HEVAE Vegetation Groundwater Dependent Ecosystems Value - Western Division

NSW DoI Water has adopted the Guidelines for Identifying High Ecological Value Aquatic Ecosystems (HEVAE) framework developed by the Australian Commonwealth Government. In the current assessment for NSW, the HEVAE consists of four key criteria which include diversity, distinctiveness, naturalness and vital habitat. Therefore, the HEVAE vegetation GDE value layer is a combination of four individual criterion layers. The final or overall HEVAE score was determined for vegetation PCT polygons which has a high probability of being groundwater dependent. This was calculated by adding together the final scores for each criterion (Naturalness, Diversity, Distinctiveness and Vital Habitat). This score was then standardised by dividing by the maximum combined HEVAE score for a whole catchment’s vegetation GDE polygons to provide an even spread of score outcomes between 0 (lowest) and 1 (highest). For ease of data modelling and management, the dataset was divided into the following catchment management areas; Border Rivers-Gwydir, Central Tablelands, Central West, Hawkesbury-Nepean, Hunter-Central Rivers, Lachlan, Lower Murray Darling, Murray, Murrumbidgee, Namoi, Northern Rivers, Southern Rivers, Southern Tablelands, Sydney Metro and Western Division (MDB and far west subdivided further into the IBRA Sub regions).

新南威尔士州水务部（NSW DoI Water）已采用澳大利亚联邦政府制定的《高生态价值水生生态系统识别指南》（HEVAE）框架。在针对新南威尔士州的当前评估中，HEVAE包含四项核心标准，即多样性、独特性、自然性与关键生境。因此，HEVAE植被地下水依赖生态系统（Groundwater Dependent Ecosystem，GDE）价值图层由四项独立的标准图层组合而成。针对极大概率依赖地下水的植被PCT多边形区域，将计算得到最终的整体HEVAE得分：该得分通过将自然性、多样性、独特性与关键生境四项标准的最终得分相加得出。随后，通过将该得分除以整个集水区内植被GDE多边形的最大合并HEVAE得分完成标准化处理，使得分结果在0（最低）至1（最高）区间内均匀分布。为便于数据建模与管理，本数据集被划分为以下集水区管理单元：边境河流-吉德尔（Border Rivers-Gwydir）、中部台地（Central Tablelands）、中西部（Central West）、霍克斯伯里-内皮尔（Hawkesbury-Nepean）、亨特-中央河流（Hunter-Central Rivers）、拉克兰（Lachlan）、下默里-达令（Lower Murray Darling）、默里（Murray）、穆伦比吉（Murrumbidgee）、纳莫伊（Namoi）、北部河流（Northern Rivers）、南部河流（Southern Rivers）、南部台地（Southern Tablelands）、悉尼都会区（Sydney Metro）及西部片区（MDB与远西片区进一步根据澳大利亚临时生物地理分区（Interim Biogeographic Regionalisation for Australia，IBRA）子区域进行细分）。