Flood reserve projects 2015–16

Twenty-three projects valued at $7,538,687 have been activated from the reserve list for the 2015‑16 Floodplain Management Program. One project valued at $2,009,333 was activated from the reserve list in December 2015 and an additional 22 projects valued at $5,529,354 were activated from the list in March 2016.

Project summaries

Blue Mountains City Council

Wattlecliffe Levee Wall

According to the Lapstone, South Glenbrook and South Blaxland Floodplain Risk Management Study and Plan, properties within the Wattlecliffe Estate will be impacted by 1% Annual Exceedance Probability Flood (AEP) flood events. The Wattlecliffe Estate is in a high hazard area with flood depth up to 0.5 metres. A low wall will be constructed on the footpath between the Great Western Highway, Acacia Place and Wattlecliffe Drive, Blaxland to divert the 1% AEP overland flow into the exiting pit inlet.

Cessnock City Council

Swamp Creek Flood Mitigation Works - Environmental Investigation and Design

This project represents the first stage in the implementation of vegetation clearing works along Swamp Creek at Abermain and Weston. Recent investigations, as part of the Floodplain Risk Management Study and Plan, shows that this will have significant benefit in reducing flood levels and flood damage in these townships. The work will include ecological and geotechnical investigations to identify the potential environmental impacts of the proposed works, and will also involve further design to prioritise the vegetation clearing activities.

Cessnock City Council

Wollombi Flood Warning System - Investigation and Design, Stage 4

This project will implement recommendations from the Floodplain Risk Management Plan (FRMP) by further investigating a potential ‘Flood Warning System’ in association with the Bureau of Meteorology  and State Emergency Services (SES). It will include the options for flood warning enhancement, including appropriate gauge/reporting locations, integration into existing flood warning systems, installation, operating costs, ownership, management and maintenance requirements, liability, and responsibility. The study will identify opportunities to improve emergency management to assist the SES and Rural Fire Service commands covering this area of the Wollombi Village and surrounds.

Coonamble Shire Council

Coonamble levee upgrade - Stage 2

Previous studies have identified that the upgrade of the levee is a high priority for the protection of the town. Council has split the upgrade into workable stages to ensure the successful completion of the project. Stage 1 of the levee is already complete and has upgraded 2000 metres of levee. This stage will upgrade from 400 metres north of King Street to the Coonamble Hospital and from Taloon Street to Macquarie Street.

Gosford City Council

Woy Woy Floodplain Risk Management Study and Plan

The Woy Woy Peninsula is prone to flooding, especially during long-duration rain events. Flooding occurs both in road reserves and on numerous residential properties throughout the peninsula.

A Flood Study was completed in 2010 as the first stage of the Floodplain Risk Management Process. The flood study determined the nature and extent of flooding. A floodplain risk management study and plan is now required to progress the floodplain risk management process and identify and investigate various options to manage the identified flood risks in the flood prone areas of the Woy Woy Peninsula. This will determine action that should mitigate, or at least, reduce the impact of future flood events.

Gosford City Council

Davistown and Empire Bay Floodplain Risk Management Study and Plan

The foreshore areas of Davistown and Empire Bay have been subjected to flooding and inundation due to catchment rainfall and also stormwater inundation from the Brisbane Water estuary. The Flood Study, which is the first stage of the Floodplain Risk Management process, has determined the nature and extent of flooding. The Floodplain Risk Management Study and Plan will investigate various options to manage the risk of flooding and inundation of properties in the catchment of Davistown and Empire Bay. A management plan will be prepared which will recommend development controls and/or mitigation works to minimise potential damage in future flood events.

Lake Macquarie City Council

LT Creek Floodplain Risk Management Study and Plan

LT Creek is a drainage catchment extending north east of the township of Fassifern in the City of Lake Macquarie. LT Creek drains into the Lake Macquarie waterway at the end of Fennell Street, Fassifern and covers an area of approximately 748 hectares. The catchment has a diversity of land uses with rural land in the upper reaches and some residential land affected by flooding in the lower reaches at Fassifern. Council will formulate a comprehensive Floodplain Risk Management Study and Plan for the catchment.

Narrabri Shire Council

Wee Waa Levee Risk Management Study and Plan

Wee Waa is situated on the Namoi River floodplain near the confluence of the Namoi River and the Wee Waa Lagoon. The town has a population of approximately 1700 and is situated in the middle of the Namoi River floodplain. During large flood events, floodwaters spread out over the floodplain, reaching significant depths and affecting large areas of agricultural land. The majority of Wee Waa’s residential, commercial and industrial properties are protected by an existing earthen levee that surrounds the town. Council recently received a report into the effectiveness of the Wee Waa Levee to withstand the regular flooding experienced in the lower Namoi River Valley. The study has identified that the levee does not protect the town from a one percent Annual Exceedance Probability (AEP) flood with sections of it being overtopped. Council will prepare a Flood Plain Risk Management Study and Plan to assist in determining the most effective means of protecting the town.

Newcastle City Council

Wallsend Commercial Area Flood Risk Management Plan - Detailed Design

The risk of flooding in the Wallsend commercial area is significant and in the June 2007 event inundation depths of up to 2 metres was experienced in shops and commercial buildings. A Floodplain Risk Management Plan (FRMP) was prepared in 2009 to outline a strategy to reduce flood risk in the commercial area. The recommended strategy proved to be expensive requiring a substantial amount of funding to reduce the risk of flood. The Draft Wallsend Central Business District Floodplain Risk Management Plan - Implementation Study of 2015 was prepared to investigate more cost effective solutions to flooding based on the findings of the 2009 FRMP. The Implementation Study identified a number of targeted options to reduce flood risk for the commercial area of Wallsend with a positive cost benefit ratio. A preferred option has been selected in consultation with stakeholders and the community. The preferred option involves the removal of the Tyrrel and Boscawen Street bridges and modification of the Nelson Street Bridge to improve conveyance of flood water in the open channel. During the June 2007 event these bridges were subject to near complete blockage and flows surcharged into adjacent areas as a result. Detailed design of the preferred option will allow for a better understanding of the costs and construction requirements associated with the preferred option.

Parramatta City Council

Installation and operation of a flood warning system for the Parramatta River

The Parramatta River is the major river in the Parramatta Council area. It flows close to thousands of homes and businesses, including those of the Westmead Biomedical Precinct which is Australia's largest healthcare, medical research and medical education precinct and also the Parramatta Central Business District where tens of thousands of employees work. Currently there is no early warning system for flooding along the Parramatta River. Council wishes to install a warning system to allow NSW State Emergency Service, Police, Council, businesses and residents time to take actions to reduce flood risks to life and property or to evacuate. This project will upgrade and connect rain gauge and stream gauge networks in the catchment to provide an early flood warning system.

Penrith City Council

Penrith Central Business District Catchment Floodplain Risk Management Study and Plan

This project will undertake a Floodplain Risk Management Study and develop a Floodplain Risk Management Plan for the Penrith central business district. The catchment study area is about 340 hectares.

Penrith City Council

St Marys Catchment Floodplain Risk Management Study and Plan

This project will undertake a Floodplain Risk Management Study and develop a Floodplain Risk Management Plan for the St Marys Catchment study area which is about 310 hectares (total catchment 516 hectares).

Port Macquarie-Hastings Council

Detailed Hibbard floodway investigation

The Hastings River Floodplain Risk Management Study (2012) indicated the need for further investigation into floodway definition in the area of Hibbard in Port Macquarie. A detailed investigation to assess management options for the floodway between Fernbank Creek and Hibbard precinct will be undertaken.

Port Macquarie-Hastings Council

Hastings River climate change modelling

The Hastings Floodplain Risk Management Study (2012) and Plan (2013) recommend that Council commission a study to investigate the full range of implications for flooding associated with Climate Change. This project involves an update of the Hastings Flood Study to take into account Climate Change scenarios.

Port Macquarie-Hastings Council

Wrights Creek Flood Risk Management Study and Plan

This project involves the formulation of a Flood Risk Management Study and Plan which aims to manage the flood risk within the Wrights Creek catchment. The project also aims to update the Wrights Creek Flood Study (2007) to incorporate climate change research and accommodate current Government policy.

Randwick City Council

Birds Gully and Bunnerong Creek flood study

This project will undertake a Flood Study. The catchment is located within the Randwick and Botany Bay Council areas and is approximately 10.85 square kilometres with a population of 45,000. The catchment is a highly urbanised and commercial area. There are numerous properties at risk of flooding within this area.

There are 2020 properties within Randwick and 184 properties within Botany Bay Council areas that are located in topographically low areas that rely on a low capacity drainage network. Sydney Water's Asset Strategy team identified the Bunnerong system as high priority and have indicated preliminary support for identifying flood risk and management options in future stages.

Wagga Wagga City Council

Wagga Wagga Main City & North Wagga Levee Construction - Stage 1 (SFMP)

This project represents the first stage of construction in the upgrade of the Wagga Wagga levee protection system, encompassing the Main City Levee, to provide appropriate levels of protection. Currently, the Main City Levee does not provide protection against the one percent Annual Exceedance Probability design flood event in the Murrumbidgee River which places the Wagga Community at risk in the event that a flood of this magnitude occurs. Within this Stage 1 project, construction of the first section of the Main City levee (approximately 2.1 kilometres), will be completed to provide a 1% Annual Exceedance Probability design flood level of protection (with freeboard) within this section.

Wagga Wagga Major Overland Flow Flood Risk Management Study and Plan Stage 2

The project will provide appropriate planning controls and flood mitigation measures for overland flooding in the urban and adjoining areas of Wagga Wagga. The study will break the area into four catchments, being the North Wagga Hydraulic Extent, the East Wagga Hydraulic Extent, the Lake Albert Hydraulic Extent and Wagga City Hydraulic Extent, looking at inundation areas and velocity/depth values across the catchments. The project will:

  • look at floor levels
  • examine damage potential
  • look at a variety of flood mitigation options
  • make relevant recommendations
  • investigate failure implications of Crooked Creek levee
  • investigate risk to life of other areas in terms of the one percent Annual Exceedance Probability and Probable Maximum Flood flooding, and define the Flood Planning Area for all four areas.

Weddin Shire Council

Emu Creek Stream Management Plan Implementation

The implementation of the Emu Creek Stream Management Plan involves the removal of sediment and dumped fill, removal of vegetation obstructing flows, plantings for bank stabilisation, improvements for fence crossings, construction to stabilise erosion and weed management. Priority locations have been identified for each of these activities throughout Emu Creek and its tributaries. This project will complete these works in the priority locations, monitor their success and continue to manage the impacts over three years. These works will mitigate flooding impacts and improve environmental outcomes within the Emu Creek catchment and its tributaries around Grenfell.

Wollongong City Council

Concept Design - Lower Gurungaty Causeway

This project will develop a concept design for the proposed lowering of a causeway over the Gurungaty Waterway near the outlet of the Wollongong City catchment. This causeway was used in the past by Ports Corp but a new bridge has been constructed and so the older causeway is no longer required. The causeway has flood impacts on many properties upstream and has been identified in the Wollongong City Floodplain Risk Management Study and Plan as the highest importance project to be undertaken in that Plan.

Wollongong City Council

Review of Hewitt’s Creek Floodplain Risk Management Study and Plan

Council is currently completing a review of the Hewitt’s Creek Flood Study. This will establish the basis for the proposed review of the Hewitt’s Creek Floodplain Risk Management Study and Plan, which will identify and prioritise measures to manage flood risk in the study area. The Plan will address the existing, future and continuing flood risk for both existing and future development.

Wollongong City Council

Review of Towradgi Creek Floodplain Risk Management Study and Plan

Council has recently completed the Review of Towradgi Creek Flood Study. The next stage is to prepare the Floodplain Risk Management Study and Plan to determine flood mitigation measures to manage flood risk.

Young Shire Council

Young Stormwater Upgrade Scheme Concept Design Study - Stage 3

Young Shire Council have recently completed their Floodplain Risk Management Study and Plan. This plan identified the need for a concept design study as one of its highest priority actions in order to upgrade the stormwater system and reduce the risk of flooding in Young. In recent years, residential and commercial properties in Young have experienced damage as a result of flooding. The design will provide Council with a cost estimate in order to determine a priority listing for future construction works. The future works will alleviate existing flooding issues and provide for future development within the town. In combination with appropriate planning controls, the stormwater upgrades to be considered in the design will reduce the risk of future flood damage.

 

Page last updated: 20 April 2016