Narrawallee Inlet

Physical characteristics

Latitude (ºS)-35.30
Longitude (ºE)150.47
Catchment area (km2)180.9
Estuary area (km2)1,21.0
Estuary volume (ML)3636.4
Average depth (m)40.7
Roy et al. (2001) classification5III/5/D
Entrance condition6O/(I)
  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:     800m upstream of the entrance on 30/9/93

Tide stateFlow
(106 m3
tidal range (m)
Sydney Harbour
tidal range (m)
Ebb flow0.320.941.1
Flood flow 0.380.931.1

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
Sep 1993Current metering at two lines, nine tideboards, two current meters deployed and water quality profiles.1988-46.pdfMHL666

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
9787SH1.pdfCross section locations1:2500043.5kb
9787SH2.pdfNarrawallee Inlet1:1000187.0kb
9787SH3.pdfCross sections - Narawallee Creek lower 1:500 H 1:100 V109.1kb
9787SH4.pdfCross sections - Narawallee Creek lower 1:500 H 1:100 V99.5kb
9787SH5.pdfCross sections - Narawallee Creek upper 1:500 H 1:100 V118.4kb
9787SH6.pdfCross sections - Narawallee Creek upper & Croobyar Creek lower section1:500 H 1:100 V149.5kb
9787SH7.pdfCross sections - Croobyar Creek upper section1:500 H 1:100 V149.6kb
9787.txtNarrawallee Inlet xyz dataN/A42.0kb
Page last updated: 27 April 2012