Flood Management Plan - Shire of Yarra Ranges

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Figure 4Drainage Assets within the Shire of Yarra Ranges14 Melbourne Water Shire of Yarra Ranges Flood Management Plan
6.4 FloodingFor the purposes of this report flooding will be defined as any water conveyedoutside of its natural, constructed, or defined waterway. This includes thedrainage pipe network, and defined waterways. Under this definition alloverland flow paths, including many Council roadways are included as floodways.This section describes the mapped 100 year Average RecurrenceInterval (ARI).The extent of the 100 year ARI flood event in the Shire of Yarra Ranges isshown in Figure 5. The flood extent has been determined through previousflood mapping projects undertaken by Melbourne Water. Those areas likely tobe impacted by flooding have been designated Land Subject to Inundation(LSIO) Overlay and Special Building Overlay (SBO) overlays. Flooding in theShire is mainly confined to the section of the Yarra River located downstreamof View Street. There are currently 6,043 properties (mostly residential)identified within the defined 100 year flood extent. Properties within thedefined 100 year flood extent have a portion of or all of the propertyinundated by floodwater and is irrespective of water depth or floor level.Prior to the construction of the Upper Yarra Dam, major floods were recordedalong the Yarra River in 1891, 1904, and 1923, with the worst floods recordedin 1934. The peak inundation extent from the 1934 flood is used to currentlydefine the Yarra River’s floodplain bounds. Since the 1934 flood, the UpperYarra Dam was constructed, as the dam is not a flood protection structure, thelikelihood of similar inundation cannot be dismissed. Minor flooding in YarraGlen and along the Watts River occurs on an almost annual basis. Landslipsare also a potential hazard in the Dandenong’s during heavy rainfall periods.In terms of property inundation, unconfined flooding is a greater hazard thanconfined flooding. Water that is unconfined will likely run into properties androads situated at low lying points. Confined flooding areas are usuallydesignated flood overlay zones, with building floor levels raised for protection.In terms of safety risks however, velocities are generally higher through theconfined flood channels. Property inundation flooding within the Shire rangesfrom minor nuisance flooding through to major flooding with water levelsexceeding floor levels.Most of the areas flood mapped within the Shire of Yarra Ranges have beencompleted for the Melbourne network only (>60ha catchments). The numberof properties within the flood extent is expected to be higher once theproperties subject to inundation in smaller catchments (managed by theShire) are identified. The existing 100 year ARI flood extent is shown in Figure5 and demonstrates that a significant portion of the Shire has not been floodmapped.Melbourne Water Shire of Yarra Ranges Flood Management Plan 15
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: Figure 3Main waterways within the S
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 and 48: 7.3.2 Urban Consolidation and Infil
Page 49 and 50: information to support Flood Emerge
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
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161718Location of complaints caninf
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12 How this document was developedT
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13.1 GLOSSARYBelow are terms define
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ID Waterway Name ID Waterway Name I
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ID Waterway Name ID Waterway Name I
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Melbourne Water Shire of Yarra Rang
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Melbourne Water Shire of Yarra Rang
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APPENDIX B - ROLES AND RESPONSIBILI
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APPENDIX C - FLOOD RISK ASSESSMENTB
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APPENDIX D - FARM DAMS IN THE SHIRE
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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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