Parent Layer: Barwon-Darling Valley FMP 2017

Name: Barwon_Darling_Valley_FMP_Floodway_Network

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Description: 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 floodsthe inundation extent of small and large design floodsareas that preserve floodplain connectivityareas that provide sufficient pondage for floodwater.Two hydraulic categories are mapped in the floodway network:floodways, which are areas where a significant discharge of floodwater occurs during design floodsinundation extent, which includes areas of the floodplain that are important for the temporary storage of floodwaters during the passage of a flood.Two design floods were used to model the floodway network:design flood of 1976 (1.4% AEP at Walgett and 1.2% AEP at Bourke gauging stations i.e. the large design flood)design flood of December 2011 (17% AEP at Walgett and Bourke gauging stations i.e. the small design flood).The floodway network was determined using:hydraulic model outputs:- depth-velocity product maps for the large design flood - areas that reached the depth-velocity product threshold of ≥0.3m2/s were categorised as floodways- areas that support tributary flows and outer floodplain floodways that have a DVP of ≥ 0.1m2/s were also categorised as floodways- discharge and velocity values along flow paths- inundation extent for the small and large design floodsother data:- flood aerial photography and satellite imagery- spatial watercourse layers and topographical mapping- previous rural floodplain management plans and guidelines- local knowledge obtained from floodplain communities and floodplain managers.

Copyright Text: Office of Environment and Heritage: Healthy Floodplains Unit

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• Value: Floodway
  Label: Floodway
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• Value: Inundation extent of the small (2011) and large (1976) modelled design floods
  Label: Inundation extent of the small (2011) and large (1976) modelled design floods
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