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NSW Flood Data Portal

Floodplain Risk Management Study and Plan

Killarney Vale / Long Jetty Catchments Floodplain Risk Management Study & Plan

Objective

The primary goal of the project was to quantify the nature and extent of the existing flooding problem and evaluate options that could be potentially implemented to manage the existing, future and continuing flood risk.

Catchment Description

The catchments are significantly urbanised and many of the original creeks and gullies have been built over and replaced by stormwater pipes. A handful of open channels remain, including Saltwater Creek which also includes several detention basins that serve to reduce the impact of flooding across downstream properties.

Flooding

The capacity of the open channels, detention basins and stormwater pipes can be exceeded during heavy rainfall in the local catchments leading to “mainstream” flooding as well as “overland” flooding. Flooding has been experienced across both catchments on a number of occasions in the past including 1981 as well as more recently in 2007 and 2010. The 1981 flood, in particular, inundated multiple properties within the Saltwater Creek catchment and is onsidered to be larger than the 1% AEP design flood.

Flooding of the lower lying areas adjoining Tuggerah Lake can also occur during heavy rainfall in the broader Tuggerah Lake catchment. However, inundation from Tuggerah Lake across the foreshore areas was previously assessed as part of the ‘Tuggerah Lakes Floodplain Risk Management Study and Plan’ (WMAwater, 2014) and was not considered further in this study. Therefore, the ‘Tuggerah Lakes Floodplain Risk Management Study and Plan’ must be reviewed in conjunction with this report to understand the potential flood risk across the forehore areas. Council will ultimately consolidate the flooding information from the various interacting floodplains and associated reports to delineate the extent of the floodplain and the most appropriate flood risk management measures for particular locations.

Additional Information

Field Value
Title Killarney Vale / Long Jetty Catchments Floodplain Risk Management Study & Plan
Publication Date 31 March 2021
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Author/ Prepared by Catchment Simulation Solutions
Publish date 1 June 2021
Update date 23 August 2021
Place Name Killarney Vale / Long Jetty
Approval State Approved
Submitted for approval 23 August 2021
Submitted by Richard Murphy
Approved 23 August 2021
Approved by dstazic
Data Comment

The files that are provided as part of the final deliverables for the "Killarney Vale/Long Jetty Floodplain Risk Management Study and Plan" include following folders: The ‘Assessments’ folder in which contains workings of specific assessments carried out within the project such as cost estimates and flood damages. The ‘Data’ folder contains base GIS data for the study such as aerials, cadastre, LiDAR data. The ‘Post Processed Model Results’ folder contains a range of GIS files including TUFLOW outputs (clipped results grids, pipe capacity), emergency response classifications and flood planning information (flood planning area). The ‘Hydrology’ folder contains the hydrologic data for the study including the verification RAFTS model and Storm Injector project. The 'Hydraulics' folder contains all TUFLOW model input and model output files for existing as well as flood mitigation model runs. It also includes the model outputs in WaterRIDE format for each flood simulation completed. The 'Report' folder includes Volume 1 (report text) in Word and PDF format and Volume 2 (figures). Both high and low resolution versions of each PDF volume are provided. Further “readme” files are provided in the relevant subfolders to provide further detailed information on the contents of each folder, where considered necessary.

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