Westby flood map & planning overlays
Westby farms 9 ha lots, 73% flood-mapped.
Free map preview, then PDF reports from $9 - about the price of an iced latte on a public holiday.
A planning-constraint profile of Westby
(Gannawarra, VIC) - 20.54 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 15 October 2026.
Constraint readout
20.54 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Westby's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Westby at a glance
How Westby is zoned
Selling in Westby? The zoning and planning overlays on this page are the controls a Section 32 vendor statement discloses.
Across its 20.54 km², Westby is highly constrained by planning overlays. About 73% of the suburb sits within a mapped flood overlay, and 100% is flagged bushfire-prone. The dominant land-use zone is Farming Zone (FZ). The median lot measures about 89,044 m² across 61 parcels.
Who lives in Westby
Census 2021 figures published by the ABS for the Westby suburb boundary itself, not a wider region.
Socio-economic standing
ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.
Score 951, and decile 3 within Victoria. The national average is 1000.
Population trend, 2001 to 2025
Estimated resident population of Gannawarra, the wider ABS statistical area containing Westby. There is no annual population series published at suburb level, so this describes the surrounding area rather than Westby itself.
7,625 in 2001 to 6,522 in 2025, down 14%.
Source: ABS Census 2021 and SEIFA 2021 (Suburbs and Localities), Regional Population (SA2), CC BY 4.0. Small counts are randomly adjusted by the ABS.
Westby data sources and coverage
“Not mapped” means we hold no source layer for this suburb - never an all-clear.
| Dataset | Coverage | Publisher |
|---|---|---|
| Flood mapping | Mapped | Vicmap Planning and Victorian Government spatial services |
| Bushfire-prone mapping | Mapped | Vicmap Planning and Victorian Government spatial services |
| Zoning | Mapped | Vicmap Planning and Victorian Government spatial services |
| Heritage and environment | Mapped where published | Vicmap Planning and Victorian Government spatial services |
| Aircraft noise contours (ANEF) | Not held | Vicmap Planning and Victorian Government spatial services, Defence |
| Observed flight paths | Watched, not yet sampled here | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 15 October 2026. See the methodology and full source list. Source data changes over time and critical decisions should be checked with the responsible authority.
Check a specific Westby address
See exactly which overlays touch a single property - the interactive map is free. Need it on paper? A full planning PDF is just $9.
See what's in the $9 report →Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and the indicative soil reactivity range to expect for a Westby lot.
Westby planning - frequently asked
Is Westby flood-prone?
About 73% of Westby falls within a mapped flood overlay, against the council-wide suburb average of 52%.
Is Westby bushfire-prone?
Around 100% of Westby is mapped as bushfire-prone, compared with a Gannawarra average of 99%.
What is the zoning in Westby?
The dominant planning zone in Westby is Farming Zone (FZ), though the suburb also includes Public Conservation and Resource Zone (PCRZ) and Transport Zone (TRZ2).
Does Westby have heritage-listed places?
No heritage-listed places are on record within Westby.
What is the typical lot size in Westby?
Across 61 surveyed parcels in Westby, the median lot size is about 89,044 m².
Is Westby an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Westby scores 951 and sits in decile 3 of 10 nationally and decile 3 within Victoria (decile 1 is the most disadvantaged tenth, decile 10 the least).
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Capels Crossing | 5.1 km | 85% | 100% |
| Myall (Kerang) | 5.1 km | 36% | 100% |
| Reedy Lake | 8.1 km | 93% | 81% |
| Teal Point | 8.7 km | 24% | 100% |
| Kerang | 9.7 km | 89% | 94% |
| Koondrook | 11.3 km | 44% | 99% |
| Murrabit | 11.6 km | 68% | 100% |
| Lake Charm | 14.0 km | 55% | 92% |
| Koroop | 14.4 km | 64% | 100% |
| Gonn Crossing | 14.8 km | 100% | 100% |