Study Objective

The objective of the Wyalong and West Wyalong Flood Study was to define the nature of both Main Stream Flooding and Major Overland Flow at the twin towns of Wyalong and West Wyalong for flood frequencies ranging between 20 and 0.2 per cent Annual Exceedance Probability (AEP), as well as for the Probable Maximum Flood (PMF).

The findings of the Wyalong and West Wyalong Flood Study will be used as the basis for preparing the future Wyalong and West Wyalong Floodplain Risk Management Study and Plan (Wyalong and West Wyalong FRMS&P) which will assess options for flood mitigation and prepare a plan of works and measures for managing the existing, future and continuing flood risk in the twin towns.

Background Information

The study area comprises the urbanised parts of Wyalong and West Wyalong, as well as their immediate environs. Runoff generated by the study area generally concentrates along the alignment of the following three main flow paths:

• the main arm of Yiddah Creek which generally runs in an easterly direction to the south of the urbanised parts of the twin towns;

• an unnamed watercourse which generally runs in an easterly direction through the urbanised parts of the twin towns and has been denoted herein as “the Main Drain”; and

• an unnamed flow path that runs in an easterly direction to the north of the urbanised parts of Wyalong and has been denoted herein as “the Wyalong North Drainage Line”.