The Culcairn, Henty and Holbrook Flood Studies (the studies) were initiated as a result of flooding of residential areas, most notably in October and December 2010 but also in early 2011. Primarily, the study was developed in order to meet the objective of defining the flood behaviour (5 year ARI, 10%, 5%, 1%, 0.5% AEP events and the Probable Maximum Flood (PMF)) in the townships of Culcairn, Henty and Holbrook and to:
- Define flood behaviour in terms of flood levels, depths, velocities, flows and flood extents within the study area (provided electronically to Council);
- Prepare flood extent mapping (for all design events modelled);
- Prepare provisional flood hazard category mapping for the 5% and 1% AEP events as well as the PMF;
- Provide hydraulic category mapping as well as a discussion of the method used relative to other guidelines and methods;
- Provide Interim Flood Planning Area maps (FPAs);
- Identify flooding “hotspots” – existing and future – for further consideration as part of the FRM Study and one associated with flood risk on land proposed for upzoning by Council; and to
- Create a modelling system that might be used in the subsequent FRMS&P to test whatever flood mitigation works might be proposed by either the community, OEH, Council or the consultant.
