Rosny flood map & planning overlays
A planning-constraint profile of Rosny
(Clarence, TAS) - 0.77 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
0.77 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Rosny's boundary, with the flood, bushfire and environmental overlays drawn on top. Magenta is where aircraft were observed in the sampled period, brightest below 3,000 ft.
Nearby suburbs, nearest first
Aircraft noise and flight paths over Rosny
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
typical observed square 1 a day
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.
Rosny at a glance
How Rosny is zoned
Buying in Rosny? The zone and code overlays on this page are the Tasmanian Planning Scheme controls a section 337 certificate reports for a title.
Across its 0.77 km², Rosny is highly constrained by planning overlays. About 9% of the suburb sits within a mapped flood overlay, and 34% is flagged bushfire-prone. The dominant land-use zone is General Residential. The median lot measures about 715 m² across 399 parcels.
Who lives in Rosny
Census 2021 figures published by the ABS for the Rosny 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 1078, and decile 10 within Tasmania. The national average is 1000.
Age profile
Share of Rosny's 842 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Bellerive - Rosny, the wider ABS statistical area containing Rosny. There is no annual population series published at suburb level, so this describes the surrounding area rather than Rosny itself.
6,050 in 2001 to 6,561 in 2025, up 8%.
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.
Rosny 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 Rosny 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.
Aircraft have been seen below 3,000 ft over about 79% of Rosny. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Published flood models are held here: a Flood Model Report is available for about 370 Rosny addresses (+$9 with the planning report).
See what's in the $9 report →Rosny planning - frequently asked
Is Rosny flood-prone?
About 9% of Rosny falls within a mapped flood overlay, against the council-wide suburb average of 17%. Modelled flood depth, velocity and flood level are held for about 370 Rosny addresses, from published flood studies; the free check on the Flood Model Report page says whether a model reaches a given address.
Is Rosny bushfire-prone?
Around 34% of Rosny is mapped as bushfire-prone, compared with a Clarence average of 66%.
Is Rosny under a flight path?
Aircraft were observed below 3,000 ft over about 79% of Rosny, and over about 92% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 26 Sep 2026). The lowest measured aircraft was at 1,000 ft, with an average of 1,500 ft. At the busiest point in the suburb about 1 aircraft a day were recorded passing over one 500 m square. 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 Rosny?
The dominant planning zone in Rosny is General Residential, though the suburb also includes Environmental Management and Open Space.
Does Rosny have heritage-listed places?
No heritage-listed places are on record within Rosny.
What is the typical lot size in Rosny?
Across 399 surveyed parcels in Rosny, the median lot size is about 715 m².
What is the population of Rosny?
At the 2021 Census Rosny had 842 usual residents, with a median age of 47 and an average household size of 2.4 people. The wider Bellerive - Rosny statistical area, which contains Rosny, went from 6,050 people in 2001 to 6,561 in 2025, up 8%.
Is Rosny an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Rosny scores 1078 and sits in decile 10 of 10 nationally and decile 10 within Tasmania (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Rosny?
Median household income in Rosny was $1,853 a week at the 2021 Census, against $1,723 for the typical suburb in Clarence. Median rent was $450 a week and the median mortgage repayment $1,733 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Montagu Bay | 0.7 km | 14% | 6% |
| Rosny Park | 1.1 km | 24% | 0% |
| Rose Bay | 1.4 km | 14% | 38% |
| Bellerive | 1.8 km | 12% | 17% |
| Queens Domain Hobart |
2.4 km | 4% | 71% |
| Glebe Hobart |
2.5 km | 3% | 12% |
| Hobart Hobart |
2.6 km | 25% | 0% |
| Battery Point Hobart |
2.9 km | 7% | 0% |
| North Hobart Hobart |
3.2 km | 12% | 0% |
| Warrane | 3.5 km | 10% | 63% |