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Parent Layer: Lower Namoi Valley Floodplain Management Plan 2020

Name: Lower Namoi Valley Floodplain Boundary 2020

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Description: The Lower Namoi Valley Floodplain Boundary, which covers 570,700 hectares, was defined to capture the floodplain areas inundated during flooding of the major rivers running between Narrabri and Walgett and to include any works that may affect flooding. The existing Lower Namoi Floodplain designated under section 166 Part 8 of the WA 1912 on 18 September 1984 was the basis for capturing existing and potential floodplain developments within the floodplain. The overall extent of boundary change when compared to the existing designated floodplain was the addition of 57,400 hectares in some areas and the subtraction of 175,600 hectares in other areas. Changes were made to the existing floodplain to delineate the new Lower Namoi Valley Floodplain boundary.Where appropriate, the boundary was adjusted to align with significant cadastral features, such as the Walgett to Pilliga Road, to ease administration and provide clarity to water users.The largest proposed change is at the northern boundary where 174,000 hectares of the existing floodplain were removed when delineating the new proposed floodplain boundary. This change was proposed to align with the wsp for the Gwydir Unregulated and Alluvial Water Sources 2012. Flood work applications in these areas are now assessed under the Gwydir Valley FMP 2016. The Floodplain Harvesting Project’s register of interest process and potential floodplain harvesting structures were also considered when delineating the proposed boundary; however, no changes were requiredThe boundary of theLowerNamoiValley Floodplain was delineated based on the consideration of the following:Designated floodplains and floodplain development guidelinesLower NamoidesignatedFloodplain The WA 1912 was repealed in 2015 and all existing designated floodplains under this Act transitioned across to the WMAHydraulic effects of developmentThe floodplain was extended to include additional flood works that were outside the existing designated floodplain areas to meet the objectives of the Lower NamoiValley FMP and to assist with the coordination of all flood works across the extent of major flooding.Cadastral and administrative relevanceWhere appropriate, the floodplain was aligned with significant cadastral features (e.g. property, parish, county, LGA and State boundaries; roads and railways) to simplify administration and to provide clarity to water users.Planning legacy (unregulated water sharing plans (WSPs))Where appropriate, the boundary was aligned with unregulated WSP boundaries to ensure consistency with boundaries of water management plans under the WMA, ease of administration and increased clarity for water users.Floodplain harvestingThe floodplain boundary included areas identified through the Floodplain Harvesting Project’s expression of interest process for floodplain harvesting licences and potential floodplain harvesting structures. This ensures consistency with the NSW Floodplain Harvesting Policy (NSW DPI 2013), which only applies to floodplain harvesting activities on properties where all or part of that property lies within the designated floodplain.Other FMP floodplain boundariesThe Lower Namoi Valley Floodplain was aligned with FMP boundaries of the, Upper Namoi,Gwydir, and Barwon Darlingvalleys to provide consistency with other water management plan boundaries under the WMA 2000.Landscape featuresWhere appropriate, the boundary was aligned with significant landscape features, such as weirs, to assist ease of administration and to provide clarity for water users.Lidar and ADS40 DEMs and floodimaery were also used to identify landscape featrues.

Service Item Id: 1b9d15fd27734434b27a02b2d05fe919

Copyright Text: OEH Healthy Floodplains Unit in conjuction with DPI, Water.

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