Hewett flood map & planning overlays
A planning-constraint profile of Hewett
(Light Regional Council, SA) - 1.67 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
1.67 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Hewett'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 Hewett
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
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.
Hewett at a glance
How Hewett is zoned
Selling in Hewett? 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 1.67 km², Hewett is highly constrained by planning overlays. About 28% of the suburb sits 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 Neighbourhood. The median lot measures about 814 m² across 1,057 parcels.
Who lives in Hewett
Census 2021 figures published by the ABS for the Hewett 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 1043, and decile 9 within South Australia. The national average is 1000.
Age profile
Share of Hewett's 2,961 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of Gawler - North, the wider ABS statistical area containing Hewett. There is no annual population series published at suburb level, so this describes the surrounding area rather than Hewett itself.
6,079 in 2001 to 10,364 in 2025, up 70%.
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.
Hewett 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 Hewett 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 75% of Hewett. 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 Hewett lot.
See what's in the $9 report →Hewett planning - frequently asked
Is Hewett flood-prone?
About 28% of Hewett falls within a mapped flood overlay, against the council-wide suburb average of 4%.
Is Hewett bushfire-prone?
Around 100% of Hewett is mapped as bushfire-prone, compared with a Light Regional Council average of 100%.
Is Hewett under a flight path?
Aircraft were observed below 3,000 ft over about 75% of Hewett, in the period sampled (4 Sep 2026 to 3 Oct 2026). The lowest measured aircraft was at 500 ft, with an average of 2,000 ft. At the busiest point in the suburb about 2 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 Hewett?
The dominant planning zone in Hewett is Neighbourhood, though the suburb also includes Township Activity Centre and General Neighbourhood.
Does Hewett have heritage-listed places?
Hewett has 1 heritage-listed place on record.
What is the typical lot size in Hewett?
Across 1,057 surveyed parcels in Hewett, the median lot size is about 814 m².
Does Hewett have a train station?
There is no train station inside Hewett itself. The suburb is served by 11 bus stops.
What is the population of Hewett?
At the 2021 Census Hewett had 2,961 usual residents, with a median age of 38 and an average household size of 3.2 people. The wider Gawler - North statistical area, which contains Hewett, went from 6,079 people in 2001 to 10,364 in 2025, up 70%.
Is Hewett an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Hewett scores 1043 and sits in decile 9 of 10 nationally and decile 9 within South Australia (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in Hewett?
Median household income in Hewett was $2,439 a week at the 2021 Census, against $1,874 for the typical suburb in Light Regional Council. Median rent was $340 a week and the median mortgage repayment $1,733 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Willaston Town of Gawler |
1.2 km | 36% | 75% |
| Gawler Belt | 2.2 km | 28% | 98% |
| Gawler Town of Gawler |
2.3 km | 50% | 8% |
| Gawler East Town of Gawler |
2.9 km | 11% | 83% |
| Gawler West Town of Gawler |
3.2 km | 79% | 44% |
| Reid Town of Gawler |
3.3 km | 59% | 92% |
| Gawler South Town of Gawler |
3.5 km | 22% | 70% |
| Concordia The Barossa Council |
3.8 km | 2% | 100% |
| Evanston Town of Gawler |
4.7 km | 32% | 45% |
| Roseworthy | 4.9 km | 0% | 99% |