Glenworth Valley flood map & planning overlays
A planning-constraint profile of Glenworth Valley
(Central Coast, NSW) - 22.86 km², mapped from live council and
state overlay data. This suburb is highly constrained.
Profile updated 26 September 2026.
Suburb-wide figures; the free map shows which overlays touch your lot.
Constraint readout
22.86 km² - this suburb is highly constrained by planning overlays.
Elevation hillshade with street names, clipped to Glenworth Valley'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 Glenworth Valley
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 26 Sep 2026
typical observed square 2 a day
Night movements: observed, lowest 4,000 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.
Glenworth Valley at a glance
How Glenworth Valley is zoned
Buying in Glenworth Valley? The zoning, flood and bushfire lines on the section 10.7 certificate attached to the contract are mapped controls - see our s10.7 certificate guide.
Across its 22.86 km², Glenworth Valley is highly constrained by planning overlays. About 12% of the suburb sits within a mapped flood overlay, and 94% is flagged bushfire-prone. There are 5 heritage-listed sites on record, and the dominant land-use zone is Environmental Conservation. The median lot measures about 162,389 m² across 55 parcels.
Who lives in Glenworth Valley
Census 2021 figures published by the ABS for the Glenworth Valley 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 991, and decile 5 within New South Wales. The national average is 1000.
Population trend, 2001 to 2025
Estimated resident population of Calga - Kulnura, the wider ABS statistical area containing Glenworth Valley. There is no annual population series published at suburb level, so this describes the surrounding area rather than Glenworth Valley itself.
4,793 in 2001 to 4,678 in 2025, down 2%.
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.
Glenworth Valley 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 | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Bushfire-prone mapping | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Zoning | Mapped | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Heritage and environment | Mapped where published | NSW Government spatial services, NSW ePlanning and published council flood studies |
| Aircraft noise contours (ANEF) | Not held | NSW Government spatial services, NSW ePlanning and published council flood studies, 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 26 September 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 Glenworth Valley 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 47% of Glenworth Valley. 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 over parts of Glenworth Valley. The free check tells you whether one reaches an address; where it does, a Flood Model Report is +$9 with the planning report.
Building or pricing a slab? The $119 geotechnical desktop report covers geology, soils, bores and an indicative AS 2870 site class for a Glenworth Valley lot.
See what's in the $9 report →Glenworth Valley planning - frequently asked
Is Glenworth Valley flood-prone?
About 12% of Glenworth Valley falls within a mapped flood overlay, against the council-wide suburb average of 30%. Published flood models are held over parts of Glenworth Valley; the free check on the Flood Model Report page says whether one reaches a given address.
Is Glenworth Valley bushfire-prone?
Around 94% of Glenworth Valley is mapped as bushfire-prone, compared with a Central Coast average of 69%.
Is Glenworth Valley under a flight path?
Aircraft were observed below 3,000 ft over about 47% of Glenworth Valley, and over about 69% at any altitude up to 10,000 ft, in the period sampled (4 Sep 2026 to 26 Sep 2026). The lowest measured aircraft was at 500 ft, with an average of 3,500 ft. At the busiest point in the suburb about 12 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 Glenworth Valley?
The dominant planning zone in Glenworth Valley is Environmental Conservation, though the suburb also includes National Parks and Nature Reserves and Rural Landscape.
Does Glenworth Valley have heritage-listed places?
Glenworth Valley has 5 heritage-listed places on record.
What is the typical lot size in Glenworth Valley?
Across 55 surveyed parcels in Glenworth Valley, the median lot size is about 162,389 m².
Is Glenworth Valley an advantaged suburb?
On the ABS SEIFA 2021 index of relative socio-economic advantage and disadvantage (IRSAD), Glenworth Valley scores 991 and sits in decile 6 of 10 nationally and decile 5 within New South Wales (decile 1 is the most disadvantaged tenth, decile 10 the least).
Compare nearby suburbs
| Nearby suburb | Distance | Flood mapped | Bushfire-prone |
|---|---|---|---|
| Greengrove | 3.7 km | 13% | 96% |
| Calga | 3.9 km | <1% | 96% |
| Lower Mangrove | 4.3 km | 16% | 93% |
| Mount White | 5.1 km | 5% | 95% |
| Wendoree Park | 5.6 km | 28% | 80% |
| Spencer | 6.1 km | 19% | 87% |
| Marlow | 6.6 km | 46% | 83% |
| Mooney Mooney Creek | 7.5 km | 20% | 93% |
| Mangrove Creek | 7.6 km | <1% | 100% |
| Peats Ridge | 8.5 km | Not mapped | 80% |