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NSW Flood Data Portal

Flood study

Salt Pan Creek Flood Study

A Flood Study of Salt Pan Creek was undertaken to determine the design levels applicable to the 5 %, 2%, I% and extreme floods. The study area was limited to the major tributaries bounded by Arab Road, Canterbury Road and Moxon Road.

Design flood levels at the confluence with the Georges River were provided by the Public Works Department from the Georges River Flood Study. These levels were obtained from a design storm of 36 hour duration. However the peak flows on each of the tributaries were obtained from a 2 hour duration storm.

Design rainfall intensities and temporal patterns were obtained from Australian Rainfall and Runoff (1987) and applied to the catchment to determine the relevant design flood hydrographs for each of the tributary creeks. These were then used in the hydraulic model to derive design flood levels.

A hydrologic model was used to convert rainfall to runoff and a quasi-two-dimensional dynamic hydraulic model was used to convert runoff to flood levels. As there were no historical flood level data available the models could not be calibrated. Instead adopted parameters were based on the literature and general experience. The sensitivity of design flows to variations in the adopted parameters was investigated.

Salt Pan Creek has a catchment area of approximately 26 square kilometres to its confluence with Georges River. The Georges River in turn discharges to Botany Bay approximately 15 kilometres downstream of the Salt Pan Creek junction. Flood levels in much of the creek are strongly influenced by flood levels in the Georges River and it was necessary to consider the interaction of flooding from the Georges River and from catchment runoff.

Design flood levels were obtained from an envelope of the 36 hour duration storm in the Georges River catchment and the 2 hour duration storm within Salt Pan Creek catchment.

Design flood levels shown as a series of water surface contours together with peak velocities are shown on Figures 16 to 23. Such contours extend across the floodplain and define points which have the same flood level.

The 1%, 2%, 5% and extreme design flood profiles are shown on Figures 8 to 15.

Additional Information

Field Value
Title Salt Pan Creek Flood Study
Publication Date 1 June 1991
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Canterbury-Bankstown Council
Author/ Prepared by PWD
Publish date 5 June 2017
Update date 27 June 2017
Place Name Salt Pan Creek Catchment
Approval State Approved
Submitted for approval 6 June 2017
Submitted by John Silk
Approved 27 June 2017
Approved by dstazic
Data Comment

Report only; no other data. Legacy data; may have been superseded.

Identifier dc516772-2821-4569-9f47-6de631c40d12