Parent Layer: Macquarie Valley FMP 2020 DRAFT

Name: Macquarie_Valley_FMP_Floodway_Network

Display Field: Floodway_Network

Type: Feature Layer

Geometry Type: esriGeometryPolygon

Description: The floodway network is the hydraulic basis for the management zones, rules and assessment criteria of the rural Floodplain Management Plan for the Macquarie Valley Floodplain2020. The floodway network map represents floodplain areas 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 floodsthe inundation extent of small and large design floodsareas that preserve floodplain connectivityareas that provide sufficient pondage for floodwater.Three hydraulic categories are mapped in the floodway network:floodways (190,900 hectares (ha) or 15% of the floodplain), which are areas where a significant discharge of floodwater occurs during the November 2000 large design flood (8% AEP at Narromine gauging station) upstream of Warren and the Oxley Highway, and the August 1990 large design flood (3% AEP at Narromine gauging station) downstream of Warren and the Oxley Highwayhigh-level floodways (17,300 ha or 1% of the floodplain), which are areas upstream of Warren and the Oxley Highway that are important for conveying and temporary storage of floodwaters, and where a significant discharge of floodwater occurs during the August 1990 large design flood and larger eventsinundation extent (392,100 ha or 32% of the floodplain), including areas of the floodplain that are important for the temporary storage of floodwaters during the passage of a flood.The floodway network was determined using:Hydraulic model outputsdepth-velocity product maps for the large design floods (areas with a depth-velocity product threshold of ≥0.1m2/s were categorised as floodways)discharge and velocity values along flow pathsinundation extent for the small and large design floodsOther dataflood aerial photography and satellite imageryspatial watercourse layers and topographical mappingprevious rural floodplain management plan and guidelineslocal knowledge obtained from floodplain communities and floodplain managers.Approximately 648,100 ha, or 52% of the Macquarie Valley Floodplain, is outside the inundation extent of thesmall andlarge design floods and/or an urban area where there is either a Flood Study, a floodplain risk management study, a floodplain risk management plan or the area is protected by a flood mitigation work, such as a town levee.These floodplain areas arenot part of the floodway network.

Copyright Text: The Environment, Energy and Science Group (Healthy Floodplains Team) in conjunction with the Water Group within the Department of Planning, Industry and Environment.

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Spatial Reference: 28355  (28355)

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• Value: Floodways
  Label: Floodways
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• Value: High-level floodways (upstream of Warren)
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• Value: Inundation extent
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Fields:

• OBJECTID ( type: esriFieldTypeOID, alias: OBJECTID )
• Floodway_Network ( type: esriFieldTypeString, alias: Floodway_Network, length: 150 )
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