Flood Management Plan - Shire of Yarra Ranges

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7.3.4 Priority Areas for Future Flood MappingThe current Water Plan commits Melbourne Water to reduceextreme/intolerable flooding within it’s area by 10% by 2013. As nocatchments within the Yarra Ranges municipality are currently considered tobe at extreme risk, there are no priority areas for future flood mapping basedon flood risk. Flood mapping is currently occurring and planned within themunicipality as detailed in Section 8.2.2.8 Flood Management and MitigationThis section captures works within the Municipality to manage flood risks aswell as what is planned to further improve the management of 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 ofCouncils Civil Infrastructure Asset Management Plan. As part of this study aninvestigation into the drainage network has been undertaken and somepreliminary mapping of possible areas requiring attention has been formed.This information has been passed on to the Shire of Yarra Ranges for furtherevaluation.8.2 Flood Modelling and Mapping - Completing the KnowledgeBaseAccurate survey and modelling of 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 Shire of Yarra Ranges Flood Management Plan
information to support Flood Emergency Planning there is a case forconsidering events up to the probable maximum flood (PMF). This isparticularly important in areas where the level of the PMF could besubstantially higher than the 1% AEP flood level and thus have significantimplications for municipal and regional emergency response planning.8.2.1 Mapping Completed in the MunicipalityMelbourne Water has completed flood mapping in some of the catchmentsthroughout the Shire of Yarra Ranges (over Melbourne Water assets only).Melbourne Water’s current mapping program investigates a range of ARIdurations (5, 10, 20, 50, 100 and PMP events), while older mapping projectsonly consider the 100 year ARI and perhaps the 50 and 20 year ARIs. Figure31 below shows the number of catchments within the Shire of Yarra Rangesthat have had flood mapping completed. Currently 63% of catchments havenot been mapped. 5% of catchments have both the 20 and 50 year ARI eventsmapped and 37% of catchments have the 100 year ARI mapped. Currentlythere are no catchments within the Shire of Yarra Ranges that have the 5year, 10 year or PMP events mapped. Table 2 details the flood mappingprojects completed within the Shire of Yarra Ranges’ catchments.40Number Catchments Mapped353025201510505 Year ARI 10 YearARI20 YearARI50 YearARI100 YearARIPMFNotMappedFigure 31Number of catchments with flood mapping projects completedTable 2Shire of Yarra Ranges – Flood Mapped CatchmentsCatchment Name 5 Year ARI 10 Year ARI 20 Year ARI 50 Year ARI 100 Year ARI PMFBLACKWOOD CREEK No No No No No NoCUMBERLAND CREEK No No No No No NoBELLELL CREEK No No No No No NoBRUSHY CREEK (UPPER) No No Yes Yes Yes NoCHIRNSIDE PARK DRAIN No No No No Yes NoCHERRY HILL DRAIN No No No No Yes NoMelbourne Water Shire of Yarra Ranges Flood Management Plan 49
Page 1 and 2: Flood Management PlanFor Shire of Y
Page 3 and 4: Table of Contents1 Executive Summar
Page 5 and 6: 1 Executive SummaryThis Shire of Ya
Page 7 and 8: Figure 1Flood Management Roles and
Page 9 and 10: ability to respond in an informed a
Page 11 and 12: Figure 2Shire of Yarra Ranges ward
Page 13 and 14: Figure 3Main waterways within the S
Page 15 and 16: 6.4 FloodingFor the purposes of thi
Page 17 and 18: Figure 5100 Year Flood Extent, Shir
Page 19 and 20: Figure 6Study Areas within the Shir
Page 21 and 22: YarraRiver TribDonRiverYarra RiverB
Page 23 and 24: WooriYallockCreekHoddlesCreekSlatyC
Page 25 and 26: MuddyCreekFigure 11Cardinia Creek S
Page 27 and 28: • Bungalook Creek is located in t
Page 29 and 30: OlindaCreekLilydaleEastDrainLogCree
Page 31 and 32: NewChumCreekMyersCreekDonnellyCreek
Page 33 and 34: SteelsCreekDixonCreekPaulsCreekFigu
Page 35 and 36: 6.7.1 Drainage & Assets Investigati
Page 37 and 38: Figure 24Customer Complaints - Shir
Page 39 and 40: Figure 26Engineering Studies - Shir
Page 41 and 42: Emerald SES unit which is located o
Page 43 and 44: BIG PATS CREEK 5840 MediumMISSISSIP
Page 45 and 46: 7.2 Existing Flood Risks within the
Page 47: 7.3.2 Urban Consolidation and Infil
Page 51 and 52: The extents for the 1% AEP event ha
Page 53 and 54: waterways and overland flows within
Page 55 and 56: een and should be taken. This inclu
Page 57 and 58: fund the required drainage upgrades
Page 59 and 60: • To regulate or prohibit any use
Page 61 and 62: 10 Improvement PlanThis Part of the
Page 63 and 64: 567Little known about recreationfac
Page 65 and 66: 161718Location of complaints caninf
Page 67 and 68: 12 How this document was developedT
Page 69 and 70: 13.1 GLOSSARYBelow are terms define
Page 71 and 72: ID Waterway Name ID Waterway Name I
Page 73 and 74: ID Waterway Name ID Waterway Name I
Page 75 and 76: Melbourne Water Shire of Yarra Rang
Page 77 and 78: Melbourne Water Shire of Yarra Rang
Page 79 and 80: APPENDIX B - ROLES AND RESPONSIBILI
Page 81 and 82: APPENDIX C - FLOOD RISK ASSESSMENTB
Page 83 and 84: APPENDIX D - FARM DAMS IN THE SHIRE
Page 85: APPENDIX E - MELWAYS MAPS SHOWING 1
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86 Melbourne Water Shire of Yarra R
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Flood Management Plan - Shire of Yarra Ranges

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