Underwood flood map & planning overlays

71 flights a day pass over Underwood's busiest patch of sky, 2nd in Logan City.

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A planning-constraint profile of Underwood (Logan City, QLD) - 4.2 km², mapped from live council and state overlay data. This suburb is highly constrained.
Profile updated 7 November 2026.

Planning schematicUnderwood

Constraint readout

4.2 km² - this suburb is highly constrained by planning overlays.

Flood overlay 33%

below council avg (48%) · #43 of 68 mapped council suburbs

Modelled flood depth held for about 510 addresses here

See the Logan flood map by suburb.

Bushfire-prone 9%

below council avg (54%) · #68 of 69 mapped council suburbs

Environmental14%

below council avg (69%) · #64 of 69 in council

Heritage sites 0 Noise corridor 45% Aircraft seen below 3,000 ft 100% Mostly Low Density Residential Flood 43rd most affected of 68 → Bushfire 68th most affected of 69 →

Elevation hillshade with street names, clipped to Underwood'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

How common is mapped flood risk across Underwood properties?

Counts of properties, not share of land, across 3,665 analysed Underwood properties; no individual property result is identified.

Lot-level readout

Properties analysed

3,665

lot-by-lot flood, slope and elevation

With mapped flood risk

16%

585 of 3,665 properties

Median ground slope

gently undulating, measured 50 m around each address · 4% of points 15%+

Ground level

19–67 m

AHD, across the suburb

Flood-risk rating across all 3,665 properties

No mapped risk 3,080 Low 261Medium 87High 237

From LayeredGeo's lot-risk engine: council flood overlays, historical flooding and terrain, resolved to each individual lot in Underwood.

Has Underwood flooded? Flood history and overland flow

Yes. Recorded flood mapping reaches into Underwood: 141 of the 3,665 properties we analysed (3.8%) sit at least partly inside a mapped historical flood extent (Historic Flood 2017: 128, Historic Flood 2022: 104). The free address check says whether a given lot is inside one.

Suburb-wide totals across 3,665 analysed properties; they do not identify or describe any individual property.

Recorded historical flood mapping

3.8%

141 analysed properties intersect at least one mapped historical event extent.

Historic Flood 2017: 128
Historic Flood 2022: 104

Mapped overland flow

44.9%

1,645 analysed properties carry a mapped overland-flow category.

Low: 1,645

Source: Logan City Council flood mapping, aggregated by LayeredGeo. Categories are only shown where at least five analysed properties share them. An address-level check is still required to determine whether a particular lot is mapped.

Aircraft noise and flight paths over Underwood

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 7 Nov 2026

Under observed aircraft

100%

of the suburb, at or below 10,000 ft

Below 3,000 ft

100%

of the suburb's area

Lowest measured

500 ft

averaging 4,500 ft

Busiest square

~62 a day

12 a day below 3,000 ft · ±9%
typical observed square 6 a day

Night movements: observed, lowest 1,000 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.

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.

Underwood at a glance

Parcels 3,355 Median lot 613 m² Mapped easements 431 Bus stops 19 Schools in suburb 0 Landslide overlay 13%

Schools in and near Underwood

Public school-location data shows availability across the suburb; it does not rate schools or assign any individual address to a catchment.

Inside the suburb boundary

0 schools providing primary years and 0 providing secondary years. A combined school may be counted in both teaching levels.

Nearest school availability

Primary: inside the suburb

Secondary: 0.22 km from the suburb boundary

Source: Queensland Government school geographic information. Catchment boundaries can divide a suburb and change over time; use the official catchment finder for a specific address.

How Underwood is zoned

Low Density Residential 44%

Mixed Use 23%

Recreation and Open Space 13%

Low-Medium Density Residential 6%

Specialised Centre 5%

Centre 4%

Selling in Underwood? The lot-level zone is the zoning Part 3 of Queensland's Form 2 seller disclosure statement asks for - see our Form 2 planning data guide.

Across its 4.2 km², Underwood is highly constrained by planning overlays. About 33% of the suburb sits within a mapped flood overlay, and 9% is flagged bushfire-prone. The dominant land-use zone is Low Density Residential. The terrain is gently undulating, and the median lot measures about 613 m² across 3,355 parcels.

Who lives in Underwood

Census 2021 figures published by the ABS for the Underwood suburb boundary itself, not a wider region.

Population

6,809

usual residents, 2021

Median age

years

Median household income

$1,992

per week, Logan City suburb typical $1,924

Median rent

$400

per week, Logan City suburb typical $395

Median mortgage

$1,950

per month

Household size

3.1

people, average

Socio-economic standing

ABS SEIFA 2021 ranks every Australian suburb. Decile 1 is the most disadvantaged tenth of the country, decile 10 the least.

Advantage and disadvantage (IRSAD) Decile 8

most disadvantagedleast disadvantaged

Score 1023, and decile 9 within Queensland. The national average is 1000.

Relative disadvantage (IRSD) Decile 6

most disadvantagedleast disadvantaged

Age profile

Share of Underwood's 6,809 residents in each ABS age band.

0-4 7.1%

5-14 15.8%

15-19 6.5%

20-24 6.5%

25-34 15.5%

35-44 16.6%

45-54 12.8%

55-64 9.2%

65-74 6.7%

75-84 2.8%

85+ 0.5%

Population trend, 2001 to 2025

Estimated resident population of Underwood, the wider ABS statistical area containing Underwood. There is no annual population series published at suburb level, so this describes the surrounding area rather than Underwood itself.

3,216 in 2001 to 7,527 in 2025, up 134%.

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.

Underwood property market snapshot

Queensland Government publishes this as a SA2 market series for Underwood, the wider statistical area containing Underwood. It is not a valuation and is not specific to this suburb or any individual property.

House sales

$1,217,500

Median sale price from 93 sales over 12 months to March 2026.

Unit sales

$752,000

Median sale price from 29 sales over 12 months to March 2026.

Source: Queensland Government Statistician's Office (QGSO). View the source profile. The same SA2 figure can appear on several suburb pages within that statistical area.

Underwood 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 relevant council planning scheme and Queensland Government spatial data
Bushfire-prone mapping	Mapped	the relevant council planning scheme and Queensland Government spatial data
Zoning	Mapped	the relevant council planning scheme and Queensland Government spatial data
Heritage and environment	Mapped where published	the relevant council planning scheme and Queensland Government spatial data
Aircraft noise contours (ANEF)	Not held	the relevant council planning scheme and Queensland Government spatial data, Defence
Observed flight paths	Observed	adsb.lol, under the Open Database License
Demographics	Available	Australian Bureau of Statistics (2021 Census and SEIFA)
School availability	Available	Queensland Government
Market statistics	Available at SA2 level	Queensland Government Statistician's Office (QGSO)

Profile last materially updated 7 November 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 Underwood 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 100% of Underwood. The report's Aircraft Overflight page narrows that to the address itself: how many aircraft a day, how low, and at what heights.

Published flood models are held here: a Flood Model Report is available for about 510 Underwood addresses (+$9 with the planning report).

The Terrain Report shows the fall of the block - contours, cross sections and a 3D model of the lot to spin round in your browser (+$9 with the planning report).

Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and the indicative soil reactivity range to expect for a Underwood lot.

Underwood planning - frequently asked

Is Underwood flood-prone?

About 33% of Underwood falls within a mapped flood overlay, against the council-wide suburb average of 48%. Across the suburb, 16% of the 3,665 properties we analysed carry some level of mapped flood risk, including 237 rated high risk or historically affected. Modelled flood depth, velocity and flood level are held for about 510 Underwood addresses, from published flood studies; the free check on the Flood Model Report page says whether a model reaches a given address.

Has Underwood flooded?

Is Underwood bushfire-prone?

Around 9% of Underwood is mapped as bushfire-prone, compared with a Logan City average of 54%.

Is Underwood under a flight path?

Aircraft were observed below 3,000 ft over about 100% of Underwood, in the period sampled (4 Sep 2026 to 7 Nov 2026). The lowest measured aircraft was at 500 ft, with an average of 4,500 ft. At the busiest point in the suburb about 62 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 Underwood?

The dominant planning zone in Underwood is Low Density Residential, though the suburb also includes Mixed Use and Recreation and Open Space.

Does Underwood have heritage-listed places?

No heritage-listed places are on record within Underwood.

Is Underwood hilly or flat?

Underwood is gently undulating: the median ground slope is about 5%, and 4% of measured points sit on grades of 15% or steeper. Ground level runs from roughly 19 m to 67 m AHD across the suburb.

What is the typical lot size in Underwood?

Across 3,355 surveyed parcels in Underwood, the median lot size is about 613 m². There are also 431 registered easements mapped in the suburb.

Does Underwood have a train station?

There is no train station inside Underwood itself. The suburb is served by 19 bus stops.

What is the population of Underwood?

At the 2021 Census Underwood had 6,809 usual residents, with a median age of 34 and an average household size of 3.1 people. The wider Underwood statistical area, which contains Underwood, went from 3,216 people in 2001 to 7,527 in 2025, up 134%.

Is Underwood an advantaged suburb?

On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Underwood scores 1023 and sits in decile 8 of 10 nationally and decile 9 within Queensland (decile 1 is the most disadvantaged tenth, decile 10 the least).

What is the median household income in Underwood?

Median household income in Underwood was $1,992 a week at the 2021 Census, against $1,924 for the typical suburb in Logan City. Median rent was $400 a week and the median mortgage repayment $1,950 a month.

Compare nearby suburbs

Nearby suburb	Distance	Flood mapped	Bushfire-prone
Kuraby Brisbane City	1.8 km	19%	49%
Rochedale South	2.0 km	22%	18%
Woodridge	2.5 km	24%	13%
Springwood	3.2 km	25%	35%
Runcorn Brisbane City	3.3 km	13%	27%
Eight Mile Plains Brisbane City	3.7 km	16%	22%
Slacks Creek	3.9 km	69%	29%
Karawatha Brisbane City	4.0 km	36%	93%
Logan Central	4.3 km	26%	13%
Rochedale Brisbane City	4.3 km	12%	65%

See all Logan City suburb profiles →