the consequences would be catastrophic many lives The March 2021 flood was only the 15th largest recorded would be at risk and almost 90,000 people would have flood in the region though the impacts were felt far and to evacuate. wide. Floodwater severely impacted over 600 homes, over 30 caravan parks, hundreds of farms, and transport Floods are random, naturally occurring events. routes and essential services such as electricity were It's impossible to predict when the next major flood cut. The estimated damage bill was several hundred will happen. History has shown that serious floods can million dollars. happen many times in a single decade, and not again for many years. Floodwaters are also dangerous they can be deeper and faster flowing than they seem, and full of hazardous materials such as toxic chemicals, sewage, broken building materials, sharp branches and wildlife (including snakes).

3 Windsor hemmed in by floodwater, March 2021 flood. Source: Adam Hollingworth Submerged properties at Gronos Point, March 2021 flood. Source: Adam Hollingworth PAGE 1. | MARCH 2022. 1 24/2/22 3:09 pm Richmond/ Windsor Floodplain . THE MAP BELOW HIGHLIGHTS SUBURBS AT GREATEST RISK OF FLOODING FROM THE HAWKESBURY AND NEPEAN RIVERS. THE. FIRST STEP TO BEING PREPARED FOR A FLOOD IS KNOWING YOUR FLOOD RISK. THIS MAP SHOWS A FLOOD THAT HAS A 1 IN 500 OR A CHANCE PER YEAR OF HAPPENING. THIS FLOOD HAS A 15%. CHANCE OF HAPPENING IN AN 80-YEAR LIFETIME. IF YOUR SUBURB ISN'T LISTED, YOU COULD STILL BE AT RISK OF FLOODING. FREEMANS REACH. Flood depths taken from NORTH richmond richmond LOWLANDS. Hawkesbury-Nepean Valley Regional Flood Study (July 2019). CORNWALLIS.

4 HOBARTVILLE richmond . GROSE WOLD. Windsor . CLARENDON. AGNES BANKS. SOUTH Windsor . BLIGH PARK. YARRAMUNDI. LONDONDERRY. Flood depths taken from Nepean River Flood Study (November 2018). PAGE 2. 2 24/2/22 3:09 pm MAP KEY. DEPTH OF FLOODING. 0 - - - - 2m WILBERFORCE CATTAI. 2 - 4m >4m Boundary between different sources of flood mapping. PITT TOWN. PITT TOWN BOTTOMS MARAYLYA. MCGRATHS hill . OAKVILLE. MULGRAVE. VINEYARD. Flood information sources: Area upstream of Yarramundi Bridge - Nepean River Flood Study (Advisian 2018, prepared for Penrith City Council). Used with permission. Other flood information - Hawkesbury-Nepean Valley Regional Flood Study (WMAwater 2019, prepared for Infrastructure NSW). The map shows flooding from the Hawkesbury- Nepean River system including backwater effects.

5 PAGE 3. It does not focus on local catchment or overland flooding - please contact your local council for this information. 3 24/2/22 3:09 pm YOUR LOCAL AREA: IN THE FLOOD ZONE. In a minor ood, the low-lying areas between richmond and Pitt Town would be the most PROBABLE. affected. During moderate oods, the Yarramundi, MAXIMUM FLOOD. Windsor and North richmond bridges are all likely LEVEL (PMF). to be closed. Very little land would remain In a larger ood, similar to the one in 1961, many above oodwater hundreds of properties in McGraths hill , South in the Richmond/ Windsor Windsor , Windsor and Pitt Town would be oodplain in an inundated. The Winsdor Road evacuation route extremely rare would be cut, isolating McGraths hill . PMF. This predicted height is In a ood similar to the worst on record in 1867.

6 1867 FLOOD based on ood vast areas of the Floodplain would be affected, PEAK LEVEL. modelling. Highest ood since forming flood islands around Pitt Town and European Windsor . Thousands of properties across the 1 IN 100 CHANCE settlement, whole region would be ooded and there would be PER YEAR reaching above the rst- oor balcony large-scale evacuations. Essential services such as FLOOD LEVEL. of the Doctor's electricity, gas, water and sewerage would be cut, Thousands of House in Windsor . including to some properties outside the oodplain. dwellings would be Hundreds of impacted across houses were Many evacuation roads would also be cut off, the oodplain, and ooded. including t he Hawkesbury Valley Way. McGraths hill Populations were would be forced onto small completely ood islands at submerged.

7 The Windsor , Hawkesbury Valley richmond and Pitt Way evacuation Town. route would be cut. This predicted height is based on ood modelling. This level is 1961 FLOOD equivalent to metres above 2021 FLOOD PEAK LEVEL. mean sea level. PEAK LEVEL. Highest ood in Most recent major living memory. Hawkesbury River Hundreds of ood. Some houses ooded in houses on the Windsor . urban fringes were Yarramundi Bridge impacted. swept downstream. 2020 FLOOD The 2021 ood is described as PEAK LEVEL. a 1 in 10 20. First moderate chance per year ood since 1992. ood at Windsor . Yarramundi, North richmond and (old) Windsor bridges ooded, with signi cant disruption. These heights are relative to the normal river level at Windsor Bridge. Normal river level is assumed to be metres on the Windsor gauge.

8 The information contained in this publication is based on knowledge and understanding at the time of compilation (August 2021). However, because of advances in knowledge, users are reminded of the need to ensure that information upon which they rely is up to date. NSW State Emergency Service takes no responsibility for the accuracy, currency, reliability and correctness of any information in the map (including, without limitation, any of the information provided by third parties) nor for the accuracy, currency, reliability and correctness of links or references to information sources with regard to the map. While all reasonable care has been taken in the compilation, to the extent permitted by law, NSW State Emergency Service and the State of New South Wales and its employees and agents exclude all liability for the accuracy or completeness of the information, or for any injury, loss, or damage whatsoever (including without limitation liability for negligence and consequential losses) suffered by any person acting, or purporting to act in reliance upon anything contained herein.

9 PAGE 4. 4 24/2/22 3:09 pm GET PREPARED IN THE. Richmond/ Windsor Floodplain . THESE SIMPLE ACTIONS WILL HELP PREPARE YOUR HOUSEHOLD FOR FLOODS. BEING PREPARED CAN SAVE LIVES. How to prepare for flood What to do during a flood Know where to get updates and warnings Follow NSW SES Flood Advice and Emergency Warnings Bureau of Meteorology: local weather updates: Visit or download the Listen to your local ABC radio BOM app station for up to date flood NSW State Emergency Service (NSW SES): information and advice information on floods and storms Follow advice from NSW SES if you Visit and on social are asked to evacuate, don't wait until media including Facebook - it is too late Take your emergency bag ABC Radio: the official emergency broadcaster Listen at and ABC This should include your Listen app medications, prescriptions and any assistance equipment Prepare a Get Ready to Go kit Take your animals Put them on leads or in pet carriers What to pack: Know where to go 1.

10 Health care items like medications Follow advice on evacuations and prescriptions and check live traffic information. 2. Copies of your important documents Visit and (hard copies or stored digitally) or the Live Traffic app 3. Important valuables and momentos 4. Important phone numbers Look out for each other 5. Battery powered radio and torch Share information with family, friends, 6. Clothing and personal items and neighbours and help each other or those who may need assistance Make a plan for evacuation Know where you will go, how you will get there, what evacuation routes you can use, what you will do with your animals, and how you will manage your health Key contact information Visit for more information and tips. Find how to plan for your animals here 138 737 for general enquiries Share your plan 132 500 for emergency assistance Talk with your relatives, friends, and neighbours during a flood about what you will do if you need to evacuate 000 for life threatening emergencies PAGE 5.