|Catchment area (km2)1||21624.1|
|Estuary area (km2)1,2||114.5|
|Estuary volume (ML)3||1541412.0|
|Average depth (m)4||13.8|
|Roy et al. (2001) classification5||II/3/C|
- 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: between Barrenjoey Head and Box Head on 6/4/93
tidal range (m)
tidal range (m)
|Flood flow ||199||1.66||1.63|
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 1966||The effect of speed boat activities on bank erosion.||-||MHL106|
|May 1975||Current metering between Long Island and Spectacle Island over a half tide cycle, five tideboards.||-||MHL339|
|Apr 1976||Current metering between Long Island and Spectacle Island over a half tide cycle, five tideboards.||-||MHL339|
|Sep 1976||Current metering between Long and Spectacle Islands and at The Gut, over a half tide cycle, five tideboards.||-||MHL339|
|Sep 1976||Current metering between Long Island and Spectacle Island and at The Gut over a half tide cycle, five tideboards.||-||MHL339|
|Feb 1981||Current metering at three lines at Lower Portland. Two in the Hawkesbury River and one in the Colo.||-||MHL450|
|Apr 1981||Current metering on four lines at Windsor (Liverpool, Clarence, Wilberforce and Windsor Reaches), temp/salinity, suspended sediments and a tideboard at Lower Portland.||-||MHL369|
|May 1981||Current metering on three lines at Wisemans Ferry (Trollope Reach, Bathurst Reach and McDonald River), temp/salinity, suspended sediments and a tideboard at Lower Portland.||-||MHL369|
|Jun 1981||Current metering at three lines at Spencer (Big Jims Point, Caurangra Point and Mangrove Creek), temp/salinity, suspended sediments and a tideboard at Lower Portland.||-||MHL369|
|Aug 1981||Current metering at three lines at Mooney Mooney. One line at Peat Island, one at Peat Island bridge and one at Mooney Mooney Creek., plus temp/salinity and suspended sediments.||-||MHL369|
|Oct 1982||Current metering at Broken Bay (Commodore Heights), two tideboards (one at the entrance and one at Wisemans Ferry), velocities and temp/salinity.||-||MHL358|
|Nov 1982||Current metering on three lines at Lower Portland, one on the Colo and one upstream, one downstream of Lower Portland.||-||MHL450|
|Oct 1984||Tideboard readings taken at six tideboards including: Colo, Richmond, Central McDonald and Lower Mangrove for tidal plane analysis.||-||PWD85044|
|Apr 1986||Current metering at nine lines upstream from Windsor Bridge to Grose/Nepean confluence. Velocities at nine lines; temp/salinity, dissolved oxygen and turbidity at seven lines; tideboards on five lines.||-||MHL459|
|Apr 1987||Current metering at Milson Island at one line, echo-sounding at four lines, one tideboard and core samples.||-||MHL497|
|Jun to Dec 1990||Long term deployment of S4 current meters at nine sites between Richmond and Wisemans Ferry.||-||MHL594|
|Apr 1993||ADCP velocity and discharge measurements at four lines: Middle Head to West Head; West Head to Barrenjoey; Barrenjoey to Box Head; and Box Head to Middle Head (Brisbane Water). Data not formally reduced but discharge curves plotted.||-||-|
|Jun 1995||Extensive data collection in Berowra Creek: water levels at four sites, velocities at four sites, in situ water quality at three sites, water quality profiles at seventeen sites.||-||MHL745|
|Nov 1997 to Feb 1998||Berowra Creek Water Quality 1997-98.||-||MHL917|
|Aug to Nov 2001||Berowra Creek Chlorophyl Trial 2001-02.||-||MHL1162|
|Oct 2001||Extensive data collection in vicinity of Brooklyn, including Mullet Creek, Mooney Mooney Creek and Sandbrook Inlet: water levels at nine sites, velocities at four sites, in situ water quality at two sites and water quality profiles at twenty-one sites.||-||MHL1158|
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