For the running count of what this adds up to, study by study and layer by layer, and for what is not on the map yet, build progress and the market audit carries the figures, counted on the date it shows.
Newcastle (Throsby, Styx and Cottage Creek catchments)
Flood data: Throsby, Styx and Cottage Creek Flood Study © City of Newcastle, CC BY 4.0, modified
Study: Throsby, Styx and Cottage Creek Flood Study (2023). Published December 2023 on the NSW Flood Data Portal; final study results.
Source: City of Newcastle (study by Rhelm Pty Ltd),
dataset Modifications: Extent and flood planning area shapefiles processed: small fragments removed, outlines smoothed and simplified, reprojected to EPSG:4326, re-symbolised for display. 1 m flood level contours derived from the study's 1% AEP peak water surface grid (4 m resampling, depths under 0.1 m masked out, lines simplified). Peak depth and peak velocity from the study's own 1% AEP grids, read at 4 m by block maximum rather than mean so a deep or fast cell is never averaged away. Depth banded at 0.1 and 0.15 m with anything shallower discarded; velocity banded at 0.5, 1.0 and 2.0 m/s with anything slower not drawn. A block is drawn only where most of it carries water, so the maximum sets the value and not the footprint. AR&R 2019 hazard classes from the study's hazard products: the 1% AEP in 2050 and the PMF from its Flood Hazard shapefiles, and the 1% AEP from its post-processed hazard grid, which is the only form the study publishes that event in. That grid is 18,802 by 16,583 cells at half a metre and was read as a stream and reduced to 4 m by class mode without ever being written to disk. The grids carry no projection sidecar; every shapefile in the same delivery is GDA2020 MGA Zone 56 and that is what has been used.
City of Newcastle (study by Rhelm Pty Ltd) does not endorse LEVEE or this platform.
Wollongong (Fairy & Cabbage Tree Creeks)
Flood data © Wollongong City Council, CC BY 4.0, modified
Study: Fairy and Cabbage Tree Creeks Floodplain Risk Management Study and Plan (2024). Final, August 2024, per the NSW Flood Data Portal.
Source: Wollongong City Council,
dataset Modifications: Design event extents taken from the study's own filtered extent shapefiles, one per event, dissolved. PMF extent dissolved from Flood Risk Precincts; FPA dissolved from the study FPA layers. Smoothed, simplified, reprojected to EPSG:4326, re-symbolised. Hydraulic categories polygonised per class from the study's flood function grids; the numeric codes are mapped using the study's own data dictionary, which states 3 is floodway, 2 flood storage and 1 flood fringe. Correction, 21 August 2026: the layer previously shown as the 1% AEP was the study's defined flood event delineation, which is the 1% AEP with sea level rise to 2100 and reaches 73.5 ha of ground the 1% AEP does not. It is now published under its own name and the 1% AEP shows the study's 1% AEP. Flood planning levels added 21 August 2026 from the study's own defined flood event planning level grid: reduced from 1.5 m to 6 m by taking the highest value in each block, enclosed gaps up to two cells filled so building footprints do not break a contour, contoured at 1 metre and simplified. These are planning levels, not flood levels: the study's freeboard is already in the number, so it is not added again. The grid runs from 3.5 to 352 metres AHD because the study maps overland flow up the escarpment as well as the coastal plain, and its footprint matches the study's own flood planning area to within half a per cent.
Wollongong City Council does not endorse LEVEE or this platform.
Wollongong (Whartons, Collins, Farrahars & Bellambi)
Flood data © Wollongong City Council, CC BY 4.0, modified
Study: Combined Catchments of Whartons, Collins & Farrahars Creeks, Bellambi Gully and Bellambi Lake FRMS&P (2025). Adopted 15 September 2025.
Source: Wollongong City Council,
dataset Modifications: 1% AEP and PMF extents from the study's flood function (hydraulic category) polygons. Smoothed, simplified, reprojected to EPSG:4326, re-symbolised. The study publishes no vector FPA. AR&R 2019 hazard classes added 21 August 2026 from the study's own 1 m hazard reclassification grids in its Hydraulic Model Outputs package, reduced to 4 m by class mode, polygonised per class, fragments under 320 m² dropped and outlines simplified at one grid cell with no smoothing. Corrected 21 August 2026: the class mode was not counting the dry cells, so a single classified cell in a block of sixteen carried the block and each layer was drawn about a tenth larger than the model made it. Rebuilt with the dry cells counted; both layers gave ground back and now sit over 98 per cent inside their own published extent. Flood level contours added the same day from the study's own 1 m peak water surface contours in that package: reprojected, segments under 20 m dropped, simplified 2 m, elevation rounded to an integer metre AHD.
Wollongong City Council does not endorse LEVEE or this platform.
Wollongong (Towradgi Creek)
Flood data © Wollongong City Council, CC BY 4.0, modified
Study: Towradgi Creek Flood Study, Floodplain Risk Management Study and Plan (2023). Adopted 26 June 2023.
Source: Wollongong City Council,
dataset Modifications: True 1% AEP and PMF envelope extents; FPA per the adopted FRMS&P (its planning event includes climate-change allowances). Source CRS confirmed as EPSG:28356: the archive carries 122 projection sidecars and every one of them is GDA94 MGA Zone 56, which settles what an earlier pass had to infer. Smoothed, simplified, reprojected to EPSG:4326, re-symbolised. Peak depth, peak velocity and AR&R 2019 hazard classes added 21 August 2026 from the study's own 1 m 1% AEP grids, read at 4 m: depth and velocity by block maximum so a deep or fast cell is never averaged away, hazard by class mode, and a block drawn only where most of it carries water. Depth banded at 0.1 and 0.15 m, velocity at 0.5, 1.0 and 2.0 m/s. Peak velocity in the catchment is 15.92 m/s. Flood level contours for eight events added 21 August 2026 from the study's own published 1 metre peak flood contour shapefiles, which are model output and not derived here. Those files ship without a projection sidecar and carry the level in a column named temp_h1: the name reads like a placeholder, so the reading was checked against the geometry rather than assumed, and the centroid of each value runs from 1 metre at the coast to 70 metres at the foot of the escarpment in order, without an inversion. About half the rows in each file are lines holding a single point, which is not a line; those are dropped and counted. The remainder are simplified 2 metres, dissolved to one feature per level, and levels totalling under 50 metres of line are dropped, which removes the stubs above about 55 metres AHD.
Wollongong City Council does not endorse LEVEE or this platform.
Wollongong (Mullet Creek)
Flood data © Wollongong City Council, CC BY 4.0, modified
Study: Mullet Creek Floodplain Risk Management Study and Plan (2023). 2023 per the NSW Flood Data Portal.
Source: Wollongong City Council,
dataset Modifications: Extents for ten design events derived from the study's own existing-conditions depth grids, which are published already masked at 0.1 m. FPA from the council combined FPA layer. Smoothed, simplified, reprojected to EPSG:4326, re-symbolised. Correction, 21 August 2026: the 1% AEP and PMF previously shown here were envelope unions of the existing case and the West Dapto future-development scenario, which put the 1% AEP at 1,565 ha against the study's existing-conditions 1,403 ha. They now show existing conditions. The study's West Dapto future-development scenario is also published, on its own rungs and named as such, so the 1% AEP and PMF under that scenario can be read beside the existing-conditions runs rather than replacing them. The hydraulic categories and flood planning area on this study are still the council's combined products. Peak depth, peak velocity and AR&R 2019 hazard classes added 21 August 2026 from the study's own existing-conditions 1% AEP grids, all three at 2.5 m and read at 5 m: depth and velocity by block maximum so a deep or fast cell is never averaged away, hazard by class mode. A block is drawn only where most of it carries water, so the maximum sets the value and not the footprint. Depth banded at 0.1 and 0.15 m, velocity at 0.5, 1.0 and 2.0 m/s. Peak velocity in the catchment is 10.04 m/s. Flood level contours for ten events added 21 August 2026, contoured at 1 metre from the study's own existing-conditions peak water surface grids, again at 2.5 metres read at 5. The archive holds four families of water surface grid and only one is the existing case: the EX runs are taken, and the ID8, CC-Rain, DFE and High-Rough runs are not, because a scenario run published as if it were the adopted flood level would be worse than publishing no level at all. Levels totalling under 50 metres of line are dropped, which removes the fragments in the steep upper catchment.
Wollongong City Council does not endorse LEVEE or this platform.
Wollongong (Kully Bay: Warrawong, Lake Heights, Kemblawarra)
Flood data: Kully Bay Overland Flow Study © Wollongong City Council, CC BY 4.0, modified (digitised from the published study maps)
Study: Kully Bay Overland Flow Study (2019). Study dated October 2019; the current published mapping for the Kully Bay catchment.
Source: Wollongong City Council (study by Rhelm Pty Ltd),
dataset Modifications: Digitised from the study's Volume 2 map plates (the model results are not openly licensed). Georeferenced against NSW aerial imagery at the plates' printed 1:5,000 scale, residual under about 2 m. Depth-class fills colour-extracted per plate and unioned to give each event extent; events nested so each larger event contains the smaller. Outlines simplified at about the plate cell size and Chaikin-smoothed, fragments and holes under 250 m² dropped, EPSG:4326. The plates' lowest depth class is 0-0.15 m, so the banded depth layer carries the over-0.15 m band only.
Wollongong City Council (study by Rhelm Pty Ltd) does not endorse LEVEE or this platform.
Penrith (College, Orth and Werrington Creeks)
Flood data: College, Orth and Werrington Creeks Catchment Floodplain Risk Management Study and Plan © Penrith City Council, CC BY 4.0, modified (digitised from the published study map plates)
Study: College, Orth and Werrington Creeks Catchment Floodplain Risk Management Study and Plan (2021). Floodplain Risk Management Plan final, October 2021; reports package published on the NSW Flood Data Portal in 2022.
Source: Penrith City Council (study by Catchment Simulation Solutions),
dataset Modifications: Digitised from the study's own A3 map plates, because the portal package publishes the reports rather than the result grids. Figure PDFs were extracted from a 3.27 GB archive by remote range request, rendered at 200 dpi, and georeferenced by matching each plate's greyscale aerial base against NSW imagery, with a joint fit adopted per tile so the three tiles of a figure share one transform and do not jog at the seams. Colours were classified against swatches sampled from each plate's own legend, vectorised at plate cell size, dissolved, cleaned of fragments under 64 square metres and simplified at 1.5 m. Estimated horizontal accuracy is about 10 m over the eastern and central tiles and about 30 m over the western tile, where land use has changed substantially since the plate imagery was flown. Read every boundary as indicative at property scale. Each event was digitised from its own plate, so the extents nest imperfectly: the PMF contains 93 per cent of the 1% AEP extent rather than all of it, and the shortfall is single-cell extraction noise along thin creek lines, not a finding that the 1% AEP reaches ground the PMF does not. The Flood Planning Area is not expected to contain the 1% AEP extent in this study: the council maps it lot by lot, so it extends across affected lots and excludes the road reserves that carry much of the overland flow.
Penrith City Council (study by Catchment Simulation Solutions) does not endorse LEVEE or this platform.
Wollongong (Hewitts Creek: Thirroul, Bulli, Woonona)
Flood data: Hewitts Creek Flood Study, Floodplain Risk Management Study and Plan © Wollongong City Council, CC BY 4.0, modified
Study: Hewitts Creek Flood Study, Floodplain Risk Management Study and Plan (2026). Volume 1 final report dated July 2026; post-processed results published on the NSW Flood Data Portal.
Source: Wollongong City Council (study by WMAwater),
dataset Modifications: Flood extents and hydraulic categories derived from the study's 1 m post-processed category grids: cells polygonised per class, stair-steps smoothed, parts under one grid cell removed, simplified and reprojected to EPSG:4326. Flood planning area and flood risk precinct shapefiles dissolved, smoothed and reprojected. Smoothing a 1 m grid costs the thinnest class a little area: the published flood fringe is about 10 per cent smaller than the source grid's, against under 1 per cent for the floodway, because a fringe is often only two cells wide. Read the fringe boundary as indicative at property scale. The category grids carry numeric codes and ship without a legend. The codes were resolved against the geometry rather than assumed: the class holding 72 per cent of the outer perimeter of the flood extent, fragmented into thousands of small parts with no large core, is the flood fringe; the class sitting on the creek lines is the floodway. That reading matches the same council's Redbank Creek deliverable, where the classes are named in the file names. That reading was checked against the source grid on 2026-08-21 rather than left as an inference: polygonising the 1% AEP category grid under it gives 43.5 hectares of floodway against the published layer's 44.5, and puts the floodway on the creek lines. The AR&R 2019 hazard layers and the defined flood event layers were added on 2026-08-21 from the same package's 1 m ASCII grids, reduced to 4 metres by majority class per block before polygonising, so their edges are coarser than the 1 metre layers beside them. The study also publishes water surface polygons for three events; those carry a placeholder attribute rather than a level, so they are flood extents and not flood level contours, and only the 5% AEP one adds an event the map did not already draw.
Wollongong City Council (study by WMAwater) does not endorse LEVEE or this platform.
Wollongong (LEP Flood Planning Map, May 2019)
Flood planning area: Environmental Planning Instrument (Flood), May 2019 edition, © State of New South Wales (Department of Planning, Housing and Infrastructure), CC BY 4.0, modified. Historical layer, not the current council map.
Study: Environmental Planning Instrument, Flood Planning (May 2019 edition) (2019). HISTORICAL. May 2019 edition of the statewide EPI layer. Since 14 July 2021 councils have been responsible for their own flood mapping, so this is not the current Wollongong flood planning map and must not be read as one. The statewide dataset holds 622 polygons across about ten council areas only: it is not statewide coverage, and an area's absence from it means nothing.
Source: NSW Department of Planning, Housing and Infrastructure,
dataset Modifications: Clipped to Wollongong, reprojected from GDA94 (EPSG:4283) to EPSG:4326, re-symbolised for display. Modified by Perennial.
NSW Department of Planning, Housing and Infrastructure does not endorse LEVEE or this platform.
Wollongong (Allans Creek — Port Kembla, Unanderra, Cringila, Berkeley, Figtree)
Flood data: Allans Creek Flood Study © Wollongong City Council, CC BY 4.0, modified (digitised from the published study maps)
Study: Allans Creek Flood Study (2019). Study Revision C, December 2019; the current published mapping for the catchment.
Source: Wollongong City Council (study by Advisian / Worley Group),
dataset Modifications: Digitised from the study's Volume 2 map plates (the model results are not openly licensed). Each event is printed on three overlapping 1:24,000 sheets; every sheet was georeferenced against NSW aerial imagery by normalised cross-correlation (residual 2.7-4.0 m RMS) and painted into one common MGA Zone 56 raster before vectorising, so sheet joins do not show. The plates draw a blue depth ramp over a desaturated aerial, so flood pixels were separated by their blue bias with a seed-and-grow rule rather than by differencing against a reference image. Event extents nested so each larger event contains the smaller. Outlines simplified at about the plate cell size then Chaikin-smoothed, fragments and holes under about 400 m² dropped, EPSG:4326. Extents are the design blockage scenario, the scenario the study also maps for hazard and flood function.
Wollongong City Council (study by Advisian / Worley Group) does not endorse LEVEE or this platform.
Wollongong (City centre and Gurungaty Waterway catchment)
Flood data: Wollongong City (Gurungaty Waterway) Catchment FRMS&P © Wollongong City Council, CC BY 4.0, modified (digitised from the published study figures)
Study: Wollongong City (Gurungaty Waterway) Catchment Floodplain Risk Management Study & Plan (2015). Final study and plan, November 2015.
Source: Wollongong City Council (study by WMAwater),
dataset Modifications: Read directly from the Volume 2 figure PDFs, whose flood layers are true vector polygons: no colour extraction was needed. The 1% AEP and PMF extents are the union of the study's hydraulic category polygons for that event. Categories, hazard classes and risk precincts were made mutually exclusive (the figures paint the whole extent in the lowest class and overprint the higher ones). Page-to-MGA affine fitted by matching the figures' printed cadastre against the NSW Cadastre map service, residual 0.5 m RMS. Outlines simplified 2 m, Chaikin-smoothed, fragments and holes under 200 m² dropped, EPSG:4326.
Wollongong City Council (study by WMAwater) does not endorse LEVEE or this platform.
Wollongong (Minnegang Creek — Lake Heights, Warrawong)
Flood data: Minnegang Creek Flood Study © Wollongong City Council, CC BY 4.0, modified (digitised from the published study maps)
Study: Minnegang Creek Flood Study (2019). Volume 2 maps dated August 2019; the current published mapping for the catchment.
Source: Wollongong City Council (study by Rhelm Pty Ltd),
dataset Modifications: Digitised from the study's Volume 2 map plates (the model results are not openly licensed). Georeferenced against NSW aerial imagery at the plates' printed 1:6,000 A3 scale, residual under 1 m RMS. Depth classes recovered with an alpha-blend colour model against the map book's own survey plate, which carries the identical aerial with no flood layer; building and linework overprint filled from the nearest classified pixel. Event extents are the union of the depth classes, nested so each larger event contains the smaller. Outlines simplified at about the plate cell size then Chaikin-smoothed, fragments and holes under 200 m² dropped, EPSG:4326. Design blockage scenario.
Wollongong City Council (study by Rhelm Pty Ltd) does not endorse LEVEE or this platform.
Hawkesbury (Redbank Creek, North Richmond)
Flood data © Hawkesbury City Council, CC BY 4.0, modified
Study: Redbank Creek Flood Study (2025). Model outputs 2024-2025; portal handover 2025.
Source: Hawkesbury City Council (study by Manly Hydraulics Laboratory),
dataset Modifications: Extents dissolved from the study's flood extent shapefiles (the 1% AEP and PMF sources contained duplicate polygons; the dissolved union is used). Hydraulic categories from the flood function layers, made exclusive: the council ships the floodway as its own file and a combined storage and fringe file in which the storage polygon still covers the floodway underneath it, so the floodway is taken off the storage and both are taken off the fringe, per the three exclusive categories in the department's floodplain risk management guideline FB02. The flood function files carry no projection sidecar; the flood extents in the same delivery are GDA2020 MGA Zone 56 and that is what has been used. Depth bands from the 1% AEP peak depth grid (depths under 0.1 m discarded, banded at 0.15 m). 1 m flood level contours derived from the peak water surface grid. Peak velocity from the study's own 1% AEP velocity grid, read at 4 m by block maximum so a fast channel is never averaged with its slow banks, drawn only where most of a block carries water, and banded at 0.5, 1.0 and 2.0 m/s with anything slower not drawn. Peak velocity in the catchment is 5.26 m/s. AR&R 2019 hazard classes from the study's own hazard reclassification grid, reduced to 4 m by class mode with the dry cells counted, polygonised per class, fragments under 320 m² dropped and outlines simplified at one grid cell with no smoothing. Smoothed or gridded per source type, reprojected to EPSG:4326, re-symbolised.
Hawkesbury City Council (study by Manly Hydraulics Laboratory) does not endorse LEVEE or this platform.
Hawkesbury (Hawkesbury River mainstream)
Flood data © Hawkesbury City Council, CC BY 4.0, modified
Study: Hawkesbury Floodplain Risk Management Study and Plan 2025 (Hawkesbury River) (2025). Portal handover 2025-2026; grids dated June 2025.
Source: Hawkesbury City Council (study by WMAwater),
dataset Modifications: Extents taken as the footprint of each design event's remapped peak water surface grid (2 m). Flood Planning Area from the study's supplied FPA polygon. 1 m flood level contours derived from the 1% AEP grid. Gridded outlines retained for grid-derived extents, reprojected to EPSG:4326, re-symbolised.
Hawkesbury City Council (study by WMAwater) does not endorse LEVEE or this platform.
Wollondilly (Stonequarry Creek, Picton)
Flood data © Wollondilly Shire Council, CC BY 4.0, modified (digitised from the published study report)
Study: Stonequarry Creek (Picton) Floodplain Risk Management Study and Plan (with Flood Study Update) (2020). Final report, September 2020, including the 2020 Flood Study Update.
Source: Wollondilly Shire Council (study by WMAwater),
dataset Modifications: Mapped from the council's published flood study report figures (the model data is not openly available). Georeferenced from the plates' embedded geospatial viewports, verified against road centrelines; flood classes colour-extracted per the plate legends with the fills' overprint opacity modelled; gridded outlines retained, EPSG:4326. Depth banded per the platform rules. The FPA carries the study's mainstream and overland split; parts of the overland FPA sit outside the mainstream PMF extent by design.
Wollondilly Shire Council (study by WMAwater) does not endorse LEVEE or this platform.
Sutherland (Kurnell)
Flood data © Sutherland Shire Council, CC BY 4.0, modified (digitised from the published study report)
Study: Kurnell Township Flood Study (2009). Adopted 2009; the current published mapping for the township.
Source: Sutherland Shire Council,
dataset Modifications: Digitised from the published study figures (the model data is not openly available). Georeferenced against the study's flood mapping limit and scale bar; gridded outlines retained, EPSG:4326. The study's lowest depth class starts at 0.25 m, so the banded depth layer carries the over-0.15 m band only.
Sutherland Shire Council does not endorse LEVEE or this platform.
Sutherland (Woolooware Bay)
Flood data © Sutherland Shire Council, CC BY 4.0, modified (digitised from the published study report)
Study: Woolooware Bay Floodplain Risk Management Study and Plan (2022). Adopted 2022.
Source: Sutherland Shire Council,
dataset Modifications: Digitised from the published study figures (the model data is not openly available). Georeferenced against road intersections; class fills colour-extracted with the plates' overprint opacity modelled; gridded outlines retained, EPSG:4326. Depth banded per the platform rules.
Sutherland Shire Council does not endorse LEVEE or this platform.
Sutherland (Bundeena Creek)
Flood data © Sutherland Shire Council, CC BY 4.0, modified (digitised from the published study report)
Study: Bundeena Creek Floodplain Risk Management Study and Plan 2019 (2019). Adopted 2019.
Source: Sutherland Shire Council,
dataset Modifications: Digitised from the published study figures (the model data is not openly available). Georeferenced from the report's embedded map viewport, the strongest-registered Sutherland study. Gridded outlines retained, EPSG:4326. Depth banded per the platform rules.
Sutherland Shire Council does not endorse LEVEE or this platform.
Sutherland (Oyster Creek)
Flood data © Sutherland Shire Council, CC BY 4.0, modified (digitised from the published study report)
Study: Revised Oyster Creek Flood Study (2010). Adopted 2010.
Source: Sutherland Shire Council,
dataset Modifications: Digitised from the published study figures (the model data is not openly available). Georeferenced against named roads; gridded outlines retained, EPSG:4326.
Sutherland Shire Council does not endorse LEVEE or this platform.
Hawkesbury-Nepean Valley (Bents Basin to Brooklyn, 190 km)
Flood data: Hawkesbury-Nepean River Flood Study 2024 © NSW Reconstruction Authority 2024, CC BY 4.0, modified
Study: Hawkesbury-Nepean River Flood Study, Final Report May 2024 (2024). Final study May 2024, published June 2024. The valley-wide study of record for the Hawkesbury-Nepean River from June 2024; mapping based on 2019 landform with localised updates to mid-2020.
Source: NSW Reconstruction Authority (study by Rhelm and Catchment Simulation Solutions),
dataset Modifications: Design event extents taken from the study's remapped extent layers (15 m model grid remapped to 4 m), dissolved, fragments and pinholes under 200 m² dropped, simplified at the source grid size and Chaikin-smoothed in EPSG:28356 (published areas within 1% of source), reprojected to EPSG:4326 at 5 decimal places, nesting enforced so each rarer event contains the more frequent one, re-symbolised for display.
NSW Reconstruction Authority (study by Rhelm and Catchment Simulation Solutions) does not endorse LEVEE or this platform.