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NSW Flood Data Portal

Flood study

The Village of Collector Flood Study

Collector has a population of about 150 and is located on the western side of the Federal Highway in the catchment of Collector Creek, which drains an area of about 140 square kilometres at the village. The creek flows in a generally southerly direction from its headwaters and continues around the western and southern sides of the village before continuing southwards to discharge to Lake George. A major tributary, Willow Tree Creek, drains a large catchment to the south-east of the Federal Highway and flows in a northerly direction across the highway before turning westwards to join Collector Creek upstream of the village. Two large waterway openings in the Federal Highway are located downstream of the village on the main channel of Collector Creek and its floodplain.

The objective of the flood studies was to define flood behaviour in the villages in terms of flows, peak levels and extents for floods ranging between 20 and 200 years average recurrence interval, as well as for the Extreme Flood.

The flood study had three components:

  • Preparation of the Data Collection Report – L&A, 2012. This component involved the collection and review of available data on historic flood behaviour, as well as available survey information and provided recommendations for the collection of additional data for preparation of the catchment and floodplain models.
  • A hydrologic component which included preparation of the RORB hydrologic model of the study catchment, testing the sensitivity of model parameters for historic and design storms and adoption of model parameters for design flood estimation; derivation of design storm rainfalls and their application to the model to define design discharge hydrographs.
  • A hydraulic component which comprised the preparation and testing of the TUFLOW hydraulic model of the main streams and floodplains and the application of historic and design discharge hydrographs to the model to define indicative extents and depths of inundation, water surface profiles, flows and velocities for the design floods.

Additional Information

Field Value
Title The Village of Collector Flood Study
Publication Date 1 February 2014
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Upper Lachlan Shire Council
Author/ Prepared by Lyall & Associates
Publish date 27 May 2019
Update date 21 June 2019
Approval State Approved
Submitted for approval 28 May 2019
Submitted by Akhil Sud
Approved 21 June 2019
Approved by jhudson
Identifier d1f618c3-94b3-43b0-9885-ce2263f928a9