title: Wallan and Beveridge Flood Mapping council: mitchell state: vic category: constraint classification: MAJOR status: in-progress last_compiled: 2026-05-31 source_docs:
- web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt
- web-research-L1-wallan-flood-mapping-melbourne-water.txt
Wallan and Beveridge Flood Mapping
Melbourne Water is updating flood mapping for Beveridge and Wallan so flood risk can be used in infrastructure planning, housing planning and emergency management decisions. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The available source material indicates a process that has moved beyond initial community evidence gathering and into Step 2 consultation on updated flood maps, but the published technical model outputs, mapped extents, affected parcels and planning scheme amendment material are not included in the corpus. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Background
The project sits within Melbourne Water’s Greater Melbourne Flood Information Program and is being supported by Mitchell Shire Council. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The project covers the towns of Beveridge and Wallan and identifies four mapping workstreams: Boyd Creek, Merri Creek (Upper), stormwater drains and Deep Creek (Lower). (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) Each of the four workstreams is marked as underway in the source page. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
The first engagement stage asked the community to provide past flooding experiences in Beveridge and Wallan, and Melbourne Water states that those contributions were passed to flood modelling specialists. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) Consultation for that engagement stage ran from 4 August 2025 to 24 August 2025. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The source page records a map image showing 3 locations where flooding was reported. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Analysis
Flood Mechanism and Planning Relevance
The mapping program is not a single flood line exercise; it separates flood behaviour into four sources: Boyd Creek, Merri Creek (Upper), stormwater drains and Deep Creek (Lower). (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) This matters because creek flooding and stormwater drainage flooding operate through different planning mechanisms: creek mapping usually affects waterway corridors, flood storage, floor levels and land subject to inundation, while stormwater drain mapping usually affects local overland flow paths, drainage upgrades and site-level building controls. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
The source states that the updated flood information will be used to plan for infrastructure, housing and emergencies. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) In practical planning terms, that creates three downstream decision paths: infrastructure design must account for mapped flood behaviour, housing planning must avoid or manage land with flood exposure, and emergency planning must update guidance for affected communities. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Process, Timing and Statutory Pathway
Melbourne Water describes flood map updating as a lengthy process that generally takes 12 to 18 months before updated maps are shared for review. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The current process table places Beveridge and Wallan at Step 2, which is consultation on updated flood maps and community feedback. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The same process table says Step 2 consultation takes 2 months, Step 2-3 review and finalisation takes 3 to 6 months, final flood maps are then published for decision-making, and authorisation is requested for a Planning Scheme Amendment. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
The key planning implication is that the flood mapping is not merely advisory information; Melbourne Water’s published pathway expressly connects final flood maps to a future Planning Scheme Amendment authorisation request. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) Until the maps are finalised and amendment material is available, the likely planning controls, affected land, overlay boundaries and permit implications cannot be quantified from the available corpus. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Consultation Evidence and Model Validation
The first engagement stage collected community reports of flooding and passed those reports to flood modelling specialists. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The source page records 3 mapped flooding report locations, which is useful as validation evidence but too thin to establish flood extent, frequency, depth, velocity or property-level exposure. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
The next analytical step is model validation against community submissions. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) Melbourne Water’s process table says submissions are reviewed, maps are validated and final flood maps are prepared before publication for decision-making. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) That sequence means community evidence may still change final mapping outcomes, especially where reported flood behaviour conflicts with draft model outputs. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Relationship to Emergency Management
The process table states that updated flood emergency management plans are published at Step 3 after final map publication. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The source page also links to real-time flood alerts, VICSES flood guides and a Community Flood Intelligence Portal for the Goulburn Broken catchment, which includes part of Mitchell Shire. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) VICSES flood guides are described as identifying areas currently at risk of flooding and being revised with updated flood information. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
The planning consequence is that final maps are likely to affect both statutory planning controls and public emergency information. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) This creates a coordination requirement between Melbourne Water, Mitchell Shire Council and emergency management bodies before final information is used consistently across planning certificates, flood guides and emergency plans. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Current Status
Beveridge and Wallan are currently at Step 2 in Melbourne Water’s flood modelling process. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) Consultation for the earlier engagement stage closed after running from 4 August 2025 to 24 August 2025. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) The next stated steps are consultation on updated flood maps, review of community submissions, validation and finalisation of flood maps, publication of final maps for decision-making, request for Planning Scheme Amendment authorisation and publication of updated flood emergency management plans. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Dependencies
- Blocks: Final planning scheme controls, final emergency management plan updates and definitive property-level planning advice cannot be fully settled until final flood maps are published. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
- Blocked by: The project is blocked by completion of Step 2 consultation, review of submissions, validation of the maps and final publication of flood mapping. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
- Informed by: The project is informed by community reports of past flooding, flood modelling specialist review, peer review and preparation of updated flood maps. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
- Implements: The work forms part of the Greater Melbourne Flood Information Program. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
- Conflicts with: No direct conflict is documented in the available source documents. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Cross-Jurisdictional Links
The source page states that future consultation for other parts of Mitchell Shire outside Melbourne Water’s catchment area may be run by Mitchell Shire Council, Goulburn Broken Catchment Management Authority or North Central Catchment Management Authority. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) This indicates that flood intelligence across Mitchell Shire is split between multiple water and catchment authorities, so shire-wide flood planning cannot be understood from Melbourne Water material alone. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Gaps in This Analysis
The corpus contains two extracted web captures of the same Melbourne Water project page and no technical flood study, model report, draft map package, planning scheme amendment documentation, overlay schedule, affected property list, hydrology report, hydraulic model report, consultation submissions report or emergency management plan update. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt) Because those documents are missing, this page cannot quantify flood depths, flood extents, Annual Exceedance Probability scenarios, affected hectares, affected lots, freeboard requirements, floor-level implications, land use constraints or proposed overlay boundaries. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
This should be treated as a corpus gap for _gaps: the primary missing source is the full Beveridge and Wallan flood mapping technical package and any future Planning Scheme Amendment material that translates the final maps into statutory controls. (Source: web-research-L1-wallan-beveridge-flood-mapping-melbourne-water.txt)
Signal-Page Caveat
This is a planning signal page, not a complete deep-dive. It is useful because it identifies a live statutory, infrastructure or constraint issue, but it should not be relied on for final parcel-level advice until the primary technical package, amendment material, agency correspondence and delivery evidence identified in the gaps section are present.