The Basin flood map & planning overlays
The VIC Basin is 100% significant landscape overlay, 1st in Victoria.
Free map preview, then PDF reports from $9 - about the price of an iced latte on a public holiday.
A planning-constraint profile of The Basin
(Knox, VIC) - 5.13 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 24 October 2026.
Constraint readout
5.13 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to The Basin'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 The Basin
The ANEF contour is a published planning forecast and observed overflight is what a sampled tracking feed recorded - neither describes any individual property.
Observed overflight - sampled 4 Sep to 24 Oct 2026
typical observed square 0 a day
Night movements: observed, lowest 2,500 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.
How this is measured
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.
The Basin at a glance
How The Basin is zoned
Selling in The Basin? The zoning and planning overlays on this page are the controls a Section 32 vendor statement discloses.
Across its 5.13 km², The Basin is highly constrained by planning overlays. About 1% of the suburb sits within a mapped flood overlay, and 82% is flagged bushfire-prone. There are 7 heritage-listed sites on record, and the dominant land-use zone is Rural Conservation Zone (RCZ1). The median lot measures about 1,002 m² across 1,908 parcels.
Who lives in The Basin
Census 2021 figures published by the ABS for the The Basin 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 1024, and decile 7 within Victoria. The national average is 1000.
Age profile
Share of The Basin's 4,497 residents in each ABS age band.
Population trend, 2001 to 2025
Estimated resident population of The Basin, the wider ABS statistical area containing The Basin. There is no annual population series published at suburb level, so this describes the surrounding area rather than The Basin itself.
4,533 in 2001 to 4,336 in 2025, down 4%.
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.
The Basin 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 | Vicmap Planning and Victorian Government spatial services |
| Bushfire-prone mapping | Mapped | Vicmap Planning and Victorian Government spatial services |
| Zoning | Mapped | Vicmap Planning and Victorian Government spatial services |
| Heritage and environment | Mapped where published | Vicmap Planning and Victorian Government spatial services |
| Aircraft noise contours (ANEF) | Not held | Vicmap Planning and Victorian Government spatial services, 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 24 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 The Basin 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.
See what's in the $9 report →Aircraft have been seen below 3,000 ft over about 58% of The Basin. 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 the indicative soil reactivity range to expect for a The Basin lot.
The Basin planning - frequently asked
Is The Basin flood-prone?
About 1% of The Basin falls within a mapped flood overlay, against the council-wide suburb average of 12%.
Is The Basin bushfire-prone?
Around 82% of The Basin is mapped as bushfire-prone, compared with a Knox average of 42%.
Is The Basin under a flight path?
Aircraft were observed below 3,000 ft over about 58% of The Basin, and over about 83% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 24 Oct 2026). The lowest measured aircraft was at 1,000 ft, with an average of 3,000 ft. At the busiest point in the suburb about 0 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 The Basin?
The dominant planning zone in The Basin is Rural Conservation Zone (RCZ1), though the suburb also includes Low Density Residential Zone (LDRZ) and Neighbourhood Residential Zone (NRZ1).
Does The Basin have heritage-listed places?
The Basin has 7 heritage-listed places on record.
What is the typical lot size in The Basin?
Across 1,908 surveyed parcels in The Basin, the median lot size is about 1,002 m². There are also 902 registered easements mapped in the suburb.
Does The Basin have a train station?
There is no train station inside The Basin itself. The suburb is served by 15 bus stops.
What is the population of The Basin?
At the 2021 Census The Basin had 4,497 usual residents, with a median age of 40 and an average household size of 2.7 people. The wider The Basin statistical area, which contains The Basin, went from 4,533 people in 2001 to 4,336 in 2025, down 4%.
Is The Basin an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), The Basin scores 1024 and sits in decile 8 of 10 nationally and decile 7 within Victoria (decile 1 is the most disadvantaged tenth, decile 10 the least).
What is the median household income in The Basin?
Median household income in The Basin was $2,019 a week at the 2021 Census, against $1,915 for the typical suburb in Knox. Median rent was $365 a week and the median mortgage repayment $1,950 a month.
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Ferny Creek Yarra Ranges |
2.5 km | Not mapped | 100% |
| Tremont Yarra Ranges |
2.5 km | <1% | 100% |
| Boronia | 2.6 km | 4% | 17% |
| Kilsyth South Maroondah |
3.0 km | Not mapped | 50% |
| Sassafras Yarra Ranges |
3.1 km | Not mapped | 100% |
| Mount Dandenong Yarra Ranges |
3.6 km | Not mapped | 100% |
| Kilsyth Yarra Ranges |
4.2 km | 6% | 32% |
| Olinda Yarra Ranges |
4.5 km | Not mapped | 100% |
| Bayswater North Maroondah |
4.5 km | <1% | 10% |
| Montrose Yarra Ranges |
4.7 km | 1% | 90% |