Federation Villages Floodplain Risk Management Study and Plan
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In addition, review of the flood damages results and ‘First Event Flooded’ (Figure 3 Sheets 1-5) can help indicate the areas most at risk of property damage, and clusters of properties frequently affected by flooding. Options are then shortlisted for hydraulic assessment, and if effective, proceed to detailed assessment and multicriteria analysis. Options that are scored positively in the multicriteria analysis are typically included in the Draft Floodplain Risk Management Plan for implementation.
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As part of the community consultation carried out in October 2018, community members provided valuable insight into the key issues in the study area, as well as suggestions for ways to manage flood risk, as described in Section 3.2. This information has been used to both identify potential options, as well as assess the possible social impacts and acceptance of options as part of the more detailed assessment.
Flood Modification Measures
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Flood modification measures aim to modify the behaviour of a flood itself by reducing flood levels or velocities, or by excluding water from areas under threat. Typical measures involve structural works such as levee banks, retarding basins and drainage networks, and are generally installed to modify flood behaviour on a wider scale. Depending on the type of flood behaviour, spatial constraints and catchment conditions, different flood modification measures will be better suited to reducing flood risk than others. A key consideration when assessing potential flood modification options is ensuring that, in the pursuit of reducing flood risk in one area, the option (e.g. a basin or levee) does not adversely affect other areas. Potential flood modification options were identified and assessed for each village, described in detail in the relevant appendices. From this, the following recommendations are made.
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FMBC-02: Boree Creek Western Culvert Upgrades to be further investigated as a measure to manage local drainage. FMBC-03: Boree Creek Kywong Road Upgrade to be further investigated as a possible evacuation route and to manage local drainage.
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FM: Flood Modification Options
FMBC-04/05/06: Boree Creek Railway Line Augmentation to be further assessed if modification or removal of the railway line is considered in the future. FMBC-07: Boree Creek Vegetation Management maintain vegetation levels to minimise impacts on flood behaviour. Can be achieved through other Council programs. FMM-01: Morundah Levee (Carry On) existing level to be maintained, further investigation of levee structural integrity and repair works, as required. FMM-02: Morundah Internal Drainage Improvements (Pipes only) to be implemented to minimise impacts during overland flow events.
118048: R211211_FederationVillagesFRMSP.docx: 11 December 2021
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