Parent Layer: Upper Namoi Valley FMP 2019

Name: Upper_Namoi_FMP_Floodway_Network

Display Field: Floodways

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Description: Floodway network (hydraulic basis for the management zones) was designated based on 2D hydraulic modelling, existing floodway networks in current FMPs(Namoi water plan), stream orders, flood imagery, ADS40 DEM, topographical mapping and slope.The Floodway Network Map represents those areas on the floodplain that have adequate hydraulic capacity and continuity to effectively convey flood waters. It is comprised of: a coordinated and integrated network of floodways where a significant discharge of floodwater occurs during floods, andthe inundation extent of small and large design floods, andareas of significant discharge of the large design flood, andareas that preserve floodplain connectivity, and areas that provide sufficient pondage for floodwater.The Upper Namoi floodway network is comprised of three hydraulic categories: Defined floodways (37,000 ha or 6% of the floodplain), which are major discharge areas with definedchannels or riverbanks. A significant discharge of floodwater occurs during design floods and these areasare important for the continuity of flood flows over the floodplain. Ill-defined floodways (39,700 ha or 7% of the floodplain), which are major discharge areas that areoverland flow paths with no defined channels or riverbanks. A significant discharge of floodwater occursduring design floods and these areas are important for the continuity of flood flows over the floodplain. Inundation extent (255,400 ha or 43% of the floodplain), which includes areas of the floodplain that areimportant for the temporary storage of floodwaters during the passage of a flood and for secondary flooddischarge. Flood works that are limited height are included in the inundation extent, whereas those that arenot overtopped by flooding are excluded.

Copyright Text: OEH Healthy Floodplains Team

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• Value: Flood Storage and Secondary Flood Discharge
  Label: Flood Storage and Secondary Flood Discharge
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• Value: Major Discharge Areas - Ill-Defined Floodways
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