Introduction

This document comprises the Floodplain Risk Management Study and Plan (FRMS&P). It describes the flooding problem in the Winding Creek and Lower Cockle Creek catchment and assesses a number of floodplain risk management measures.

Methodology

The agreed methodology to undertake the FRMS&P is summarised as follows;

• Compilation and review of available information;
• Review of Flood Study, including;
• Review of the new 2013 IFD rainfalls to compare with the current 1987 IFDs;
• Review of the June 2007 flood event records and advise if the design floods presented in the Flood Study are a realistic estimate of the flood risk in the Winding Creek and Cockle Creek catchments – supported by analysis and discussion of the available IFD data for the 2007 flood and re-evaluation of the design floods using the new AR&R IFD parameters.
• Establish impacts of climate change on flood levels (for the 1% AEP event);
• Assess the flooding issue in the study area, including;
• Identify key locations for flood management known as flooding hot-spots;
• Establishing hydraulic categories – floodway, flood storage or flood fringe;
• Develop true hazard categories;
• Identify emergency response classifications;
• Flood damages assessment to identify potential flood damages under current conditions to be compared with costs associated with potential mitigation works;
• Review of current flood planning controls and emergency management.
• Assessment of risk management options to identify practical options for Winding Creek and Lower Cockle Creek through options including;
• Flood modification;
• Property modification; and
• Response modification.
• Community consultation; and finally
• The preparation of the Floodplain Risk Management Plan.