Parent Layer: Border Rivers Valley Floodplain Management Plan 2020

Name: Border Rivers Valley FMP Management Zones 2020

Display Field: Management_Zone

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Description: Used as part of the Healthy Floodplain for the Border Rivers ValleyFloodplain Management Plan(FMP).The nature and location of the management zones proposed for the Border Rivers Valley Floodplain was determined using hydraulic, ecological and cultural criteria as well as criteria to ensure the plan reflects current floodplain management arrangements. The approach for developing the management zones 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.The Border Rivers Valley FMP 2020contains five different management zones:1. Management Zone A (MZ A) – Major discharge areas, defined floodways (124,359 ha or 23% of the FMP). These areas are generally characterised by relatively high flood-flow velocity and depth (DVP ≥ 0.3 m2/s for large design flood, 1976, 1.3% AEP). 2. Management Zone C (MZ B) – Flood storage and secondary flood discharge (285,755 ha or 51% of the FMP). It is important for the conveyance of floodwater during large flood events and for the temporary pondage of floodwaters during the passage of a flood. It includes ecological assets that have a moderate level of flood dependency, and also includes cultural assets such as modified trees that are likely to only be flood connected during moderate and large floods.3. Management Zone C (MZ C) — Flood fringe and flood protected developed areas (145,590 ha or 26 % of the FMP). MZ C also includes areas protected by flood works that are unlimited height and are not overtopped by water during moderate to large floods. The rules and assessment criteria of MZ C are less restrictive than other management zones as MZ C includes areas where flood work development is unlikely to have a significant effect on flood behaviour. Nevertheless, flood works still require an assessment and approval to protect the health of the floodplain environment.4. Management Zone CU (MZ CU) – Urban areas managed by Local Council (600 ha or less than one % of the floodplain). It includes parts of urban areas where flood risk is managed by local government authorities through flood risk management plans and studies developed in accordance with the Floodplain Development Manual (NSW Government 2005).5. Management Zone D (MZ D) – Special environmental and cultural protection zone (153 ha or less than one % of the floodplain). These areas are subject to frequent inundation and have high ecological and/or cultural value.

Service Item Id: 0194ed388fe541c08218c7197e17b73b

Copyright Text: NSW Department of Planning, Industry and Environment: Healthy Floodplains Unit, Biodiversity and Conservation Branch; and Waters, Wetlands and Coasts Science Branch,

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