Ourimbah Creek Floodplain Risk Management Study & Plan Report

The Ourimbah Creek Floodplain Risk Management Plan has been prepared for the Central Coast Council in accordance with the NSW Government’s Floodplain Development Manual 2005 (Reference 1) and:\r\n Is based on a comprehensive and detailed evaluation of factors that affect and are\r\naffected by the use of flood prone land;\r\n Represents the considered opinion of the local community on how to best manage its flood risk and its flood prone land; and\r\n Provides a long-term path for the future development of the community.\r\n\r\nThe Ourimbah Creek catchment is located on the Central Coast of NSW, approximately 90km north of Sydney. Covering a total area of 160 km2, the majority of the catchment is contained in the Wyong Shire Local Government Area (LGA), with 8 km² of the catchment contained in the Gosford City LGA to the south. In 2016 the two councils were combined into the Central Coast Council.\r\n\r\nFlooding has been recorded periodically since the 1930’s but there are many more recorded instances of flooding in Tuggerah Lakes. It is possible that the incidence of flooding has historically been under reported along Ourimbah Creek and its tributaries. In recent times there have been two significant events, in February 1990 and June 2007. In both these events there was extensive flooding in the Newcastle, Lake Macquarie and Wyong/Gosford regions.\r\n\r\nFlooding causes significant hardship, including both tangible and intangible damages, to the community and for this reason the Central Coast Council has undertaken a program of studies to address the management of the flood problem in accordance with the NSW Government’s Floodplain Development Manual 2005 (Reference 1).

本《乌里马巴溪洪泛区风险管理计划》（Ourimbah Creek Floodplain Risk Management Plan）系为中央海岸委员会（Central Coast Council）编制，符合新南威尔士州政府（NSW Government）2005年版《洪泛区开发手册》（Floodplain Development Manual 2005，参考文献1）的要求，且：
• 基于对受洪泛土地利用影响及反作用于该类土地利用的各类因素开展的全面详尽评估；
• 体现了当地社区就如何最优管控本地洪水风险与受洪泛土地所达成的共识性意见；
• 为社区未来发展提供了长期规划路径。

乌里马巴溪流域（Ourimbah Creek catchment）位于新南威尔士州中央海岸区域，距悉尼以北约90公里。该流域总面积达160平方公里，主体位于怀永郡地方政府辖区（Wyong Shire Local Government Area, LGA）内，南部有8平方公里流域隶属于戈斯福德市地方政府辖区（Gosford City LGA）。2016年，上述两个地方政府合并为中央海岸委员会。

自20世纪30年代起，流域内便有洪水记录，但图格拉赫湖（Tuggerah Lakes）的洪水记载案例更为丰富。历史上，乌里马巴溪及其支流的洪水事件可能存在漏报情况。近期发生过两次重大洪水事件，分别为1990年2月与2007年6月，两次事件均导致纽卡斯尔、麦考里湖及怀永/戈斯福德区域出现大范围洪涝。

洪水会给社区带来包括有形与无形损失在内的严重危害，基于此，中央海岸委员会依据新南威尔士州政府2005年版《洪泛区开发手册》（参考文献1），开展了一系列洪水问题治理相关研究工作。