Biggs Flat flood map & planning overlays
A planning-constraint profile of Biggs Flat
(Mount Barker District Council, SA) - 4.8 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
4.8 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Biggs Flat'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 Biggs Flat
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: observed, lowest 5,000 ft - night is sampled as often as day, but night traffic is light, so this is a floor and no rate can be put on it.
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.
Biggs Flat at a glance
How Biggs Flat is zoned
Selling in Biggs Flat? 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 4.8 km², Biggs Flat 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. There is 1 heritage-listed site on record, and the dominant land-use zone is Productive Rural Landscape. The median lot measures about 40,501 m² across 43 parcels.
Who lives in Biggs Flat
Census 2021 figures published by the ABS for the Biggs Flat 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 1121, and decile 10 within South Australia. The national average is 1000.
Age profile
Share of Biggs Flat's 84 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Hahndorf - Echunga, the wider ABS statistical area containing Biggs Flat. There is no annual population series published at suburb level, so this describes the surrounding area rather than Biggs Flat itself.
4,080 in 2001 to 4,698 in 2025, up 15%.
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.
Biggs Flat 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 Biggs Flat 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 24% of Biggs Flat. 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 Biggs Flat lot.
See what's in the $9 report →Biggs Flat planning - frequently asked
Is Biggs Flat flood-prone?
Flood mapping covers Biggs Flat and none of the suburb falls within a mapped flood overlay (the council-wide suburb average is 0%).
Is Biggs Flat bushfire-prone?
Around 100% of Biggs Flat is mapped as bushfire-prone, compared with a Mount Barker District Council average of 100%.
Is Biggs Flat under a flight path?
Aircraft were observed below 3,000 ft over about 24% of Biggs Flat, and over about 45% 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 500 ft, with an average of 4,500 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 Biggs Flat?
The dominant planning zone in Biggs Flat is Productive Rural Landscape.
Does Biggs Flat have heritage-listed places?
Biggs Flat has 1 heritage-listed place on record.
What is the typical lot size in Biggs Flat?
Across 43 surveyed parcels in Biggs Flat, the median lot size is about 40,501 m².
What is the population of Biggs Flat?
At the 2021 Census Biggs Flat had 84 usual residents, with a median age of 43 and an average household size of 2.7 people. The wider Hahndorf - Echunga statistical area, which contains Biggs Flat, went from 4,080 people in 2001 to 4,698 in 2025, up 15%.
Is Biggs Flat an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Biggs Flat scores 1121 and sits in decile 10 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 Biggs Flat?
Median household income in Biggs Flat was $1,625 a week at the 2021 Census, against $1,812 for the typical suburb in Mount Barker District Council. Median rent was $350 a week and the median mortgage repayment $2,980 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Chapel Hill | 2.1 km | 0% | 100% |
| Echunga | 3.3 km | <1% | 100% |
| Mylor Adelaide Hills Council |
3.5 km | 5% | 100% |
| Paechtown | 3.8 km | 0% | 100% |
| Hahndorf | 4.9 km | 3% | 100% |
| Jupiter Creek | 5.2 km | 0% | 100% |
| Bradbury Adelaide Hills Council |
5.9 km | 0% | 100% |
| Totness | 6.2 km | 0% | 100% |
| Bridgewater Adelaide Hills Council |
6.4 km | 4% | 100% |
| Longwood Adelaide Hills Council |
6.5 km | 0% | 100% |