Agenda of Floodplain Risk Management Advisory Committee

Reports submitted to the Floodplain Risk Management Advisory Committee to be held on Thursday 17 September 2026.

Floodplain Risk Management Advisory Committee AGENDA AND BUSINESS PAPER

Thursday 17 September 2026

ORDER OF BUSINESS:

CLAUSE PRECIS PAGE

ACKNOWLEDGEMENT OF COUNTRY 2

APOLOGIES 2

Confirmation of Minutes

CM-1 CONFIRMATION OF MINUTES - FLOODPLAIN RISK MANAGEMENT ADVISORY COMMITTEE - 2 JULY 2026 2

DECLARATIONS OF INTEREST 2

Reports from Staff

RP-1 2021-22-FM-0032 - Uranquinty Levee Upgrade - Investigation and Design 3

RP-2 2022-FMP-0103 Humula and Mangoplah Flood Studies 5

RP-3 17866 - Levee System Upgrade - North Wagga 7

RP-4 WWCC MOFFs FFL Amendment review 11

RP-5 Flood Project Implementation Status 75

QUESTIONS WITH NOTICE 77

ACKNOWLEDGEMENT OF COUNTRY

APOLOGIES

Confirmation of Minutes

CM-1 CONFIRMATION OF MINUTES - FLOODPLAIN RISK MANAGEMENT ADVISORY COMMITTEE - 2 JULY 2026

Recommendation

That the Minutes of the proceedings of the Floodplain Risk Management Advisory Committee Meeting held on 2 July 2026 be confirmed as a true and accurate record, noting Council’s adoption of these minutes at its meeting of 10 August 2026.

Attachments

1 ⇩.

FRMAC Minutes - 2 July 2026

DECLARATIONS OF INTEREST

Report submitted to the Floodplain Risk Management Advisory Committee on Thursday 17 September 2026

RP-1

Reports from Staff

RP-1 2021-22-FM-0032 - Uranquinty Levee Upgrade - Investigation and Design

Author: Andrew Mason

Director: Henry Pavitt

Summary:

The project for the design of the levee upgrade has been completed.

Recommendation

That the Floodplain Risk Management Advisory Committee receive and note the update provided in relation to the Uranquinty Levee Upgrade Project.

Report

The levee design and all of the associated reports are complete and have been provided to Council.

The deliverables include:

· IFC Design drawings

· Levee Design Report

· Utility Investigation Report

· Review Of Environmental Factors

· Levee Owners Manual

· Construction Methodology Report

· Safety By Design Report

· Specification Development

· Schedule of Quantities

The project has been finalised, all invoices from the consultant received and paid and milestone claims have been put into the DCCEEW Portal for closure. The final acquittal will be completed and input into the Portal and the project closed out.

Financial Implications

N/A

Policy and Legislation

N/A

Link to Strategic Plan

Regional Leadership

Ethical Leadership

Provide strategic direction and leadership for our region to deliver key community priorities.

Risk Management Issues for Council

N/A

Internal / External Consultation

N/AN/A

Report submitted to the Floodplain Risk Management Advisory Committee on Thursday 17 September 2026

RP-2

RP-2 2022-FMP-0103 Humula and Mangoplah Flood Studies

Author: Andrew Mason

Director: Henry Pavitt

Summary:

WMAWater have completed the Public Exhibition for the flood model and study for Humula and Mangoplah. The final project report has been provided to FRMAC for acceptance.

Recommendation

That the Floodplain Risk Management Advisory Committee receive and note the update provided in relation to the Humula and Mangoplah Flood Studies Project and accept the final model and report.

Report

Council engaged WMAWater in late September 2023, to undertake the Humula and Mangoplah Flood Study.

The Draft Flood Study report has been provided to Council and placed on Public Exhibition for the required 28 days. Community consultations were conducted in Mangoplah on 26August and Humula on 28August.

In response to the poor attendance at the first community session in 2023, the consultation meeting in Mangoplah was conducted in the local Hotel on a more suitable night. There were over 20 people in attendance and feedback was provided on the flood study and other issues in the village such as the flood model for the BESS development. The BESS development area is outside the scope of the Mangoplah flood model and while not a direct issue with the flood model, the concerns from the affected residents were noted and will be considered as part of the planning process.

The Humula consultation meeting was held in the Humula Citizens Sports Club with around 20 people in attendance. The feedback covered a wide range of information and issues and the response to the flood study was positive with no real concerns or issues being raised.

After receiving feedback from the community and Public Exhibition, WMA Water has finalised the update of the Flood Study and the report and WMAwater will be presenting the final report to this meeting.

A time extension until December 2026 has been requested by Council and approved by DCCEEW. This allows time for finalisation of the Public Exhibition, FRMAC meeting and presentation of the final model and report to a Council meeting.

Financial Implications

N/A

Policy and Legislation

N/A

Link to Strategic Plan

Regional Leadership

Ethical Leadership

Provide strategic direction and leadership for our region to deliver key community priorities.

Risk Management Issues for Council

N/A

Internal / External Consultation

N/A

Report submitted to the Floodplain Risk Management Advisory Committee on Thursday 17 September 2026

RP-3

RP-3 17866 - Levee System Upgrade - North Wagga

Author: Dipu Kuriakose

Director: Fiona Piltz

Summary:

The North Wagga Levee Upgrade Project is progressing through the detailed design phase, with the design currently approximately 50% complete. Supporting activities, including property mitigation and easement acquisition, utility relocation, helipad assessment and site-specific investigations, are progressing concurrently.

The project will continue to progress through detailed design and associated investigations in preparation for the next stages of project delivery.

Recommendation

That the Floodplain Risk Management Advisory Committee:

a receive and note the update to the Levee System Upgrade – North Wagga

b consider the proposed helipad location at the intersection of East Street and Mill Street and provide a recommendation on the appropriate finished elevation of the helipad; and

c support ongoing consultation with the NSW State Emergency Service and relevant technical specialists to confirm the required helipad elevation and associated operational requirements prior to finalisation of the detailed design

Report

The North Wagga Levee Upgrade Project continues to progress, with the focus currently on completing the detailed design and associated third-party impact mitigation measures.

NSW Public Works has been engaged as the design consultant for the North Wagga Levee Upgrade Project. Detailed design for the Mill Street and Hampden Avenue sections has reached approximately 50% completion, with design development and coordination continuing across the remaining project areas.

Detailed design for Wilks Park has also reached approximately 50% completion and is currently under review by NSW Public works. The review will inform the next stage of design development and progression towards detailed design completion.

An updated indicative timeline for the implementation of the raised levee and third-party mitigation options is provided below.

Project Phase/ Milestone	Start Date	End Date	Status
Initiation: Engage specialist design consultants to finalise design details and prepare construction specifications and tender documentation.	13/04/2026	13/11/2026	In progress
Planning / Design: Contractor engagement and completion of required approvals, including REF, permits, licences and works approvals.	14/11/2026	14/03/2027	Not due
Pre-construction: Finalise design and commence initial levee works, stormwater upgrades, property protection works, surveys and community consultation.	15/03/2027	15/09/2027	Not due
Construction / Delivery – 25% Completion: Complete 25% of construction works, including levee and stormwater works.	16/09/2027	16/09/2028	Not due
Construction / Delivery – 50% Completion: Complete 50% of construction works, including earthen levee works, stormwater upgrades and sheet piling.	17/09/2028	17/05/2029	Not due
Construction / Delivery – 75% Completion: Complete 75% of construction works and external building protection works.	18/05/2029	18/01/2030	Not due
Closure: Complete all construction works and final project reporting.	19/01/2030	19/04/2030	Not due

For the North Wagga Levee Upgrade, Council has received the following funding:

· $6.1 million in Special Rate Variation (SRV) funding;

· $1.1 million through the Commonwealth Development Grant (CDG); and

· $9.1 million in Disaster Ready Fund (DRF) Round Three funding.

The CDG funding has been utilised for preliminary and enabling works associated with the North Wagga Levee Upgrade, including approximately 50% completion of the detailed design, environmental assessment, survey works, floodgate relining, procurement of penstocks and procurement of sheet piles.

The status of the project is:

· NSW Public Works Authority has been engaged as the design consultant for the North Wagga Levee Upgrade.

· Detailed design for the Mill Street and Hampden Avenue sections has reached approximately 50% completion. Design development and coordination are continuing across the remaining project areas.

· Detailed design for Wilks Park has reached approximately 50% completion and is currently under review by NSW Public works. Detailed investigations at Wilks Park are continuing, including drainage assessments, geotechnical investigations, utility coordination and the design of the bridge path connection.

· NSW Public works continues to coordinate with the NSW State Emergency Service regarding helipad requirements to ensure emergency access and operational capability are maintained following the levee upgrade.

· All residents outside the levee who may be adversely affected by the levee raising have been consulted, and detailed survey information has been obtained for affected properties.

· A property consultant has been engaged to support the easement acquisition process and liaise with affected landowners. Easement drawings have been finalised to support the acquisition process.

· The tender process for electrical works associated with the relocation of overhead powerlines has been completed, with the contract awarded to Inland Power. Council is currently coordinating project commencement with Inland Power.

· Procurement of selected penstocks has been completed to support the future construction program and minimise delays associated with long-lead items.

· Sheet piles for the North Wagga Levee Upgrade have been delivered and are being stored for future construction works.

Financial Implications

N/A

Policy and Legislation

Local Government Act

Development Control Plan 2010

Flood Risk Management Manual

Link to Strategic Plan

Regional Leadership

Ethical Leadership

Provide strategic direction and leadership for our region to deliver key community priorities.

Risk Management Issues for Council

N/A

Internal / External Consultation

N/A

Report submitted to the Floodplain Risk Management Advisory Committee on Thursday 17 September 2026

RP-4

RP-4 WWCC MOFFs FFL Amendment review

Author: Sam Robins

Director: Julie Costa

Summary:

Council engaged GLN Planning and WMS Engineering to review the Flood Planning Area and the Finish Floor Level (FFL) in the MOFFs Study and Plan. The report has now been completed and the recommendations discussed below.

Recommendation

That the Floodplain Risk Management Advisory Committee:

a receive and note a detailed report titled ‘Wagga Wagga Major Overland Flow Flood Planning Level Review’ prepared by GLN and WMS

b support the general principles behind refining the current flood planning area

c note that Council will make the report recommendations available to any future consultant engaged to review and update the current Major Overland Flow Flooding modelling

Report

Background

As previously reported at April’s meeting and updated at July’s meeting, Council engaged GLN and WMS to review Councils ‘Wagga Wagga Major Overland Flow Floodplain Risk Management Study and Plan 2021’ (MOFFs) as follows:

MOFFs modelling

· Review with the intent of removing isolated areas of the FPA created by the level of accuracy within the modelling. Provide a report that justifies the areas to be removed and ensures the recommended changes to the defined FPA remain consistent with the NSW Flood Risk Management Manual.

· Provide Council with advice on whether the edges of the current modelling can be ‘smoothed’, and if so, what would be the cost and time frames involved in this process.

· Provide Council with any other options (excluding remodelling) for improving the accuracy of the modelling in terms of defining the FPA.

MOFFs Study and Plan

· Review recommended FFL with the intent of reducing the requirement for a freeboard in certain circumstances.

· Provide a report that either:

o Supports the proposed amendment to the FFL recommendation and outlines the steps required to implement the amendment correctly, or

o Disagrees with the position to amend the FFL and provides explanation as to why.

· Ensure any recommendation remains consistent with the NSW Flood Risk Management Manual and therefore provide Council the protection it requires under section 733 of the Local Government Act 1993.

Outcomes

The report made a number of conclusions, these have been summarised below:

MOFFs Modelling:

· Identified that the current modelling is broader than necessary and includes areas that do not always justify flood related development controls.

· Recommended a refined flood planning area defined using criteria consistent with approaches applied in other overland flow studies.

· Noted that the refined area would reduce the FPA from 25.8 square kilometres to 23.63 square kilometres and the number of properties (where dwellings are permissible) from 5,846 to 3,140.

· The refinement would better align with planning controls and flood risk, reduce unnecessary constraints and support housing and infill development objectives.

MOFFs Study and Plan

· Identified that the current freeboard approach is broadly consistent with the NSW flood risk management guidance.

· Does not recommend a general reduction in the current freeboard, as any lower freeboard standard would be difficult to justify and at best might only be justifiable in discrete locations.

Next Steps

MOFFs Modelling:

Council currently has a grant application lodged with DCCEEW to fund the review and update of the Wagga Wagga MOFFs model. It is therefore recommended that Council await the outcome of this application before deciding how to proceed with the model update.

If the grant application is successful, the recommendations outlined in this report should be considered when developing the scope of works and tender documentation for the model update.

MOFFs Study and Plan:

There are no further actions required with the outcomes from this section of the report. The DCP is currently being reviewed and updated and will address the issue of freeboard in MOFF events. This report gives weight to impose the freeboard requirement on certain developments impacted by MOFFs.

Financial Implications

Nil

Policy and Legislation

Environmental Planning and Assessment Act 1979

Local Government Act 1993

Link to Strategic Plan

Regional Leadership

Ethical Leadership

Provide strategic direction and leadership for our region to deliver key community priorities.

Risk Management Issues for Council

Ensure any recommendation remains consistent with the NSW Flood Risk Management Manual and therefore provide Council the protection it requires under section 733 of the Local Government Act 1993.

Internal / External Consultation

N/A

Attachments

1 ⇩.

Wagga Wagga Major Overland Flow Flood Planning Level Review -Consultants Report