Williamtown - Salt Ash Floodplain Risk Management Study & Plan - Hydraulic Model

Study used TUFLOW hydraulic model from Williamtown Salt Ash FS Review (BMT WBM, 2012). The key updates for the revised modelling include:\r\n* Updated topographical data using the 2013 LiDAR data set acquired by NSW Land and Property Information. Previous modelling utilised the 2007 LiDAR data set acquired by NSW Department of Planning.\r\n* Update of Hunter River design flood flows through revised flood frequency analysis (FFA) at Raymond Terrace. An FFA from a 1994 study has been used as the basis for design flood estimation in the Hunter Estuary for subsequent studies and has now been revised as part of the current study; \r\n* Additional climate change scenario modelling. This included establishment of design flood conditions consistent with definition of design flood planning levels in current Council planning policy.

本研究采用了源自《Williamtown Salt Ash FS Review》（BMT WBM，2012）的TUFLOW水力模型。本次修正建模的关键更新内容包括：
* 采用新南威尔士州土地与房产信息局（NSW Land and Property Information）2013年获取的激光雷达（LiDAR）数据集更新地形数据；此前的建模工作使用的是新南威尔士州规划厅（NSW Department of Planning）2007年获取的激光雷达数据集。
* 通过对雷蒙德台地（Raymond Terrace）开展修订后的洪水频率分析（FFA），更新亨特河设计洪水流量。此前的多项后续研究均以1994年一项研究的洪水频率分析结果作为亨特河口设计洪水估算的依据，本次研究已将其纳入修订范围；
* 新增气候变化情景建模工作，其中包含确立符合当前地方市政规划政策中设计洪水规划等级定义的设计洪水工况。