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NSW Flood Data Portal

Flood study

Coffs Creek Flood Study

Coffs Creek has a catchment area of 24 square kilometres to the Pacific Ocean and is enclosed by heavily vegetated hills rising steeply to a maximum elevation of around 400 m. The upper slopes of the catchment are predominantly rural and typically utilised for banana plantations. The floodplain widens as the main north and south arms join to flow through primarily residential areas. The commercial and Central Business District (CBD) straddles the Pacific Highway (Grafton Street) and the Northern Tributaries catchment (some 7.8 square kilometres in total) joins just downstream where the channel becomes estuarine and follows a sinuous path to the ocean. The primary objectives of the study are:

  • review all existing historical rainfall data for the catchment and formulate a method of applying a rainfall distribution gradient across the catchment in lieu of the normal assumption of an even distribution of rainfall across the entire catchment in a storm event,
  • establish numerical hydrologic and hydraulic models to determine flood flows, velocities and levels for all design events,
  • estimate the approximate frequency of the November 1996 event,
  • formulate the models such that the effects of catchment development and mitigation measures on flood behaviour can be investigated.

Additional Information

Field Value
Title Coffs Creek Flood Study
Publication Date 1 May 2001
Themes Land and Resource Management
Spatial Extent
Map data © OpenStreetMap contributors
Council/LGA Coffs Harbour City Council
Author/ Prepared by WMAwater
Publish date 5 July 2019
Update date 5 July 2019
Approval State Approved
Submitted for approval 5 July 2019
Submitted by Akhil Sud
Approved 5 July 2019
Approved by dstazic
Identifier 756bcfbd-55d3-406e-bbff-7c61cf647cf8