INQ332 | Tools: BNHCRC Driving Change

TitleLong

Maribyrnong River Flood Event, Independent Review

INQAuthor

Melbourne Water

Year

2023

InquiryType

DisasterType

State

Status

Recommendations for this Inquiry

INQ-ref	REC-UID	CODE	SubCode	SrcNUM	Recommendation
INQ332	REC332-4434	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 1	Melbourne Water should review their flood models every five years and update them at least every 10 years and after the occurrence of a major flood.
INQ332	REC332-4447	B - Preparedness B - Preparedness	39 - Disaster Risk Management 39 - Disaster Risk Management	Recommendation 14	Melbourne Water should investigate the feasibility of installing one way valves on the outlets from the street and yard drainage from Evergreen Avenue (Rivervue Retirement Village).
INQ332	REC332-4446	B - Preparedness B - Preparedness	1 - Land-use and building regs 1 - Land-use and building regs	Recommendation 13	Melbourne Water should investigate how it came to be satisfied with the reduction of the flood levels and finished floor levels at the Rivervue Retirement Village as specified in the endorsed plans dated 2 June 2009.
INQ332	REC332-4445	B - Preparedness B - Preparedness	1 - Land-use and building regs 1 - Land-use and building regs	Recommendation 12	Melbourne Water should seek the approval of the Minister for Planning to apply interim planning controls designating the Land Subject to Inundation Overlay in locations where flooding occurred, pending the update to the Mid Maribyrnong flood model.
INQ332	REC332-4444	C - Response C - Response	15 - Inter-service cooperation 15 - Inter-service cooperation	Recommendation 11	Melbourne Water should consult with the Bureau of Meteorology to develop rainfall forecasts more frequently than six hours.
INQ332	REC332-4443	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 10	Melbourne Water should have a protocol that enables flood forecasting at intervals at less than two hours when prudent to do so by reason of the responsiveness of the catchment for significant events.
INQ332	REC332-4442	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 9	Melbourne Water should immediately update the Mid Maribyrnong flood model with a modern two dimensional flood model developed in accordance with Melbourne Water guidelines and use this model to set new design flood levels.
INQ332	REC332-4441	B - Preparedness B - Preparedness	1 - Land-use and building regs 1 - Land-use and building regs	Recommendation 8	Melbourne Water should take account of the change in land use and projected changes to land use when setting flood levels for planning and development and the application of the Land Subject to Inundation Overlay.
INQ332	REC332-4440	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 7	Melbourne Water should commission an independent expert review and audit of their forecasting system with the aim of identifying areas where forecast accuracy, warning times and model run times could be improved.
INQ332	REC332-4439	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 6	Melbourne Water should use the hydraulic model being developed (expected to become available in April 2024) to determine (and be subjected to independent peer review) the impact of the Flemington Floodwall and the efficacy of the associated downstream compensatory works.
INQ332	REC332-4438	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 5	Melbourne Water should adopt forecasting tools which enable forecasts to be made within a total of no more than 60 minutes.
INQ332	REC332-4437	F - Research and technology F - Research and technology	23 - Climate Change 23 - Climate Change	Recommendation 4	Melbourne Water should take account of the best estimates of the impact of climate change when setting flood levels for planning and development and the application of the Land Subject to Inundation Overlay.
INQ332	REC332-4436	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 3	Melbourne Water should ensure that their rating curves, which represent the relationships between river levels and corresponding river flows, extend also to rare and extreme flood events and have been derived using established bestpractice.
INQ332	REC332-4435	F - Research and technology F - Research and technology	13 - Mapping and data quality 13 - Mapping and data quality	Recommendation 2	Melbourne Water needs to ensure that rainfall runoff and flood models are calibrated to observed flood information.
INQ332	REC332-4448	B - Preparedness B - Preparedness	39 - Disaster Risk Management 39 - Disaster Risk Management	Recommendation 15	Melbourne Water should investigate long term sustainable flood mitigation options for the Maribyrnong River.