Parent Layer: Macquarie Valley Floodplain Management Plan 2021

Name: Macquarie Valley Floodplain Boundary 2021

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Description: The rural Floodplain Management Plan for the Macquarie Valley Floodplain 2020 applies to the area defined as the Macquarie Valley Floodplain, which covers 1.24 million hectares. This area is declared to be a floodplain under the Water Management (General) Regulation 2011. This boundary captures the floodplain areas inundated during flooding of major rivers, and any flood works that may affect flooding. The Macquarie Valley Floodplain boundary was delineated based on the consideration of the following:Designated floodplainsExisting and potential floodplain developments in the Macquarie Valley Floodplain were identified from the following floodplain areas designated under Part 8 of the Water Act1912:Lower Macquarie floodplain (designated in 1985)Macquarie River floodplain (designated in 2008 as part of the Macquarie River (Narromine to Oxley Station) FMP 2008) The Water Act 1912 was repealed in 2015 and all existing designated floodplains under this Act transitioned across to the Water Management Act 2000.Hydrology of the Macquarie RiverFloodplain areas influenced primarily by the hydrology of the Macquarie River were included within the Macquarie Valley FMP floodplain boundary and were determined by examining the following information:flood imagery of the 1990 and 2010 floodsMacquarie Valley Floodplain Atlas (Sinclair Knight and Partners Pty Ltd 1984b)DPIE EES inundation mapping (Fisher et al. 2016; Thomas et al. 2015; Thomas et al. 2010)2008, 2014 and 2015 LiDAR Digital Elevation Models (DEMs)hydrodynamic modelling of the Macquarie River and Marthaguy Creek flows.The floodplain was extended from the Macquarie River floodplain for the Macquarie River (Narromine to Oxley Station) FMP 2008 to include the Macquarie Marshes and the effluent creek system. Part of the floodplain of Marthaguy Creek, a tributary of the Macquarie River, was also included because of significant flooding during the December 2010 flood and the contribution of substantial inflows to the Macquarie River. Areas considered not to be predominantly influenced by the hydrology of the Macquarie River, including the lower Bogan and Castlereagh floodplain, were not included in the Macquarie Valley Floodplain. Areas of high ground considered to be above the level of flood-liable land were determined from LiDAR-derived DEMs and contour mapping. These areas were also checked against available flood imagery and flood-dependent vegetation mapping. High ground areas including Mt Foster, Mt Harris and other hills were extracted from the floodplain.Hydraulic effects of developmentThe floodplain area was extended to include flood works outside existing designated floodplain areas, to meet the objectives of the Macquarie Valley FMP and assist with the coordination of all flood works across the extent of major flooding. Cadastral featuresWhere appropriate, the floodplain was aligned with significant cadastral features (e.g. property, parish, county and Local Government Area (LGA)) to simplify administration and provide clarity to water users. Planning legacy (unregulated water sharing plans)The Macquarie Valley Floodplain is entirely within the water management area of the Water Sharing Plan (WSP) for the Macquarie Bogan Unregulated and Alluvial Water Source(2012a). However, alignment of the floodplain boundary with the water management areas of the WSP was not considered important by the Macquarie Technical Advisory Group, as these areas are not delineated according to flooding characteristics. Floodplain harvestingThe floodplain boundary included areas identified in the Floodplain Harvesting Project’s expression of interest process for floodplain harvesting licences and potential floodplain harvesting structures. This will ensure consistency with the NSW Floodplain Harvesting Policy (NSW DPI 2013), which only applies to floodplain harvesting activities on properties where all or part of a property lies within the designated floodplain. Other rural FMP floodplain boundariesThe Macquarie Valley Floodplain was aligned with the boundary for the Barwon–Darling Valley FMP 2017 (NOW 2017) to provide consistency with other boundaries for water management plans under the Water Management Act 2000.Public infrastructure featuresWhere appropriate, the boundary aligns with public infrastructure such as railways and State and Council roads to simplify administration.Urban floodplain management arrangementsWhere appropriate, the boundary aligns with existing floodplain management arrangements in urban areas, such as a Flood Study, Floodplain Risk Management Study (FRMS) and Floodplain Risk Management Plan (FRMP). Amendments to the boundary were made based on information from councils regarding the extent of flood risk management planning arrangements in urban areas.

Service Item Id: 0194ed388fe541c08218c7197e17b73b

Copyright Text: The Environment, Energy and Science Group (Healthy Floodplains Team) in conjunction with the Water Group within the Department of Planning, Industry and Environment.

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