|Catchment area (km2)1||152.5|
|Estuary area (km2)1,2||28.3|
|Estuary volume (ML)3||84198.7|
|Average depth (m)4||3.1|
|Roy et al. (2001) classification5||III/5/A|
- 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: the entrance on 3/5/89
tidal range (m)
tidal range (m)
|Flood flow ||21.3||1.42||1.49|
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.
|Feb 1985||St Huberts Island current metering over an ebb cycle at four lines, tideboards at three locations, temperature/salinity, dissolved oxygen readings, bed and suspended sediments.||-||MHL444|
|May 1989||Current metering at three lines with temp/salinity and drogue tracking.||-||MHL568|
|Feb to Apr 2004||Extensive data collection: water levels at eleven sites; velocities at nine sites; and water quality profiles at thirty-six sites.||1988-32.pdf||MHL1319|
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.
Page last updated: 26 April 2012