Study Area The study area is located in south west Sydney and includes parts of the suburbs of East Hills, Panania and Picnic Point. It is an urban catchment that drains through a stormwater pipe network and Monash Creek to the Georges River. Much of the study area is also at risk of flooding from the Georges River, and an upstream deflector levee and blockwall finger levees have been constructed to mitigate this risk in the Carinya Road area. The Lucas Road catchment is wholly within the Bankstown City local government area (LGA). Outcomes from the Study The main outcomes from this study include:,

Study Area The study area is located within the Sydney suburb of East Hills. The study area is a small urban catchment centred on the East Hills Railway station, which drains through a stormwater pipe network to the Georges River. Much of the study area is also affected by flooding from the Georges River, where a series of blockwall “finger levees” have been constructed to reduce flood velocities and the hazard experienced to the occupants of riverfront dwellings. The catchment is wholly within the Bankstown local government area. Report Structure This report is divided into two parts. The first part provides background on the study and further discussion of the available data, modelling approach and results from the flood model that was established to analyse flooding within the catchment. The second part is a technical report that provides additional detail concerning the flood model, model results and flood mapping, which is included as an appendix. Outcomes from the Study Outcomes from this study include: (i) a database of all drainage assets within the study area; (ii) establishment of a computer model capable of assessing flood behaviour; (iii) information on flood behaviour under existing catchment conditions; and (iv) a model that can be used to assess flood mitigation options and future development proposals. Database of Drainage Assets All data collected for the study has been included within a GIS database. This allows the data to be spatially represented across the study area and allows for easy retrieval of the data as required. Information in the database includes data for some 88 stormwater pits and 83 stormwater drainage pipelines. Other catchment data, including aerial photography, property cadastre, building footprints and the terrain surface (based on ALS survey) is also represented in the database. Computer Modelling A numerical computer model was developed for the catchment to simulate flood behaviour, using the computer program known as TUFLOW. Surface flows are represented in the model through a 2-dimensional grid covering the entire study area. The stormwater pipe network is included as 1-dimensional elements within this grid. Full details of the modelling approach, modelling parameters and other assumptions are included in the Flood Model Report, which is included in Appendix A. Existing Flood Behaviour Design flood behaviour has been computed for a range of floods, ranging from relatively frequent events to more extreme floods, under existing (2007) catchment conditions. The model produces a grid of results over the study area providing data on flood levels, flood depths and flood velocities. Flood level contours have also been prepared showing contours of equal flood heights throughout the study area. This data is provided digitally and can be overlaid on base mapping such as aerial photos and cadastral plans showing property boundaries. All flood model results have been provided to Council for incorporation into their GIS computer system. Much of this information is also included as A4 sized plans included in Appendix A. It is intended to develop a database of properties that are at risk of being affected by flooding as part of the floodplain management study, which is the next phase of the investigations. This will define the problem areas within the catchment and allow an assessment of potential flood mitigation options.

Study Area The study area is located in south west Sydney and includes parts of the suburbs of Revesby Heights, Revesby, Panania and Picnic Point. It is an urban catchment that drains in a south-easterly direction through a stormwater pipe network to the Georges River. The Morris Gully catchment is wholly within the southern section of Bankstown City Council (LGA). Outcomes from the Study The main outcomes from this study include:,

This report presents the Flood Study undertaken to define flooding characteristics of the Lansdowne catchment in the Bankstown City Council area in NSW.

THE STUDY AREA The Upper Parramatta River catchment covers an area of 110 square kilometres and covers all land that drains to the Parramatta River upstream of its tidal limit at the Charles Street Weir, between the Barry Wilde Bridge (Wilde Avenue) and the Gasworks Bridge (Macarthur Street). Most of the catchment is urbanised and has a population of more than 230,000. However, there are significant areas of urban bushland, generally located along the major watercourses. A map of the study area is presented as Figure 1.1. The Upper Parramatta River has a number of tributaries that flow into it within the study area. The two largest tributaries are Toongabbie Creek and Darling Mills Creek. Other tributaries include the following: Brickfield Creek; Domain Creek; Finlaysons Creek; Coopers Creek; Pendle Creek (also known as Pendle Hill Creek); Greystanes Creek (also known as Girraween Creek); Grantham Creek; Blacktown Creek; Lalor Creek; Quarry Creek; The Quarry Branch (also known as Northmead Gully); Excelsior Creek; Blue Gum Creek; Rifle Range Creek; Hunts Creek. The Upper Parramatta River catchment includes parts of the following four local government areas (LGAs): Shire of Baulkham Hills — including the suburbs of Oatlands, Carlingford, North Rocks, Northmead, North Parramatta, West Pennant Hills, Castle Hill and Baulkham Hills; City of Blacktown — including the suburbs of Toongabbie, Seven Hills, Prospect, Blacktown, Lalor Park and Kings Langley; City of Holroyd — including the suburbs of Westmead, Wentworthville, South Wentworthville, Greystanes, Pendle Hill, Girraween, Prospect, Toongabbie and Merrylands West; City of Parramatta — including the suburbs of Parramatta, North Parramatta, Westmead, Northmead, Wentworthville, Toongabbie, Old Toongabbie and Winston Hills. OBJECTIVES OF THIS STUDY The primary objective of the current Upper Parramatta River Floodplain Risk Management Study and Plan is to bring together, and place in appropriate context, all past, current and proposed future activities related to the reduction of flood risk in the catchment. In broad terms, the current study has investigated what can be done to minimise the effects of flooding in the Upper Parramatta River catchment and recommended a strategy in the form of a Floodplain Risk Management Plan. As mentioned above, despite the expenditure of more than $35 million on flood mitigation works and measures since 1989, none of the four councils within the area of the Trust have adopted a formal Floodplain Risk Management Plan as required by the New South Wales (NSW) Government’s Flood Prone Land Policy. This study and plan constitute key components of the NSW Government’s floodplain risk management process as outlined in the Floodplain Management Manual (NSW Government, 2001) (see Section 1.4). Some of the objectives of the study include: briefly outlining the hydrological and hydraulic modelling activities that have been undertaken for the catchment to date; briefly reviewing the past, current and future flood-related activities of the Trust and the four constituent Councils; reviewing, in detail, issues relating to planning and development controls within the catchment’s floodplains; identifying additional floodplain risk management measures that particularly relate to community awareness about flooding, the release of flood-related information to the community, flood warning and emergency management; developing a mutually agreeable Floodplain Risk Management Plan for the Upper Parramatta River catchment that outlines the best measures to reduce flood damage, based on environmental, social, economic, financial and engineering considerations. Report The structure of this report is as follows: Chapter 2 summarises the flood problems, together with the behaviour and impacts of flooding in the Upper Parramatta River catchment. Chapter 2 also discusses the modelling of flood flows and flood levels in the catchment; Chapter 3 provides an overview of the previous

Study Area The study area is located in south west Sydney and covers the northern part of the suburb of Chester Hill. It is an urban catchment that drains through a stormwater pipe network in a north-easterly direction to the Parramatta Council Local Government Area (LGA). The Wolumba catchment is one of the sub catchments of Duck River, and is wholly within the north western section of Bankstown City Council (LGA). Outcomes from the Study The main outcomes from this study include:,

Complete report

Study Area The study area is located in south west Sydney and covers most of the suburbs of Chullora and Potts Hill and small parts of the suburbs of Yagoona, Greenacre and Bankstown. It is an urban catchment that drains through a stormwater pipe network and Freshwater Creek in a north-easterly direction to the Cooks River. The catchment is bounded by the Hume Highway to the south and east, and the railway line to the north. The Rookwood Road catchment is wholly within the Bankstown City local government area (LGA). Outcomes from the Study The main outcomes from this study include:,

Volume 1- Main report; Volume 2- Planning

Study Area The study area is located in south west Sydney at the northern end of the suburbs of Revesby and Padstow. It is an urban catchment that drains in an easterly direction through a stormwater pipe and open channel network to Salt Pan Creek, a tributary of the Georges River. The catchment includes the South Western Motorway (M5) east from approximately Queen Street to Salt Pan Creek. The River Road, Gibson Avenue and Fairford Road cross the catchment (and the motorway via overpasses) in approximately a north-south direction. The Fairford Road catchment is wholly within the Bankstown City local government area (LGA). Outcomes from the Study The main outcomes from this study include:,