Seymour flood map & planning overlays
A planning-constraint profile of Seymour
(Break O'Day, TAS) - 17.39 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 3 October 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
17.39 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Seymour's boundary, with the flood, bushfire and environmental overlays drawn on top.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Seymour
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 to
Night movements: not established - night is sampled as often as day, but too few night flights have been seen here to conclude 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.
Seymour at a glance
How Seymour is zoned
Buying in Seymour? The zone and code overlays on this page are the Tasmanian Planning Scheme controls a section 337 certificate reports for a title.
Across its 17.39 km², Seymour is highly constrained by planning overlays. About 38% of the suburb sits within a mapped flood overlay, and 97% is flagged bushfire-prone. The dominant land-use zone is Agriculture. The median lot measures about 28,122 m² across 112 parcels.
Who lives in Seymour
Census 2021 figures published by the ABS for the Seymour 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 920, and decile 4 within Tasmania. The national average is 1000.
Population trend, 2001 to 2025
Estimated resident population of St Helens - Scamander, the wider ABS statistical area containing Seymour. There is no annual population series published at suburb level, so this describes the surrounding area rather than Seymour itself.
5,830 in 2001 to 7,219 in 2025, up 24%.
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.
Seymour 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 3 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 Seymour 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 40 Seymour addresses (+$9 with the planning report).
See what's in the $9 report →Seymour planning - frequently asked
Is Seymour flood-prone?
About 38% of Seymour falls within a mapped flood overlay, against the council-wide suburb average of 13%. Modelled flood depth, velocity and flood level are held for about 40 Seymour addresses, from published flood studies; the free check on the Flood Model Report page says whether a model reaches a given address.
Is Seymour bushfire-prone?
Around 97% of Seymour is mapped as bushfire-prone, compared with a Break O'Day average of 99%.
Is Seymour under a flight path?
No aircraft were observed over Seymour in the period sampled (recent weeks to now). 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 Seymour?
The dominant planning zone in Seymour is Agriculture, though the suburb also includes Environmental Management and Landscape Conservation.
Does Seymour have heritage-listed places?
No heritage-listed places are on record within Seymour.
What is the typical lot size in Seymour?
Across 112 surveyed parcels in Seymour, the median lot size is about 28,122 m².
Is Seymour an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Seymour scores 920 and sits in decile 2 of 10 nationally and decile 4 within Tasmania (decile 1 is the most disadvantaged tenth, decile 10 the least).
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Douglas River | 7.0 km | 30% | 100% |
| Chain Of Lagoons | 8.9 km | 14% | 100% |
| Douglas-Apsley | 9.7 km | 9% | 100% |
| Gray | 11.7 km | 6% | 100% |
| Bicheno Glamorgan-Spring Bay |
17.5 km | 20% | 99% |
| Four Mile Creek | 17.9 km | 10% | 100% |
| St Marys | 18.5 km | 12% | 100% |
| Cornwall | 23.2 km | 3% | 99% |
| Falmouth | 24.5 km | 16% | 99% |
| Royal George Northern Midlands |
25.0 km | 8% | 100% |