WMAwater has completed over 50 Flood Studies under the NSW Floodplain Management Program in both urban and rural areas across the state, and successfully progressed many of these studies through the Risk Management Study and Plan stage. We have also completed dozens of site-specific hydraulic modelling and flood impact assessments for private developers and other government clients. We are proficient with the major hydrologic and hydraulic modelling packages, including TUFLOW, SOBEK, Mike, RMA, HEC-RAS, RUBICON, RAFTS, DRAINS, WBNM, RORB, and more.

Our expertise with all stages of the Flood Study process enable us to provide pragmatic information that can lead to real solutions for flood risk management, Rather than blindly relying on “one-size-fits-all” modelling techniques, we use our experience to apply analysis methodologies that are specifically designed for the catchment at hand.

Flood Study Projects

  • Paterson River Flood Study: In April 2015 the Paterson and Williams Rivers both experienced major flooding, with devastating consequences throughout the valley. Three people were killed in flash flooding and at Dungog there was significant damage to houses, with some properties being washed off their footings. The flood appears to be the highest at the Gostwyck Bridge gauge since detailed records were established in 1928.
  • Greater Macquarie Rivulet Catchment Flood Study: WMAwater have been engaged by Shellharbour City Council to undertake a Flood Study for the Great Macquarie Rivulet catchment. As urbanisation and development continues, the ability to effectively manage flood prone lands will be dependent on an accurate assessment of existing flood conditions upon which to base future floodplain management decisions. It is therefore important that appropriate tools and information to assess flood risk are available to Shellharbour City Council for planning purposes.
  • Medowie Flood and Drainage Study: The Medowie area, located five kilometres to the north-east of Raymond Terrace in NSW, has in recent years undergone considerable residential development and potentially more may occur in the future. Rural and rural residential lots are being sub-divided for suburban lots and in some locations new development is proposed. A challenge that faces planners is that within both the Campvale and Moffats Swamp catchments which comprise Medowie, some areas are subject to inundation by flooding in relatively small flood events (1Y to 5Y ARI). A further complication is that the Campvale catchment is a drinking water supply catchment and so drainage solutions must take account of water quality impacts.
  • Wollongong Flood Study: The key objective of the Flood Study was to develop a suitable hydraulic model that can be used as the basis for a Floodplain Risk Management Plan for the study area, which will assist Wollongong City Council to undertake flood-related planning decisions for existing and future developments. Previous hydraulic modelling of the study area was limited in extent, and did not estimate flood levels or flows in residential areas of the catchment.