Environmental issues

Water

Wonboyn River

Physical characteristics

Entrance
location
Latitude (ºS)-37.25
Longitude (ºE)149.97
Catchment area (km2)1335.4
Estuary area (km2)1,24.2
Estuary volume (ML)39809.1
Average depth (m)42.7
Roy et al. (2001) classification5III/5/A
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:     1.15km from entrance on 15-16/10/97

Tide stateFlow
(106 m3
Local
tidal range (m)
Sydney Harbour
tidal range (m)
Ebb flow0.620.141.54
Flood flow 0.560.161.58

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
Oct 1997Extensive data collection: water levels at eight sites, velocities at two sites, in situ water quality at three sites, water quality profiles at nine sites, chlorophyll a samples at five sites, nutrient samples at three sites, macrobenthic and sediment samples at twenty sites.1988-59.pdfMHL893
Aug 1997 to Sept 1998Wonboyn River Water Quality Monitoring 1998-99.-MHL964

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
53499S1.pdfIndex plan & tidal planes1:8000618.7kb
53499S2.pdfWonboyn River entrance1:1000437.0kb
53499S3.pdfWonboyn River lower estuary1:1000370.5kb
53499S4.pdfWonboyn River lower estuary1:1000248.0kb
53499S5.pdfWonboyn Lake1:1000384.1kb
53499S6.pdfWonboyn Lake1:1000282.7kb
53499S7.pdfWonboyn River mid estuary1:1000369.0kb
53499S8.pdfWonboyn River mid estuary1:1000318.5kb
53499S9.pdfWonboyn River mid estuary1:1000306.8kb
53499S10.pdfWonboyn River mid estuary1:1000340.7kb
53499S11.pdfWonboyn River upper estuary1:1000315.4kb
53499S12.pdfWonboyn River upper estuary1:1000317.9kb
53499S13.pdfWonboyn River upper estuary1:1000282.4kb
53499S14.pdfWonboyn River upper estuary1:1000187.6kb
53499.txtWonboyn River xyz dataN/A856.0kb
Page last updated: 27 April 2012