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The Border Rivers Valley floodplain, which covers 558,440 hectares, was defined to capture the floodplain areas inundated during flooding of the major rivers and to include any works that may affect flooding. Defining the Border Rivers Valley Floodplain boundary was based on the consideration of the following:• Designated floodplains and floodplain development guidelinesExisting and potential floodplain developments in the Border Rivers Valley Floodplain were identified from the following existing floodplain areas designated under Part 8 of the WA 1912: o Lower Macintyre (Yelarbon Crossing to Mungindi) floodplain which was designated under Section 166 Part 8 of the WA 1912 on 31 July 1985o Floodplain development guidelines for the Macintyre River and Whalan Creek floodplains between Boggabilla and Mungindi (WRC 1981)The existing Lower Macintyre (Yelarbon Crossing to Mungindi) designated floodplain was used as the basis for the Border Rivers Valley Floodplain to capture existing and potential floodplain developments within the floodplain.Where appropriate, the floodplain was extended to include the floodplain development guidelines for the Macintyre River and Whalan Creek floodplains between Boggabilla and Mungindi (WRC 1981).• Hydraulic effects of developmentThe floodplain was extended to include additional flood works located outside the existing designated floodplain area to meet the objectives of the Border Rivers Valley 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. state, property, parish, county and LGA boundaries, roads and railways) to simplify administration and to provide clarity to water users.• Planning legacy (unregulated WSPs)Where appropriate, the boundary was aligned with relevant unregulated WSP boundaries to ensure consistency with other boundaries for water management plans under the WM ACT 2000, ease of administration and increased clarity for water users.• Floodplain harvestingThe floodplain boundary included areas identified through the Floodplain Harvesting Program’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 that property lies within the designated floodplain.• Other Valley FMP floodplain boundariesThe Border Rivers Valley Floodplain was aligned with the boundaries of the Gwydir Valley FMP 2016 and the Barwon-Darling Valley FMP 2017 to provide consistency with other water management plan boundaries under the WM ACT 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. The overall extent of boundary change when compared to the existing designated floodplain was the addition of approximately 113,840 hectares in some areas and the subtraction of approximately 62,990 hectares in other areas |