Richmond Catchment

 6,900km 2 catchment Towards a Catchment Based Model after  1,000km 2 Two Decades of Modelling in the Richmond  5 Local Councils  Over 13 flood models built in 20 years for different areas Ben Caddis (BMT WBM) Michael Wood ( County Council)  Various software and various Toong Chin (NSW Office of Environment and Heritage) schemes (1d, quasi-2d, 1d/2d) Brian Eggins ()

History of Flood Modelling in the Richmond History of Flood Modelling in the Richmond Year Location Purpose Software Modelling 1D Modelling Completed Method 1993 Lismore FS Mike 11 1D 1997 Ballina FS Estry 1D 1990’s Flood Mapping at Ballina 1998 Casino FS Mike 11 1D 1999 Mid-Richmond FS Mike 11 1D 2000 Deep Creek FIA () Tuflow 1D/2D 2002 Casino FRMS Tuflow 1D/2D 2002 Lismore FRMS RMA2 2D 2003 Mid-Richmond FRMS Estry 1D 2004 FS Tuflow 1D/2D 2004 Tuckombil Canal FS Tuflow 1D/2D 2006 Woodburn FIA (Pacific Hwy) Sobek 1D/2D 2006 Newrybar Swamp FIA (Pacific Hwy) Tuflow 1D/2D 2008 Ballina FS Upgrade Tuflow 1D/2D 2009 Kyogle FRMS Tuflow 1D/2D 2009 Wardell and Cabbage Tree Island FRMS RMA2 2D 2009 Ballina FIA (Ballina Bypass) Tuflow 1D/2D 2010 Mid-Richmond FMS Tuflow 1D/2D 2011 Ballina FRMS Tuflow 1D/2D 2012 Newrybar Swamp FRMS Tuflow 1D/2D

History of Flood Modelling in the Richmond Issues with Current Approach 2D Modelling  Inadequate coverage of rural areas  Poor synchronisation of FRMPs  Discrepancies at model interfaces  Inconsistent modelling and mapping approaches  Inadequate use of flood information for flood response Issues with Current Approach Issues with Current Approach Inadequate coverage of rural areas Poor synchronisation of FRMPs

Year Location Purpose Software Modelling Completed Method 1993 Lismore FS Mike 11 1D 1997 Ballina FS Estry 1D 1998 Casino FS Mike 11 1D 1999 Mid-Richmond FS Mike 11 1D 2000 Deep Creek FIA (Summerland Way) Tuflow 1D/2D

2002 Casino FRMS Tuflow 1D/2D 2002 Lismore FRMS RMA2 2D 2003 Mid-Richmond FRMS Estry 1D 2004 Kyogle FS Tuflow 1D/2D 2004 Tuckombil Canal FS Tuflow 1D/2D 2006 Woodburn FIA (Pacific Hwy) Sobek 1D/2D 2006 Newrybar Swamp FIA (Pacific Hwy) Tuflow 1D/2D 2008 Ballina FS Upgrade Tuflow 1D/2D 2009 Kyogle FRMS Tuflow 1D/2D 2009 Wardell and Cabbage Tree Island FRMS RMA2 2D

2009 Ballina FIA (Ballina Bypass) Tuflow 1D/2D

2010 Mid-Richmond FMS Tuflow 1D/2D 2011 Ballina FRMS Tuflow 1D/2D 2012 Newrybar Swamp FRMS Tuflow 1D/2D

Issues with Current Approach Issues with Current Approach Discrepancies at model interfaces Discrepancies at model interfaces

 Uncertainty associated with flood levels, velocities and hazard  Different survey techniques  Different modelling techniques

Issues with Current Approach Issues with Current Approach Inconsistent modelling and mapping approaches Inconsistent modelling and mapping approaches  Design rainfall  Temporal patterns Ballina  IFD  Consistency of parameters  Hydrologic parameters  Hydraulic parameters  Consistency of data  LiDAR / ALS  Photogrammetery  Bathymetry Issues with Current Approach Issues with Current Approach Inconsistent modelling and mapping approaches Inconsistent modelling and mapping approaches

Casino Lismore

Issues with Current Approach Issues with Current Approach Inconsistent modelling and mapping approaches Inadequate use of flood information for flood response  Flood Modification Richmond Valley Interactive Flood Mapping Website  Mitigation assessments / Impact assessments  Structural works under construction / proposed for construction  Live flood model for ongoing impact assessment  Property Modification  Minimum fill policy  Flood risk precincts  Response Modification Lismore  Evacuation planning City  BoM flood warning service Richmond  Teven Valley flood warning system Valley Shire  Community education

Towards a Catchment Based Model Towards a Catchment Based Model Modular ‘mega’ model Modular ‘mega’ model  Design rainfall  Temporal patterns  Ballina (10m, 20m, 40m)  IFD  Newrybar (10, 20m)  Standardisation of parameters  Mid Richmond (60m)  Hydrologic parameters  Casino (20m, 60m)  Hydraulic parameters  Lismore (5m, 20m, 60m)  Consistency of data  Wilsons River (20m)  LiDAR / ALS  (20m)  Photogrammetery  Bathymetry

17 18 Towards a Catchment Based Model Looking Forward One single model run file  Richmond Flood Database  Catchment geometry  Historical for calibration simulations  Additional areas to be modelled and mapped  Existing case for impact assessment benchmarking  Standardisation of mapping  Future case for impact assessments or planning purposes  Flood event  Refinements in areas for more detailed modelling  Historical events (seven calibration events are currently incorporated representing significant floods across different parts of the catchment)  Mitigation assessment  Design events  Black water event analyses  various return periods  various event durations  Review of gauges  joint probability event combinations  Standardisation of datums  tidal conditions  climate change allowances  Flood warning  Location  One or more of seven different sub-models

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