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Barwon-Darling Valley Floodplain Management Plan 2017
Name: Barwon Darling Valley FMP Management Zones 2017
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Description: The nature and location of the management zones in the Barwon-Darling Valley Floodplain was determined using hydraulic, ecological and cultural criteria as well as criteria to ensure the plan reflects existing floodplain management arrangements. This approach considered the impact of existing and future development on flooding in rivers and floodplains; the flood risk to life and property; the flood connectivity of floodplain assets and the social and economic impacts of restricting flood-work development. Management zones for the Floodplain Management Plan for the Barwon-Darling Valley Floodplain 2017. There are five management zones:Barwon-Darling Management Zone A: includes major drainage lines and other areas where a significant discharge of floodwater occurs during all flood events. The areas are generally characterised by high flood flow velocity and depthBarwon-Darling Management Zone B: includes areas of the floodplain that are important for the conveyance of floodwater during large flood events and for the temporary pondage of floodwaters during the passage of a flood. Its outer boundary is defined by the modelled inundation extent of the large design floodBarwon-Darling Management Zone C: includes elevated areas or areas protected by existing flood work developmentBarwon-Darling Management Zone CU: includes urban areas where there is either a flood study, a flood risk management study, a flood risk management plan, or that are protected by flood mitigation works such as town levees.Barwon-Darling Management Zone D: is a special protection zone for areas of high ecological and/or cultural significance. Criteria used to develop the management zones:MANAGEMENT ZONE AHydraulic criteriaMZ A includes major discharge areas that have a DVP of greater than or equal to 0.3 m2/s for the large design flood (1976).Floodplain connectivity was provided for by incorporating:parts of the small design flood extent (2011) and/orfloodplain areas that support tributary flows and outer floodplain floodways that have a DVP of greater than or equal to 0.10 m2/s for the large design flood (1976).Ecological criteriaMZ A includes, where there is hydraulic justification:semi-permanent wetlandconnections to/through floodplain wetland (flood-dependent shrubland wetlands) and flood-dependent forest/woodland (wetlands)tracts of floodplain land within low-lying areas bordering a watercourse that contain floodplain wetland (flood-dependent shrubland wetland) or flood-dependent forest/woodland (wetlands)key fish passage areas identified using NSW Fish Community Status and Threatened Fish Species Data - Aquatic Biodiversity Value Mapping Project (NSW DPI 2016)Cultural criteriaMZ A includes, where there is hydraulic justification:floodplain areas with Aboriginal values that are highly flood-dependent that were identified during direct community consultation with the local Aboriginal community and/or are listed on the AWIS and AHIMS databaseslocations for scarred/carved trees that are living flood-dependent vegetation that generally require frequent flooding to maintain their ecological character and cultural valuelocations for heritage sites that are flood dependent and are cultural heritage objects and places as listed on Commonwealth, state and local government heritage registers.Existing floodplain management arrangements criteriaExisting floodplain development guidelines prepared to support assessment for applications under Part 8 WA 1912 were reviewed and minor changes were made to MZ A to incorporate this historical flood behaviour information. MZ A was made congruent with the MZ A of the bordering Gwydir, draft Border Rivers, draft Macquarie and draft Lower Namoi Valley FMPs.MANAGEMENT ZONE BHydraulic criteriaMZ B includes the inundation extent of the small and large design floods and any areas protected by existing flood works that are overtopped by the large design flood.Ecological criteriaMZ B includes, where there is a hydraulic justification, flood-dependent woodland and to a lesser degree flood-dependent forest/woodland (wetlands) where there was no hydraulic justification for inclusion in MZ A. Cultural criteriaMZ B includes, where there is hydraulic justification, locations for scarred/carved trees that are living and located within flood-dependent woodland.Existing floodplain management arrangements criteriaMZ B was made congruent with MZ B of the bordering Gwydir, draft Macquarie and draft Lower Namoi Valley FMPs. MZ B includes some area of the floodplain that are enclosed by existing flood works that are designed to be overtopped during moderate to large floods. MANAGEMENT ZONE CHydraulic criteriaMZ C includes flood fringe areas of the floodplain that are outside the large design flood and areas enclosed by existing flood works that are not designed to be overtopped during flooding.Ecological criteriaThe basis of MZ C was not ecological. However, some ecological assets that have been enclosed by existing approved flood works are located in MZ C.Cultural criteriaThe basis of MZ C was not cultural. However, some cultural assets that have been enclosed by existing approved flood works are located in MZ C.Existing floodplain management arrangements criteriaExisting flood-work development identified in floodplain management guidelines were incorporated into MZ C. MANAGEMENT ZONE CUHydraulic criteriaThe basis for MZ CU was not hydraulic.Ecological criteriaThe basis of MZ CU was not ecological.Cultural criteriaThe basis of MZ CU was not cultural.Existing floodplain management arrangements criteriaMZ CU includes floodplain areas that are included within existing urban flood studies, flood risk management studies, or flood risk management plans or that are protected by flood mitigation works such as town levees.MANAGEMENT ZONE DHydraulic criteriaThe basis for MZ D was not hydraulic. Ecological criteriaMZ D includes assets that are a location of landscape feature, such as a swamp, marsh, lagoon, anabranch or billabong with a high degree of floodwater dependency, and:a high degree of habitat complexitya history of supporting a diversity or abundance or waterbird, native fish or frog populationsthe functional capacity to act as an aquatic drought refugeis susceptible to conversion or loss of flood connectivity due to flood-workrecognition in, or protected by a local, state or commonwealth environmental policy.Cultural criteriaMZ D includes areas that have a high degree of floodwater dependency, such as swamps, marshes, lagoons, billabongs, rocky bars or warrambools and have significance to the Aboriginal community, including spiritual, archaeological or resource use-values. These areas were listed on a heritage register or were a place that was recognized for its cultural significance by several senior knowledge holders in the Aboriginal community.Existing floodplain management arrangements criteriaMZ D was reviewed for consistency with existing plans, however, the basis for MZ D did not include existing floodplain management planning arrangements
Service Item Id: 0194ed388fe541c08218c7197e17b73b
Copyright Text: Office of Environment and Heritage: Healthy Floodplains Unit; and Waters, Wetlands and Coasts Science Branch.
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