Flood Management Plan - Shire of Yarra Ranges
Flood Management Plan - Shire of Yarra Ranges
Flood Management Plan - Shire of Yarra Ranges
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7.3.4 Priority Areas for Future <strong>Flood</strong> MappingThe current Water <strong>Plan</strong> commits Melbourne Water to reduceextreme/intolerable flooding within it’s area by 10% by 2013. As nocatchments within the <strong>Yarra</strong> <strong>Ranges</strong> municipality are currently considered tobe at extreme risk, there are no priority areas for future flood mapping basedon flood risk. <strong>Flood</strong> mapping is currently occurring and planned within themunicipality as detailed in Section 8.2.2.8 <strong>Flood</strong> <strong>Management</strong> and MitigationThis section captures works within the Municipality to manage flood risks aswell as what is planned to further improve the management <strong>of</strong> existing andfuture flood risks.8.1 Drainage StrategyCouncil’s drainage strategy includes renewal works, new works, maintenanceand improvements within a 20 year time frame. This forms a critical part <strong>of</strong>Councils Civil Infrastructure Asset <strong>Management</strong> <strong>Plan</strong>. As part <strong>of</strong> this study aninvestigation into the drainage network has been undertaken and somepreliminary mapping <strong>of</strong> possible areas requiring attention has been formed.This information has been passed on to the <strong>Shire</strong> <strong>of</strong> <strong>Yarra</strong> <strong>Ranges</strong> for furtherevaluation.8.2 <strong>Flood</strong> Modelling and Mapping - Completing the KnowledgeBaseAccurate survey and modelling <strong>of</strong> floodplains and overland flow paths isrequired to determine flood depths and delineate areas subject to inundationon floodplains and along overland flow paths. This information is aimed atimproving community safety through informed planning (ensuring that newdevelopment is designed to take into account floodplain and overland flowpaths and associated flow depths to ensure no worsening) and emergencyresponse. The mapped information is therefore required not only byMelbourne Water as the floodplain management authority, but also bymunicipal planning departments, emergency response organisations, otherinfrastructure providers, land developers, prospective land purchasers andexisting land owners and occupiers.Melbourne Water’s survey and modelling work for rivers, creeks and maindrains usually generates flood levels and extents for multiple AEP events up tothe 1% AEP (100-year ARI) flood. The 1% AEP event is considered adequatefor managing flood risk and associated issues relating to propertydevelopment and flood mitigation. However, when it comes to generating48 Melbourne Water <strong>Shire</strong> <strong>of</strong> <strong>Yarra</strong> <strong>Ranges</strong> <strong>Flood</strong> <strong>Management</strong> <strong>Plan</strong>