Parent Layer: Lower Namoi Valley Floodplain Management Plan 2020

Name: Lower Namoi Valley FMP Management Zones 2020

Display Field: Management_Zone

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Description: Used as part of the Healthy Floodplain for the Lower NamoiValleyFloodplain Management Plan(FMP).The nature and location of the management zones for the Lower Namoi Valley Floodplain was determined using hydraulic, ecological and cultural criteria as well as criteria to ensure the plan reflects current 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 Lower NamoiValley Floodplain 2019.The Lower Namoi Valley FMP has 6 management zones: 1)MZ AD – Major discharge areas, defined floodways (133,700 hectares or 23% of the FMP)These areas are generally characterised by relatively high flood-flow velocity and depth (≥ 0.2 m2/s for large design flood, 1971, 4% AEP). 2)MZ AID – Major discharge areas, ill-defined floodways (21,400 hectares or 4 % of the FMP)The ill-defined floodways are major discharge areas, which are major discharge areas but where the selected depth-velocity product thresholds do not support the delineation of a defined floodway. Ill-defined floodways must have a depth velocity product of at least 0.05 m2/s for the large design flood (1971 – 4% AEP). Ill-defined floodways are the width of the upstream 3)MZ B – Flood storage and secondary flood discharge (189,600 hectares or 33% 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.4)MZ C – Flood fringe and flood protected developed areas (221,800 hectares or 39 % 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.5)MZ CU – Urban areas managed by Local Council (2800 hectares or less than 1 %of the FMP)It includes parts of Narrabri and Wee Waa that are 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).6)MZ D – Special environmental and cultural protection zone (1500 hectares or less than 1 % of the FMP)These areas are subject to frequent inundation and have high ecological and/or cultural value.

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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