The Basin flood map & planning overlays

The schematic on this page is a The Basin flood map: the mapped flood overlays drawn over the suburb's terrain and street grid, covering about 1% of the suburb. Flood lines vary block to block, so for a specific property use the free interactive map - search any The Basin address and it shows the flood, zoning and bushfire mapping on the exact lot boundary.

About 1% of The Basin falls within a mapped flood overlay, against the council-wide suburb average of 12%. Flood overlays vary block to block, so whether a particular lot is affected needs a property-level check.

Around 82% of The Basin is mapped as bushfire-prone, compared with a Knox average of 43%. A bushfire-prone designation can trigger additional building requirements, so check the specific address.

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). Zoning sets what you can build and do on a site, and can differ lot by lot.

The Basin has 7 heritage-listed places on record. Heritage listing affects what you can alter or demolish, so confirm whether a specific property is listed or near a heritage place.

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 - an easement can restrict where you can build, so always check the title and overlays for the specific lot.

There is no train station inside The Basin itself. The suburb is served by 15 bus stops.

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%. ABS publishes no annual population series for individual suburbs, so that trend describes the surrounding area rather than The Basin alone.

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 being the most disadvantaged tenth of Australian suburbs and decile 10 the least. The national average score is 1000. SEIFA summarises income, education, occupation and housing across the whole suburb, so it describes the area, not any particular household in it.

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. These are 2021 Census figures and have not been indexed to today.

A The Basin planning report pulls every overlay - zoning, flood, bushfire, heritage, environmental and noise - that touches a single lot, on live council and state data. The interactive map preview is free; the full PDF report is $9.