|Catchment area (km2)1||238.4|
|Estuary area (km2)1,2||35.8|
|Estuary volume (ML)3||74275.1|
|Average depth (m)4||2.1|
|Roy et al. (2001) classification5||III/5/B|
- Derived from DECCW (2010) NSW estuaries and coastal catchments spatial database.
- Includes area mapped as open water (see note 1), mangrove and saltmarsh areas (Creese R. G., Glasby T. M., West G. and Gallen C. (2009) Mapping the habitats of NSW estuaries. Industry & Investment NSW Fisheries Final Report Series 113. Port Stephens, NSW, Australia.
- Based on areas at 0.6 m AHD (Roper T., Creese B., Scanes P., Stephens K., Williams R., Dela-Cruz J., Coade G. and Coates B. (2011) Assessing the condition of estuaries and coastal lake ecosystems in NSW. Office of Environment and Heritage, Sydney).
- Estimated by dividing the total volume at 0.6 m AHD by the total surface area of the estuary including mangrove areas but excluding saltmarsh (Roper et al., 2011)
- Estuary group: I = oceanic embayment, II = tide dominated estuary, III = wave dominated estuary, IV = intermittently closed estuary V = freshwater bodies
Estuary type: 1 = ocean embayments, 3 = drowned valley estuary, 5 = barrier estuary, 6 = barrier lagoon, 7 = interbarrier estuary, 8 = saline coastal lagoon, 9 = small coastal creeks, 11 = brackish barrier lake. Evolution stage: A=youthful, B=intermediate, C=semi-mature, D=mature.
(P. S. Roy, R. J. Williams, A. R. Jones, I. Yassini, P. J. Gibbs, B. Coates, R. J. West, P. R. Scanes, J. P. Hudson and S. Nichol (2001) Structure and Function of South-east Australian Estuaries. Estuarine, Coastal and Shelf Science 53, 351-384)
- Entrance conditions: O = open, T = trained, I = intermittent.
The volume of water moving
past a fixed cross section during each flood tide or ebb tide (i.e.
slack water to slack water), is referred to as the tidal prism of an
The following table shows
the measured tidal prism at the location specified, along with the
tidal range for near the measurement site and at Sydney Harbour.
Location: 1.3km from the entrance on 10/3/08
tidal range (m)
tidal range (m)
|Flood flow ||2.7||0.63||1.32|
Tidal surveys measure the hydrodynamic behaviour of an estuary during a full tidal cycle. The parameters measured include velocity, water levels, salinity, temperature and pH.
The following tidal surveys have been undertaken on this estuary. A map shows the location and plots of the flows and water levels for the most comprehensive survey.
Copies of tidal survey reports are available from the Estuary Management Program.
|Jan 1974||Current metering at Windang Bridge and six tideboards - full cycle but continual ebb due to high lake level.||-||MHL366|
|May 1974||Current metering at Windang Bridge - same as 14-15/1 but lake level lower (full ebb and flood).||-||MHL366|
|Feb 1994||Current metering over a neap tide at the entrance using ADCP, water samples collected at the metering line.||-||AWACS 94/10|
|Mar 1994||Current metering over a spring tide at the entrance using ADCP, water samples collected at the metering line.||-||AWACS 94/10|
|Feb 2008 to Feb 2009||Extensive data collection: water levels at eleven sites; velocities at one site; and water quality profiles at twelve sites.||1988-40.pdf||MHL1826|
The hydrographic survey provides the depth and physical characteristics of the estuary.
The metadata associated with the survey can be found on the map sheets provided.
|Map sheet number ||Description||Scale ||Size|
|53525SH1.pdf||Lake Illawarra entrance||1:1000||340.5kb |
|53525SH2.pdf||Lake Illawarra entrance||1:1000||327.6kb |
|53525.txt||Lake Illawarra entrance xyz data||N/A||43.0kb |
|56207s01.pdf||Index plan, legends, notes, tidal planes & datum diagram||1:15000||584.7kb |
|56207s02.pdf||Lake Illawarra & Griffins Bay||1:5000||723.5kb |
|56207s03.pdf||Lake Illawarra, Tuggerah Bay & Koonawarra Bay Cross section locations - Mullet Creek, Hooka Creek & Brooks Creek ||1:5000||732.8kb |
|56207s04.pdf||Lake Illawarra, Koonawarra Bay & Yallah Bay Cross section locations - Duck Creek ||1:5000||609.3kb |
|56207s05.pdf||Lake Illawarra, Haywards Bay & Koona Bay Cross section locations - Macquarie Rivulet, Albion Creek & Horsley Inlet||1:5000||633.2kb |
|56207s06.pdf||Lake Illawarra & entrance channel||1:5000||734.0kb |
|56207s07.pdf||Lake Illawarra entrance channel (Bevans Island)||1:2000||444.7kb |
|56207s08.pdf||Lake Illawarra entrance||1:2000||558.7kb |
|56207s09.pdf||Lake Illawarra & Whyjuck Bay||1:2000||269.0kb |
|56207s10.pdf||Cross sections - Macquarie Rivulet||1:1000 H 1:200 V||349.6kb |
|56207s11.pdf||Cross sections - Horsley Inlet & unnamed creek||1:1000 H 1:200 V||237.9kb |
|56207s12.pdf||Cross sections - Hooka Creek, Brooks Creek & Albion Creek||1:1000 H 1:200 V||290.4kb |
|56207s13.pdf||Cross sections - Mullet Creek||1:1000 H 1:200 V||333.0kb |
|56207s14.pdf||Cross sections - Mullet Creek||1:1000 H 1:200 V||306.7kb |
|56207s15.pdf||Cross sections - Duck Creek & unnamed creeks||1:1000 H 1:200 V||315.6kb |
|56207.txt||Lake Illawarra xyz data||N/A||632.4kb |
Page last updated: 26 April 2012