Environmental issues

Water

Cooks River

Physical characteristics

Entrance
location
Latitude (ºS)-33.95
Longitude (ºE)151.17
Catchment area (km2)1110.6
Estuary area (km2)1,21.2
Estuary volume (ML)31084.4
Average depth (m)40.9
Roy et al. (2001) classification5II/3/C
Entrance condition6O
Notes:
  1. Derived from DECCW (2010) NSW estuaries and coastal catchments spatial database.
  2. 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.
  3. 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).
  4. 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)
  5. 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)
  6. Entrance conditions: O = open, T = trained, I = intermittent.

Tidal prism

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 estuary.

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:     Endeavour Bridge 150m from Botany Bay on 24/1/90

Tide stateFlow
(106 m3
Local
tidal range (m)
Sydney Harbour
tidal range (m)
Ebb flow2.171.181.14
Flood flow 1.570.780.77

Tidal survey

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

DateData collectedFigureReport
Apr 1981Current metering at one line, temp/salinity and four tideboards.-MHL314
Jan 1990Current metering at three lines, temp/salinity and four tideboards.1988-37.pdfMHL595
Jan to Mar 90Tidal dispersion data was collected over a variety of tidal heights on four days from January to March 1990.-MHL587

Hydrographic survey

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 DescriptionScale    Size
8710sh1.pdfCooks River (Sutton Park) & cross section locations1:500148.2kb
8710sh2.pdfCooks River (Ewen Park) & cross section locations1:500151.7kb
8710sh3.pdfCooks River (Ewen Park) & cross section locations1:500119.5kb
8710sh4.pdfCooks River (Wills Ground) & cross section locations1:500165.7kb
8710sh5.pdfCooks River (Beaman Park) & cross section locations1:500145.2kb
8710sh6.pdfCooks River (Beaman Park) & cross section locations1:500136.0kb
8710sh7.pdfCooks River (Mahony Memorial Reserve) & cross section locations1:500137.3kb
8710sh8.pdfCooks River (Illawarra Road) & cross section locations1:500137.8kb
8710sh9.pdfCooks River (Wanstead Reserve) & cross section locations1:500148.4kb
8710sh10.pdfCooks River (Gough Whitlam Park) & cross section locations1:500148.1kb
8710sh11.pdfCooks River (Bayview Avenue) & cross section locations1:500147.0kb
8710sh12.pdfWolli Creek, Cooks River & cross section locations1:500189.6kb
8710sh13.pdfWolli Creek & cross section locations1:500130.6kb
8599sh1.pdfCross sections - Cooks River1:500 H 1:100 V142.0kb
8599sh2.pdfCross sections - Cooks River1:500 H 1:100 V135.3kb
8599sh3.pdfCross sections - Cooks River1:500 H 1:100 V134.7kb
8599sh4.pdfCross sections - Cooks River1:500 H 1:100 V144.2kb
8599sh5.pdfCross sections - Cooks River1:500 H 1:100 V143.7kb
8599sh6.pdfCross sections - Cooks River1:500 H 1:100 V141.6kb
8599sh7.pdfCross sections - Cooks River1:500 H 1:100 V145.5kb
8599sh8.pdfCross sections - Cooks River1:500 H 1:100 V149.7kb
8599sh9.pdfCross sections - Cooks River1:500 H 1:100 V155.0kb
8599sh10.pdfCross sections - Wolli Creek & Cooks River1:500 H 1:100 V147.8kb
8599sh11.pdfCross sections - Wolli Creek1:500 H 1:100 V110.4kb
8710.txtCooks River xyz dataN/A54.8kb
Page last updated: 26 April 2012