Features current floodplain risk management issues in Lower Wyong River catchment and resulting plan

This report documents the Lake Wyangan Floodplain Risk Management Study and Plan which investigates and presents a flood risk management strategy for the catchment. The study identifies the existing flooding characteristics and canvasses various measures to mitigate the effects of flooding. The end product is the Floodplain Management Plan, which describes how flood liable lands within Lake Wyangan are to be managed in the future.

A number of conclusions can be drawn from the Floodplain Risk Management Study which lead to inclusions in the Floodplain Risk Management Plan. These conclusions are as follows: - The study area (Wyong River and Mardi Creek from Woodbury's Bridge to a point 1.4 kilometres upstream from Tuggerah Lakes) covers some 18.34 sq kilometres. Thirteen(13) percent of the study area is zoned “Wetland Management Zone” while ten (10) percent is zoned as “Open Space”. The remainder is generally cleared and used for residential, commercial/industrial uses and agriculture (grazing). - There are 404 houses on the floodplain with floor levels below the 1% AEP flood level. - There are 148 commercial and light industrial premises on the floodplain. - The total average annual flood damage is some $9.22 million. The ranking of the contributions to flood damage are: - Commercial/Industrial: 82 percent - Public Utilities: 11 percent - Residential: 7 percent - The commercial/industrial damage is virtually all sustained in the Tuggerah Straight Industrial Area. - Wyong Shire Council's development control has been based on their Flood Prone Land Development Policy (circa 1986). The increase in buildings on the floodplain in the past 15 years suggests that the Policy is not achieving its objectives of minimising the financial and emotional cost of flooding. The Flood Policy should be updated and incorporated into a Development Control Plan. The creation of the DCP and its public exhibition will provide greater public awareness of floodplain management and will have greater standing in the Land and Environment Court. It is understood that the development of such a DCP is currently underway. - The Lower Wyong River has an operational flood warning system, though it has not been tested in a large flood. Similarly, the general lack of floods has the potential to create a situation where on-going maintenance of the flood warning system and infrastructure is overlooked. - The 2005 Floodplain Development Manual introduces concepts of:,

Data includes: * Volume 1 - Report Text and Appendicies * Volume 2 - Figures * Volume 1 - MS word version * Individual Figures * Low Resolution Report

Report is two parts:,

Contains Volume 1 - Main Report and Volume 2 - Maps. Contains data relating to Flood Extents, Flood Hazard Zones, Flood Risk Precincts and Hydraulic Categorisation. Files supplied in MAP INFO format.

The Flood Study comprises two volumes: Volume 1: (i.e., this document) comprises the report text and appendices; Volume 2: contains all accompanying report figures

Flood Risk Management Study & Plan - Main report (Part 1 of 4) This Lake Macquarie Waterway Flood Risk Management Study and Plan constitutes a review of the second and third stage of the management process, namely the August 2000 Lake Macquarie Floodplain Management Study and the July 2001 Lake Macquarie Floodplain Management Plan. This review has been prepared by consultant WMAwater for Lake Macquarie City Council and was undertaken following a review of the 1998 Lake Macquarie Flood Study, to include the June 2007 long weekend storm/flood event and incorporation of the implications of climate change. The results of this Waterway Flood Risk Management Study and Plan Review will provide the basis for the future management of flood liable foreshores areas surrounding the Lake Macquarie waterway. The study concentrates on those areas of the foreshore within the boundaries of Lake Macquarie City Council, with no investigation of land within the Wyong local government area.

Spatial outputs from FRMS & P

Report + Appendix