Gemmells flood map & planning overlays
A planning-constraint profile of Gemmells
(Alexandrina Council, SA) - 12.06 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
12.06 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Gemmells'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 Gemmells
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 3 Oct 2026
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.
Gemmells at a glance
How Gemmells is zoned
Selling in Gemmells? The zone and overlays on this page are the Planning and Design Code controls a Form 1 vendor's statement has to disclose.
Across its 12.06 km², Gemmells is highly constrained by planning overlays. Flood mapping covers the suburb and none of it falls within a mapped flood overlay, and 100% is flagged bushfire-prone. The dominant land-use zone is Rural. The median lot measures about 188,336 m² across 54 parcels.
Who lives in Gemmells
Census 2021 figures published by the ABS for the Gemmells 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 1054, and decile 10 within South Australia. The national average is 1000.
Age profile
Share of Gemmells's 99 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Strathalbyn, the wider ABS statistical area containing Gemmells. There is no annual population series published at suburb level, so this describes the surrounding area rather than Gemmells itself.
4,842 in 2001 to 8,670 in 2025, up 79%.
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.
Gemmells 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 South Australian Planning and Design Code and Location SA spatial data |
| Bushfire-prone mapping | Mapped | the South Australian Planning and Design Code and Location SA spatial data |
| Zoning | Mapped | the South Australian Planning and Design Code and Location SA spatial data |
| Heritage and environment | Mapped where published | the South Australian Planning and Design Code and Location SA spatial data |
| Aircraft noise contours (ANEF) | Not held | the South Australian Planning and Design Code and Location SA spatial data, 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 Gemmells 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 8% of Gemmells. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Gemmells lot.
See what's in the $9 report →Gemmells planning - frequently asked
Is Gemmells flood-prone?
Flood mapping covers Gemmells and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 16%).
Is Gemmells bushfire-prone?
Around 100% of Gemmells is mapped as bushfire-prone, compared with a Alexandrina Council average of 100%.
Is Gemmells under a flight path?
Aircraft were observed below 3,000 ft over about 8% of Gemmells, and over about 38% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 3 Oct 2026). The lowest measured aircraft was at 2,000 ft, with an average of 5,500 ft. 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 Gemmells?
The dominant planning zone in Gemmells is Rural, though the suburb also includes Rural Living and Productive Rural Landscape.
Does Gemmells have heritage-listed places?
No heritage-listed places are on record within Gemmells.
What is the typical lot size in Gemmells?
Across 54 surveyed parcels in Gemmells, the median lot size is about 188,336 m².
What is the population of Gemmells?
At the 2021 Census Gemmells had 99 usual residents, with a median age of 39 and an average household size of 3.0 people. The wider Strathalbyn statistical area, which contains Gemmells, went from 4,842 people in 2001 to 8,670 in 2025, up 79%.
Is Gemmells an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Gemmells scores 1054 and sits in decile 9 of 10 nationally and decile 10 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Gemmells?
Median household income in Gemmells was $2,333 a week at the 2021 Census, against $1,655 for the typical suburb in Alexandrina Council. Median rent was $638 a week and the median mortgage repayment $2,100 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Highland Valley | 3.6 km | 0% | 100% |
| Macclesfield Mount Barker District Council |
4.7 km | 0% | 100% |
| Bugle Ranges Mount Barker District Council |
4.7 km | 0% | 100% |
| Wistow Mount Barker District Council |
6.5 km | <1% | 100% |
| Woodchester | 7.3 km | 0% | 100% |
| Red Creek | 8.3 km | 0% | 100% |
| Flaxley Mount Barker District Council |
8.4 km | 0% | 100% |
| Strathalbyn | 8.5 km | 0% | 99% |
| Green Hills Range Mount Barker District Council |
8.9 km | 0% | 100% |
| Paris Creek | 9.8 km | 0% | 100% |