Lake Macquarie Waterway - Flood Study 2012

Brief description

The key objective of this Flood Study is to develop a suitable hydrologic/hydraulic model that\r\ncan project flood and permanent inundation water levels in Lake Macquarie from rainfall, sea\r\nlevel rise and storm surge. These results will be used by Lake Macquarie City Council, in\r\nconsultation with the community of Lake Macquarie City, to manage flood and permanent\r\ninundation risks to low lying land around the Lake Macquarie waterway.\r\nThe key stages in the process are:\r\nUndertaken a comprehensive review of the 1998 Lake Macquarie Flood Study (Part 1 –\r\nReference 1) and develop suitable hydrologic/hydraulic models to define flood behaviour\r\nover the full range of design events for existing catchment conditions,\r\nUse the hydrologic/hydraulic models to assess various climate change scenarios,\r\nincluding application of the NSW Government’s sea level rise benchmarks,\r\nAssess the potential increase in storm surge as a result of climate change and its impact\r\non elevated ocean levels,\r\nReview the potential impact of climate change on the local wind/wave climate as this\r\naffects the extent of wave runup on the foreshore,\r\nAssess the hydraulic and hazard categories for existing and climate change conditions.\r\nThis report details the results and findings of the above investigations. The key elements\r\ninclude:\r\na summary of available historical flood related data,\r\nestablishment of the hydrologic and hydraulic models,\r\ncalibration of the hydrologic and hydraulic models,\r\ndefinition of the design flood behaviour for existing catchment conditions,\r\nsensitivity analysis of the design flood behaviour,\r\nassessment of the impacts of climate change on the still water and wave runup water\r\nlevels\r\nre-definition of the flood extent and hydraulic and hazard categories mapping for existing\r\nand climate change conditions.\r\nA Flood Study is a technical document and not easily understood by the general public. A\r\nglossary of flood related terms is provided in Appendix A to assist. If more explanation of terms\r\nor a better understanding of the approach is required, type “NSW Government Floodplain\r\nDevelopment Manual” into an internet search engine and you will be directed to the NSW\r\nGovernment web site which provides a copy of this manual and further explanation.\r\nFlood levels given in this report relate only to the water level with the lake itself. Design water\r\nlevels in the creek systems entering the lake (Cockle Creek, Dora Creek etc.) will be higher than\r\nthose shown for the lake.

Full description

Lake Macquarie Waterway - Flood Study 2012