Simon Hunter

Simon Hunter

Simon Hunter, Australia

Simon Hunter is a Senior Environmental Scientist with the Water and Wetlands Team, NSW Office of Environment and Heritage, Sydney. Since 2013, Simon has lead the ecological assessment work for the NSW Healthy Floodplains Project across six northern valleys in NSW’s Murray-Darling Basin – the Gwydir, Border Rivers, Upper Namoi, Lower Namoi, Macquarie, and the unregulated Barwon-Darling River valley. Simon has worked on a range of wetland projects for the NSW Office of Environment and Heritage, including the NSW Wetland Recovery Program and the Rivers Environmental Restoration Program (2006-2010). Simon holds a Master of Science and Technology (Spatial Information), University of New South Wales (2009) and a Bachelor of Applied Science – Resource and Environmental Science, University of Canberra (1997).

Presentation Title: Valley-wide floodplain management plans in NSW’s northern Murray-Darling Basin: protecting and maintaining floodplain and wetland connectivity

The fertile soils and water resources made abundant during floods contribute to floodplains being some of the most productive lands in Australia. In rural floodplains in the northern Murray-Darling Basin, levee banks and other flood works have been built to further enhance agricultural productivity. These works have improved land used for grazing, dryland and irrigated cropping. However, when built in an uncoordinated way these works can change over-bank flood behaviour, including impacting on flood connectivity to floodplain wetlands that depend on flooding to maintain their ecological character. To protect the passage of flood water through 5.2 million hectares of flood-prone country, six rural floodplain management plans are being prepared for the northern valleys of the Murray-Darling Basin in NSW. The Department of Primary Industries, Water and the Office of Environment and Heritage are working together as part of the NSW Healthy Floodplains Project to make these plans under the Water Management Act 2000. The plans use management zones and rules to co-ordinate the development of new flood works and amendments to existing flood works. Funding for the project is provided by the Australian Government’s Sustainable Rural Water Use and Infrastructure Program as part of the implementation of the Murray-Darling Basin Plan in NSW. This presentation will provide examples from the plan made for the Gwydir Valley, including detailing the criteria used to map management zones across the extent of major flooding. Focus will be on the hydraulic criteria used to develop the floodway network and the ecological criteria used to protect riverine-floodplain connectivity important for conveying water to flood-dependent ecological assets. Key to the team’s success has been leveraging improvements in computers used for two-dimensional hydraulic modelling, liaising with officers managing licensed environmental water deliveries and using best-available ecological data and LiDAR derived Digital Elevation Models.

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