Environment and Waste

Floodplain Risk Management Planning

Flood Management in Gosford CityWhat is a floodplain?

A floodplain is an area of land that has been formed by flooding over time and is still subject to periodic inundation.  Floodplains are also referred to as flood prone land.

Gosford has many types of waterways and water bodies ranging from lagoons, creeks, rivers, dams, overland flow paths, tributaries and estuaries.

These are surrounded by steep catchments that produce fast flowing water in periods of heavy rain. This stormwater is collected and contained by these waterways.

However, in periods of extensive or heavy rainfall, the waterways cannot contain all the stormwater and it therefore spills out onto the adjoining land – known as a floodplain.

Floodplains or flood prone land includes all land affected by flooding up to and including the Probable Maximum Flood (PMF) event (or the highest conceivable flood that nature can produce).

Only land that is above these levels is truly flood free.
 

What is the floodplain risk management process?

Flood Risk Management Process Diagram

For more detailed information regarding the Floodplain Risk Management Process, please refer to the NSW Floodplain Development Manual 2005.

Floodplain Risk Planning Fact Sheet
 

Current floodplain risk management studies and plans

Some reports have not been published as they contain personal/copyright information, however, they are available upon request by contacting Customer Services on (02) 4325 8222.

Locality Study Name Study Completion Date
AVOCA
   
Avoca Bowl Catchment AVOCA BOWL CATCHMENT TRUNK DRAINAGE STUDY
July 1994
Avoca Lagoon AVOCA LAGOON FLOOD STUDY
May 2008
  AVOCA LAGOON FLOODPLAIN MANAGEMENT STUDY
May 2008
  AVOCA LAGOON FLOODPLAIN MANAGEMENT PLAN
 
     
BRISBANE WATER    
Brisbane Water Foreshore BRISBANE WATER FORESHORE FLOOD STUDY
Oct 2010
  BRISBANE WATER FORESHORE FLOODPLAIN RISK MANAGEMENT STUDY
Mar 2015
  BRISBANE WATER FORESHORE FLOODPLAIN RISK MANAGEMENT PLAN
 Nov 2015
     
COPACABANA    
North Copacabana Catchment NORTH COPACABANA CATCHMENT TRUNK DRAINAGE STUDY
Aug 1994
     
​COCKRONE LAGOON
   
  COCKRONE LAGOON FLOOD STUDY
May 2008
  COCKRONE LAGAOON FLOOD STUDY - ADDENDUM ONE - MACMASTERS BEACH DRAIN
 
  COCKRONE LAGOON FLOODPLAIN MANAGEMENT STUDY
May 2008
  COCKRONE LAGOON FLOODPLAIN MANAGEMENT PLAN 
May 2008
     
DAVISTOWN    
Davistown Catchment DAVISTOWN CATCHMENT FLOOD STUDY
April 2010
  DAVISTOWN CATCHMENT FLOOD STUDY FIGURES  
     
EAST GOSFORD

  EAST GOSFORD CATCHMENT STUDY - MAIN REPORT VOLUME 1
Aug 1995
     
EMPIRE BAY    
Empire Bay Catchment EMPIRE BAY FLOOD STUDY VOL 1 - REPORT
April 2010
  EMPIRE BAY FLOOD STUDY VOL 2 - FIGURES
 
     
ERINA    
Nunns Creek NUNNS CREEK TRUNK DRAINAGE STRATEGY STUDY
Nov 1990
Erina Valley Rd Creek ERINA VALLEY RD CREEK TRUNK DRAINAGE STRATEGY STUDY
July 1991
Worthing Rd Creek TRUNK DRAINAGE STRATEGY STUDY, WORTHING RD CREEK
Feb 1991
  UPDATE OF FEBRUARY 1991 TRUNK DRAINAGE STRATEGY STUDY, WORTHING RD CREEK
Oct 2003
Erina Creek ERINA CREEK FLOOD STUDY
Aug 2013
  ERINA CREEK FLOOD STUDY - APPENDIX D - PART A
 
  ERINA CREEK FLOOD STUDY - APPENDIX D - PART B
 
  ERINA CREEK FLOODPLAIN RISK MANAGEMENT STUDY AND PLAN
Dec 2015
     
GOSFORD    
Gosford CBD GOSFORD CBD DRAINAGE INVESTIGATION
Feb 1997 
  GOSFORD CBD OVERLAND FLOW STUDY
Sept 2013
     
GREEN POINT    
Sun Valley SUN VALLEY TRUNK DRAINAGE STRATEGY - FINAL REPORT
Jan 1991
     
HAWKESBURY    
Hawkesbury River Catchment LOWER HAWKESBURY RIVER FLOOD STUDY 
1997
     
KARIONG    
Kariong Area KARIONG AREA DRAINAGE INVESTIGATION - FINAL REPORT 
Jan 2003
     
KILLCARE    
Killcare  KILLCARE CATCHMENT DRAINAGE INVESTIGATION
Aug 1999
Mudflat Creek MUDFLAT CREEK (FRASER RD KILLCARE) FLOOD STUDY
May 2007
  MUDFLAT CREEK FLOODPLAIN RISK MANAGEMENT STUDY
Aug 2008
  MUDFLAT CREEK FLOODPLAIN RISK MANAGEMENT PLAN
Aug 2008
     
KINCUMBER    
Kincumber Catchment  KINCUMBER OVERLAND FLOW STUDY
Jan 2014
     
KOOLEWONG  

  KOOLEWONG DRAINAGE STUDY
Sept 2001 
     
LISAROW / OURIMBAH BANGALOW AND CUTROCK CREEKS FLOODPLAIN MANAGEMENT STUDY
May 1997
Bangalow and Cut Rock Creeks BANGALOW AND CUTROCK CREEKS FLOODPLAIN MANAGEMENT PLAN - ADDENDUM OF DECEMBER 2014
March 1997
 Ourimbah Creek OURIMBAH CREEK CATCHMENT FLOOD STUDY -VOLUME 1 REPORT AND APPENDICES  Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 1 to 7
Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 8 to 15
Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 16 to 17
Dec 2013

OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 18 to 19
Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 20 to 22 
Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 23 to 25
Dec 2013

OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 26 to 28 
Dec 2013

OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 29 to 30
Dec 2013 
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 31 to 32
Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 33 to 34
Dec 2013

OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 35 to 37
Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 38 to 39
Dec 2013
  OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 40 to 41
Dec 2013

OURIMBAH CREEK FLOOD STUDY VOLUME 2 FIGURES 42 to 44
Dec 2013
     
NARARA    
Lower Narara Creek LOWER NARARA CREEK FLOODPLAIN MANAGEMENT PLAN
Sept 1991
  REVIEW OF LOWER NARARA CREEK FLOODPLAIN MANAGEMENT STUDY - FINAL REPORT
Dec 1993
Narara Creek Tributaries West of Hanlan Street FLOODPLAIN MANAGEMENT STUDY FOR NARARA CREEK & LOWER NARARA CREEK TRIBUTARIES WEST OF HANLAN STREET
 
  FLOODPLAIN MANAGEMENT PLAN FOR NARARA CREEK AND LOWER NARARA CREEK TRIBUTARIES WEST OF HANLAN STREET
 
Narara Creek REVIEW OF NARARA CREEK FLOOD STUDY
Oct 2013
  REVIEW OF NARARA CREEK FLOOD STUDY EXECUTIVE SUMMARY
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX A BIBLIOGRAPHY
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX B PART 1
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX B PART 2 
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX B PART 3
 
  REVIEW OF NARARA CREEK FLOOD STUDY - APPENDIX B PART 4
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX B PART 5
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX B PART 6
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX B PART 7
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX C
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX D
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX E
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX F TOPOGRAPHIC AND HYDROGRAPHIC SURVEY
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX F TOPOGRAPHIC AND HYDROGRAPHIC SURVEY PART 1
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX F TOPOGRAPHIC AND HYDROGRAPHIC SURVEY PART 2
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX F TOPOGRAPHIC AND HYDROGRAPHIC SURVEY PART 3
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX F TOPOGRAPHIC AND HYDROGRAPHIC SURVEY PART 4
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX G TABULATED MODEL OUTPUT
 
  REVIEW OF NARARA CREEK FLOOD STUDY -APPENDIX H DESIGN FLOOD MODELLING CRITICAL DURATIONS


REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 1
 
  REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 2 
 
  REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 3
 

REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 4
 
  REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 5
 
  REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 6
 

REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 7

  REVIEW OF NARARA CREEK FLOOD STUDY FIGURES PART 8 
 



NIAGARA PARK    
Upper Narara Creek UPPER NARARA CREEK FLOOD STUDY - FINAL REPORT
Dec 1993
Niagara Park Branch - Upper Narara Creek NIAGARA PARK BRANCH - UPPER NARARA CK FLOOD STUDY
Jun 1998
Upper Narara Creek UPPER NARARA CREEK FLOODPLAIN MANAGEMENT STUDY
Mar 1995
  UPPER NARARA CREEK FLOODPLAIN MANAGEMENT PLAN
Mar 1995
     
PEARL BEACH    
Middle Creek MIDDLE CREEK PEARL BEACH FLOOD STUDY
Dec 2003
  MIDDLE CREEK PEARL BEACH FLOODPLAIN RISK MANAGEMENT STUDY
Sept 2008
  MIDDLE CREEK PEARL BEACH FLOODPLAIN RISK MANAGEMENT PLAN
Sept 2008
Green Point Creek GREEN POINT CREEK PEARL BEACH FLOODPLAIN MANAGEMENT STUDY
Nov 1992
  GREEN POINT CREEK PEARL BEACH FLOODPLAIN MANAGEMENT PLAN
Nov 1992
Pearl Beach PEARL BEACH FLOODING & DRAINAGE INVESTIGATION
Sept 1992
     
POINT CLARE

  POINT CLARE TRUNK DRAINAGE STUDY - MANAGEMENT STUDY AND MANAGEMENT PLAN
May 1994

     
PRETTY BEACH    
Pretty Beach PRETTY BEACH DRAINAGE STUDY - FINAL REPORT
Dec 2003
Turo Creek TURO CREEK PRETTY BEACH FLOOD STUDY
 Dec 2003
  TURO CREEK PRETTY BEACH FLOODPLAIN RISK MANAGEMENT STUDY
Aug 2007
  TURO CREEK PRETTY BEACH FLOODPLAIN RISK MANAGEMENT PLAN
Aug 2007
     
SOMERSBY    
Piles Creek SOMERSBY DRAINAGE STUDY
Feb 1996
  SOMERSBY DRAINAGE STUDY - 100 YEAR FLOOD EXTENT PLANS
 
  SOMERSBY DRAINAGE STUDY PLANS - PILES CREEK CROSS SECTIONS
 

SOMERSBY DRAINAGE STUDY - TRIBUTARY CROSS SECTIONS
 
  SOMERSBY DRAINAGE STUDY - COMPOSITE PLAN
 
  SOMERSBY DRAINAGE STUDY PLANS

 

TASCOTT    
Tascott Basin TASCOTT BASIN FLOODPLAIN MANAGEMENT STUDY
Feb 1990 / Sept 1992
     
TERRIGAL    
Terrigal Valley TERRIGAL VALLEY TRUNK DRAINAGE STRATEGY - FINAL REPORT
Jan 1991
Terrigal CBD, Grasslands Avenue and Riviera Catchment TRUNK DRAINAGE MANAGEMENT STUDY & PLAN
Aug 1995
Terrigal Lagoon TERRIGAL LAGOON FLOOD STUDY
Nov 2001
  TERRIGAL LAGOON FLOODPLAIN MANAGEMENT STUDY
Nov 2001
  TERRIGAL LAGOON FLOODPLAIN MANAGEMENT PLAN
Nov 2001
Terrigal Bowling Club TERRIGAL BOWLING CLUB & CBD AREA FLOOD STUDY  Aug 1995
     
UMINA    
Kahibah Creek KAHIBAH CREEK FLOODPLAIN FLOOD STUDY
Apr 1991
  KAHIBAH CREEK FLOODPLAIN MANAGEMENT STUDY
Apr 1991
  KAHIBAH CREEK FLOODPLAIN MANAGEMENT PLAN
Apr 1996
     
 WAGSTAFFE

  WAGSTAFFE DRAINAGE STUDY
Nov 2000
     
WAMBERAL    
Wamberal Lagoon WAMBERAL LAGOON FLOOD STUDY
Nov 2001
  WAMBERAL LAGOON FLOODPLAIN MANAGEMENT STUDY
Nov 2001
  WAMBERAL LAGOON FLOODPLAIN MANAGEMENT PLAN
Nov 2001
     
WOY WOY    
Woy Woy, Umina, Ettalong WOY WOY, UMINA, ETTALONG PENINSULA DRAINAGE STRATEGY STUDY
Jun 1992
Woy Woy Peninsula WOY WOY PENINSULA FLOOD STUDY
Apr 2010
  WOY WOY PENINSULA FLOOD STUDY - APPENDIX B FIGURES
 
     
WYOMING    
Wyoming, Wingello and Bradys Gully Creek WYOMING, WINGELLO AND BRADYS GULLY FLOOD STUDY
Nov 1991
Brooks Avenue FLOOD INVESTIGATION
Nov 1993
Wyoming, Wingello and Bradys Gully Creek WYOMING, WINGELLO AND BRADYS GULLY CREEKS FLOODPLAIN MANAGEMENT STUDY - FINAL REPORT
Nov 1993
  BRADYS GULLY CREEK FLOODPLAIN MANAGEMENT PLAN - FINAL REPORT
Nov 1993
  WINGELLO CREEK FLOODPLAIN MANAGEMENT PLAN -  FINAL REPORT
 Nov 1993
  WYOMING CREEK FLOODPLAIN MANAGEMENT PLAN - FINAL REPORT
Nov 1993
Bradys Gully - Blanch St Area BRADYS GULLY BLANCHE ST AREA DRAINAGE INVESTIGATION
Jan 1994
     
YATTALUNGA    
Yattalunga UIA YATTALUNGA URBAN INVESTIGATION ZONE - TRUNK DRAINAGE STRATEGY STUDY
Jan 1994

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