Agenda of Floodplain Risk Management Committee Meeting

AGENDA

Floodplain Risk Management Committee

Monday, 02 November 2020

4.00pm

Dragon Room (Level 1, Georges River Civic Centre, Hurstville)

and

Skype Online Meeting

Georges River Council – Floodplain Risk Management Committee Meeting - Monday, 2 November 2020 Page 1

ORDER OF BUSINESS

Floodplain Risk Management Committee Meeting

Monday, 02 November 2020

4.00PM

1. OPENING

2. ACKNOWLEDGEMENT OF COUNTRY

3. APOLOGIES / LEAVE OF ABSENCE

4. NOTICE OF WEBCASTING

5. DISCLOSURES OF INTEREST

6. PUBLIC FORUM

7. CONFIRMATION OF MINUTES OF PREVIOUS MEETING

MINUTES - Flood Plain Risk Management Committee Meeting held on 6 May 2019

8. COMMITTEE REPORTS

FRMCC001-20 Presentation of progress of the Overland Flow Risk
Management Study and Plan for Hurstville, Mortdale and Peakhurst Wards by WMA Water, including proposed flood modification measures.

(Report by Design Engineer)............................. 2

Georges River Council - Floodplain Risk Management Committee Meeting - Monday, 2 November 2020 Page 3

Agenda Items

Item: FRMCC001-20 Presentation of progress of the Overland Flow Risk
Management Study and Plan for Hurstville, Mortdale and Peakhurst Wards by WMA Water, including proposed flood modification measures.

Author: Design Engineer

Directorate: Assets and Infrastructure

Matter Type: Agenda Items

RECOMMENDATION:

(a) That the Committee receive and note the presentation by the consultant, WMA Water.

(b) That the Committee reviews and provides feedback on the proposed flood modification measures that are being considered for detailed assessment and potential inclusion within the Flood Risk Management Plan.

EXECUTIVE SUMMARY

1. The consultant has continued work on the preparation of the Overland Flow Risk Management Study and Plan for Hurstville, Mortdale and Peakhurst Wards.

BACKGROUND

2. As you would recall Council held our first Floodplain Management Committee meeting on the 6 May 2019. At this time the consultant did a presentation that included an overview of the flood risk management process, background information as to the existing Flood Study that was undertaken by the previous consultants SMEC, and discussion of the flood model from the study which was being reviewed.

3. The work has been delayed due to a number of factors. This included a lengthy delay in receiving the correct version of the flood model from SMEC, the requirement to conduct a further survey of the drainage system in critical parts of the study area to ensure credibility of the model, and that key Council staff involved in the project were required to focus on the preparation of Council’s Stormwater Management Policy.

4. WMA Water will provide the committee with a briefing including the works undertaken to date and upcoming project development.

5. The consultant identified fourteen (14) flood modification measures in consultation with Council staff by review of the flood model along with knowledge of known problem locations. Upon a preliminary assessment nine (9) of these measures are being further analysed for consideration for the undertaking of a detailed assessment.

6. It is expected that a detailed assessment will be undertaken for approximately five (5) of these measures. This would involve the inclusion of each measure into a multi-criteria matrix that assesses each measure on factors including their cost, indicative impacts on flood levels, indicative reduction in property damage, feasibility, social impacts, environmental impacts, economic impacts and the long-term performance given the continuing impacts of climate change.

FINANCIAL IMPLICATIONS

7. No budget impact for this report.

FILE REFERENCE

D20/264781

ATTACHMENTS

Attachment ⇩1	Attachment One - Flood Modifications Measures - Options Assessment Memorandum
Attachment 2	Attachment Two - Flood Modifications Measures - Options Assessment Memorandum Flood maps - published in separate document