GIS data associated with the MURRUMBURRAH FLOODPLAIN RISK MANAGEMENT STUDY AND PLAN 2019-2020

Hilltops Council (Council) commissioned the Floodplain Risk Management Study and Plan for the township of Boorowa. The overall objectives of the Floodplain Risk Management Study (FRMS) were to assess the impacts of flooding, review existing Council policies as they relate to development of land in flood liable areas, consider options for the management of flood affected land and to develop a Floodplain Risk Management Plan (FRMP) which: i) Proposes modifications to existing Council policies to ensure that the development of flood affected land is undertaken so as to be compatible with the flood hazard and risk. ii) Proposes Flood Planning Levels for the various land uses in the floodplain. iii) Sets out the recommended program of works and measures aimed at reducing over time, the social, environmental and economic impacts of flooding. iv) Provides a program for implementation of the proposed works and measures. The FRMS focuses on Main Stream Flooding from the Boorowa River, Ryans Creek and Ryans Tributary, as well as two major un-named tributaries, Minor Tributary Flooding caused by high flows in the minor un-named tributaries which drain to the aforementioned watercourses, and Major Overland Flow areas which occur in the urbanised parts of Boorowa and its immediate surrounds.

The Study builds on flood modelling initially developed in the towns of Morundah, Boree Creek, Oaklands, Rand and Urana in the Federation Villages Flood Study (Jacobs, 2017). Work undertaken in these studies has been expanded upon in this Floodplain Risk Management Study and Plan (FRMS&P) to further understand and determine the nature and extent of the flood risk within each village, and to investigate and recommend potential flood risk management strategies, aligning with current best practice.

Hilltops Council (Council) commissioned the Floodplain Risk Management Study and Plan for the township of Boorowa. The overall objectives of the Floodplain Risk Management Study (FRMS) were to assess the impacts of flooding, review existing Council policies as they relate to development of land in flood liable areas, consider options for the management of flood affected land and to develop a Floodplain Risk Management Plan (FRMP) which: i) Proposes modifications to existing Council policies to ensure that the development of flood affected land is undertaken so as to be compatible with the flood hazard and risk. ii) Proposes Flood Planning Levels for the various land uses in the floodplain. iii) Sets out the recommended program of works and measures aimed at reducing over time, the social, environmental and economic impacts of flooding. iv) Provides a program for implementation of the proposed works and measures. The FRMS focuses on Main Stream Flooding from the Boorowa River, Ryans Creek and Ryans Tributary, as well as two major un-named tributaries, Minor Tributary Flooding caused by high flows in the minor un-named tributaries which drain to the aforementioned watercourses, and Major Overland Flow areas which occur in the urbanised parts of Boorowa and its immediate surrounds.

This document constitutes the first and second stages of the management process for the North Creek catchment. It presents a compilation of the data collected and has defined flood behaviour and flood risk for the catchment area. This study was commissioned under the 2005 NSW Floodplain Development Manual (Reference 1), however, it is recognised that the 2023 Flood Risk Management Manual (Reference 2) was gazetted shortly after the project commenced. While the study was undertaken in accordance with the 2005 manual, there are elements that are consistent to both the 2005 and 2023 manuals. Where appropriate, the 2023 manual is referenced where project methodology or outputs are consistent with the new 2023 manual

This Floodplain Risk Management Study and Plan for the Mudgee Local Creeks has been prepared as part of a Government program to mitigate the impacts of major floods and reduce the hazards in the floodplain. Figure 1.1 shows the study area which comprises the urban part of town on the southern bank of the Cudgegong River. This area is drained by seven creeks in addition to Redbank Creek, which was included in the Mudgee Floodplain Management Study and Plan (Bewsher Consulting, 2002). That study dealt with mainstream flooding from the Cudgegong River which also influences flooding near the junctions with the creeks. The seven creeks investigated in the present study comprise Catchments A to F and Sawpit Gully. The Brief for the study issued by Council generally follows the scope of work required for a Floodplain Risk Management Study as identified in the Floodplain Development Manual (FDM, 2005). The NSW Government’s Flood Prone Land Policy and the FDM, 2005 form the basis of floodplain management in the State. Figure 1.2 shows the steps involved in the floodplain management planning process. This report is Volume 1 of the overall investigation and sets out the findings of the Floodplain Risk Management Study and contains the draft Plan. The results of the updated flood investigations of the various creeks are presented in Volume 2. Section 2 of the Study contains information on baseline flooding conditions on the floodplains, including a review of existing planning policies, assessment of the impacts of flooding on the community, flood warning and preparedness and environmental considerations. Section 3 is a review of possible Floodplain Management Measures which could be included in the Plan. Section 4 details the selection of Floodplain Management Measures. Floodplain Management strategies were assessed using a multi-objective approach based on technical, financial, environmental and social considerations and a preferred strategy outlined. Section 5 presents the elements of the draft Floodplain Risk Management Plan. Section 6 contains a list of definitions of flood related terms used in the study Section 7 contains a list of references.

All project report volumes

This study was undertaken to assist in flood preparedness and risk management activities for the River Murray. The study predicts the flood extent for a range of flows when measured at the border to South Australia which are expressed in megalitres per day (ML/d). Scenario datasets released include: lOOGL,120GL,130GL,140GL, 160GL, 180GL, 200GL, 250GL, 300GL, 341GL.

This study was undertaken to assist in flood preparedness and risk management activities for the River Murray. The study predicts the flood extent for a range of flows when measured at the border to South Australia which are expressed in megalitres per day (ML/d). Scenario datasets released include: lOOGL,120GL,130GL,140GL, 160GL, 180GL, 200GL, 250GL, 300GL, 341GL.

This project was undertaken by consultant WMAwater for Federation Council. The final report was issued on 21 August 2024. It was one of the recommended actions arising from the 2022 Federation Villages Floodplain Risk Management Study and Plan.