Review of the Narromine Floodplain Risk Management Study and Plan
Narromine Shire Council engaged consultants to undertake a review of the Narromine Floodplain Risk Management Study and Plan which was prepared for the township in 2009. The purpose of the review was to assist Council in refining strategic plans for mitigating and managing the effects of existing flood risk (associated with existing development on flood prone land), future flood risk (associated with any new development on flood prone land) and continuing flood risk (the risk remaining in both existing and future development areas after floodplain risk management measures are implemented).
The review was jointly funded by Council and the NSW Department of Planning, Industry and Environment and aimed to build community resilience towards flooding through informing better planning of development, emergency management and community awareness. Council has established a Floodplain Risk Management Committee which is comprised of relevant council members, state government agencies and community representatives.
The review utilised the results of the Narromine River Bank Levee Feasibility Study which was completed in 2013. Figure 1 attached shows the indicative extent of the 1 in 100 year flood on the Macquarie River at Narromine under present day conditions as defined by this study.
A brief summary of the floodplain risk management measures which form the Narromine Floodplain Risk Management Plan (2009), including their estimated cost is provided below.
Floodplain Management Measures Forming the Narromine Floodplain Risk Management Plan (2009)
|Option||Estimated Cost||Priority Assigned to Implementation of Measure||Status of Measure|
|PM1 – Implement the recommended development controls based on draft Flood Policy for Narromine.||Council staff’s Cost||High||Implemented|
|RM1 – Ensure flood data in this Floodplain Risk Management Study and draft Plan is available to NSW SES for inclusion in flood emergency response.||Council and NSW SES Costs||High||Implemented|
|RM2 – Implement flood awareness and education program for residents and owners of commercial and industrial developments.||NSW SES and Property/Business Owner Costs||High||Implemented|
|FM1 – Feasibility Study of river bank levee.(1,2)||$80,000(1)||High||Completed|
|FM2 – Preparation of detailed design and construction of levee (dependent on the results of the above study).||$1.6 Million(3)||Medium||Yet to be commenced|
|FM3 – Feasibility Study of upgrading the hydraulic capacity of culverts beneath the Parkes Narromine Railway.(4)||$50,000(3)||Medium||Yet to be commenced|
|FM4 – Prepare detailed design and construct culvert works (scheme is dependent on the results of the above study and whether river bank levee scheme is implemented. The river levee would reduce ponding upstream of the railway and possibly reduce the need for improved culverts).(4)||$0.8 Million(3)||Medium||Yet to be commenced|
|Total Cost of Implementing Flood Mitigation Measures FM1, FM2, FM3 and FM4||$2.53 Million(3)|
1. FM1 was completed in 2013. The results of the study are presented in Narromine River Bank Levee Feasibility Study (2013)
2. Scope of floodplain risk management measure refined as part of Narromine River Bank Levee Feasibility Study (2013) and the Narromine Town Levee Concept Design (2016).Figure 1 shows the currently proposed alignment of the river bank levee.
3. Following the adoption of the revised Plan, Narromine Shire Council can seek funding from the NSW State Government under its Floodplain Management Program to cover the majority of the cost of implementing the recommended set of measures.
4. Refer Figure 1 for location of the proposed upgraded culverts.
An electronic copy of the Narromine Floodplain Risk Management Study and Plan (2009) and Narromine River Bank Levee Feasibility Study (2013) can be found below.