VC317 explained: what Victoria's new risk-based flood controls mean for your next project

If you own, buy or develop land anywhere near a creek, river, drain or the coast in Victoria, the rules just changed. Amendment VC317 has been gazetted into the Victoria Planning Provisions and every planning scheme in the state, and it rewrites how flooding is handled in planning. Here's what it does, what it doesn't do (yet), and what it means for you.

The short version

VC317 replaces the old "you're either in a flood overlay or you're not" approach with a risk-based rating system, similar in spirit to the bushfire approach Victoria has used for the past decade. It:

• updates state flood policy at Clause 13.03 (Flood), which now puts protection of human life ahead of other considerations in high, very high and extreme risk areas

• introduces a new Flood Management Zone (FMZ, Clause 37.11)

• introduces a new Flood Management Overlay (FMO, Clause 44.09) with three schedules: moderate, high and very high risk

• ties those controls to five Flood Risk Ratings (FRR 1–5) set by the state
  

The headline benefit: in genuinely low-risk areas, you won't need a planning permit for flooding at all. It will be dealt with through the building system instead.

The five flood risk ratings

The ratings were developed by the Department of Energy, Environment and Climate Action (DEECA) and are applied to flood maps by Melbourne Water and the regional Catchment Management Authorities. Each rating lines up with a planning outcome:

Rating	What it means	Planning control
FRR 1 – Low	Risk can be managed through minimum building standards	None. Building approval only
FRR 2 – Moderate	Safe for most people; many developments supportable if designed well	FMO – Moderate schedule
FRR 3 – High	Unsafe for children and older people, particularly if access is cut	FMO – High schedule
FRR 4 – Very high	Unsafe for people and vehicles; intensification generally discouraged	FMO – Very High schedule
FRR 5 – Extreme	Active flow paths and flood storage; development generally inappropriate	Flood Management Zone

One detail worth knowing: unlike most zones, the FMZ follows the actual extent of extreme flood risk, not property boundaries. Part of a lot can be in the FMZ while the rest keeps its normal zoning.

What changes for permit applications

Use. Where the FMO sits over another zone, the more restrictive rule wins. If a use is allowed in the zone but prohibited by the overlay, it's prohibited. Vulnerable uses are prohibited in the high and very high schedules.

Community and sensitive uses. State policy now says child care centres, schools, aged care and similar facilities should sit outside the 1% AEP (1-in-100-year) flood extent unless the risk can be safely managed through siting, access and design. Emergency services and hospitals should be outside it and, where practicable, above the Probable Maximum Flood. If you're planning a childcare centre or similar, flood mapping now needs to be one of the first things you check.

Buildings and works. Most buildings and works in the FMZ and FMO need a permit. Some minor works are exempt, such as open-style fencing and underground services.

Subdivision. No new lots can be created in the FMZ (boundary realignments aside), and you can't create a vacant lot that sits entirely within the high or very high schedules. A new lot needs enough lower-risk land for a building envelope and safe access. The moderate schedule is more flexible.

Flood risk reports. In the FMZ and the high and very high FMO schedules, you'll need to lodge a flood risk report with your application unless a local floodplain development plan has been incorporated into the scheme. The report should be scaled to the proposal: a single dwelling might need a short, simple report, while a larger project will need specialist input.

Referrals. Applications go to the floodplain management authority (Melbourne Water or the relevant CMA) unless council has a written agreement with them covering that type of development.

Every application. Clause 65 decision guidelines now require council to consider flood risk on all applications, whether or not a flood control applies to the land.

What VC317 doesn't do (yet)

This is the part that's easy to miss. VC317 puts the new tools into the planning system, but the new zone and overlay will be rolled out progressively as new or updated flood studies are completed and brought into schemes through state-led amendments. Melbourne Water is releasing updated mapping across greater Melbourne in stages over the next few years.

Until that happens for your area, the existing controls still apply: the Land Subject to Inundation Overlay, Floodway Overlay, Special Building Overlay and Urban Floodway Zone. For a while, different parts of Victoria will be operating under different flood rules, so it's important to check exactly which set applies to your site.

What this means for you

If you're buying land: check the state's new Flood Risk Rating tool (searchable by address) alongside the planning property report. Ratings will appear once the new controls are applied, and they'll tell you a lot about what can realistically be built.

If you're developing: factor flood risk into feasibility early, not after design. A site rated moderate may be very workable with good design and safe access. A site rated high or very high could rule out certain uses or lot configurations entirely.

If your land is currently in an LSIO or SBO: it may be re-mapped under the new system. Some land could end up with a lighter control than today; some could end up with a stricter one. It's worth keeping an eye on amendments in your municipality.

If you're in a low-risk area: this is good news. FRR 1 land won't need a planning permit for flood purposes, which should mean fewer delays.