Parent Layer: Border Rivers Valley FMP 2020

Name: Border_Rivers_Valley_FMP_Floodway_Network

Display Field: Floodway

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Description: Used as part of the Healthy Floodplain Border Rivers ValleyFloodplain Management Plan.he floodway network was the hydraulic basis for determining the management zones, rules and assessment criteria of the Border Rivers Valley FMP. The floodway network is based on two-dimensional (2D) hydraulic modelling (using TUFLOW software), existing floodway networks in current FMPs, stream orders, flood imagery, ADS imagery, LiDAR and ADS DEMs, 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. The Border Rivers floodway network is comprised of two hydraulic categories:• a coordinated and integrated network of floodways where a significant discharge of floodwater occurs • the inundation extent of small and large design floods, which includes areas of the floodplain that are important for the temporary storage of floodwaters during the passage of a flood and for secondary flood discharge, and that preserve floodplain connectivity.Two design floods were selected for the Border Rivers Valley FMP:• large design flood – February 1976 (approximately 1% AEP @ Mungindi and 1.3% AEP @ Boggabilla), and• small design flood – 13% AEP flood (equivalent to the January/February 2013 flood at Mungindi)A flood frequency analysis was undertaken to assist with the selection of the design floods. The flood frequency analysis was used to determine the relationship between peak flood discharge at a location of interest and the likelihood that a flood event of that size or greater would occur. This analysis uses available flow records, which may include records from when the flooding regime was relatively natural, as well as information that encompasses the existing flooding regimes. The Border Rivers floodway network is comprised of 2 hydraulic categories:1) floodways (122,813 ha or 22 % of the floodplain), which are areas where a significant discharge of floodwater occurs during design floods and are important for the continuity of flood flows over the floodplain. 2) Inundation extent ( 289,454 ha or 52% of the floodplain), which includes areas of the floodplain that are important for the temporary storage of floodwaters during the passage of a flood and for secondary flood discharge.The remaining 146,178 or about 26 % of the floodplain was outside of the inundation extent of the large design flood and was therefore not included as part of the floodway network. Hydraulic model outputs used include a depth-velocity product (DVP) map from the large design flood and inundation extents of the small and large design floods.

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