Triabunna flood map & planning overlays
A planning-constraint profile of Triabunna
(Glamorgan-Spring Bay, TAS) - 174.05 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 26 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
174.05 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Triabunna's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Triabunna
Two different things, kept apart on purpose. The ANEF contour is the planning instrument - a forecast published per airport that planning schemes use to control noise-sensitive development. Observed overflight is what a sampled aircraft-tracking feed actually recorded over the suburb - where aircraft flew, how low and how often.
Observed overflight - sampled 4 Sep to 26 Sep 2026
Night movements: not established - night is sampled far less often than day and nothing can be concluded either way.
Traffic is sampled rather than watched continuously, so every figure is a floor: aircraft not captured between samples are not represented. Rates are per 500 m square - the busiest square in the suburb, not a count of flights over the suburb - and a square is only rated where enough traffic was seen to measure it. Altitudes are above mean sea level. Flight paths change with runway use, weather, season and airspace design. This is a record of observed traffic; it is not a noise contour and not a planning control.
Triabunna at a glance
How Triabunna is zoned
Buying in Triabunna? The zone and code overlays on this page are the Tasmanian Planning Scheme controls a section 337 certificate reports for a title.
Across its 174.05 km², Triabunna is highly constrained by planning overlays. About 9% of the suburb sits within a mapped flood overlay, and 99% is flagged bushfire-prone. There are 8 heritage-listed sites on record, and the dominant land-use zone is Agriculture. The median lot measures about 1,912 m² across 925 parcels.
Who lives in Triabunna
Census 2021 figures published by the ABS for the Triabunna 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 857, and decile 1 within Tasmania. The national average is 1000.
Age profile
Share of Triabunna's 905 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Triabunna - Bicheno, the wider ABS statistical area containing Triabunna. There is no annual population series published at suburb level, so this describes the surrounding area rather than Triabunna itself.
3,987 in 2001 to 5,303 in 2025, up 33%.
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.
Triabunna 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 | the Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Bushfire-prone mapping | Mapped | the Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Zoning | Mapped | the Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Heritage and environment | Mapped where published | the Tasmanian Planning Scheme and the LIST (Land Tasmania) |
| Aircraft noise contours (ANEF) | Not held | the Tasmanian Planning Scheme and the LIST (Land Tasmania), Defence |
| Observed flight paths | Observed | adsb.lol, under the Open Database License |
| Demographics | Available | Australian Bureau of Statistics (2021 Census and SEIFA) |
Profile last materially updated 26 September 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 Triabunna 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.
Published flood models are held here: a Flood Model Report is available for about 740 Triabunna addresses (+$9 with the planning report).
See what's in the $9 report →Triabunna planning - frequently asked
Is Triabunna flood-prone?
About 9% of Triabunna falls within a mapped flood overlay, against the council-wide suburb average of 16%. Modelled flood depth, velocity and flood level are held for about 740 Triabunna addresses, from published flood studies; the free check on the Flood Model Report page says whether a model reaches a given address.
Is Triabunna bushfire-prone?
Around 99% of Triabunna is mapped as bushfire-prone, compared with a Glamorgan-Spring Bay average of 96%.
Is Triabunna under a flight path?
No aircraft were observed over Triabunna in the period sampled (4 Sep 2026 to 26 Sep 2026). Sampling is intermittent, so that is a floor rather than proof that none fly over. Traffic is sampled rather than watched continuously and flight paths change with runway use, weather and season; the ANEF contour is the planning instrument.
What is the zoning in Triabunna?
The dominant planning zone in Triabunna is Agriculture, though the suburb also includes Rural and Environmental Management.
Does Triabunna have heritage-listed places?
Triabunna has 8 heritage-listed places on record.
What is the typical lot size in Triabunna?
Across 925 surveyed parcels in Triabunna, the median lot size is about 1,912 m².
What is the population of Triabunna?
At the 2021 Census Triabunna had 905 usual residents, with a median age of 51 and an average household size of 2.2 people. The wider Triabunna - Bicheno statistical area, which contains Triabunna, went from 3,987 people in 2001 to 5,303 in 2025, up 33%.
Is Triabunna an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Triabunna scores 857 and sits in decile 1 of 10 nationally and decile 1 within Tasmania (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Triabunna?
Median household income in Triabunna was $919 a week at the 2021 Census, against $972 for the typical suburb in Glamorgan-Spring Bay. Median rent was $245 a week and the median mortgage repayment $942 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Orford | 12.6 km | 6% | 96% |
| Spring Beach | 14.3 km | 3% | 100% |
| Pontypool | 15.9 km | 12% | 100% |
| Buckland | 16.0 km | 5% | 100% |
| Little Swanport | 17.3 km | 13% | 100% |
| Swanston Southern Midlands |
20.3 km | 6% | 100% |
| Rheban | 21.8 km | 12% | 99% |
| Stonehenge Southern Midlands |
22.3 km | 8% | 100% |
| Maria Island | 25.0 km | 12% | 100% |
| Woodsdale Southern Midlands |
27.7 km | 4% | 100% |