HEVAE Vegetation Groundwater Dependent Ecosystems Value - Murray

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）采用了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》（High Ecological Value Aquatic Ecosystems, HEVAE）框架。在当前针对新南威尔士州的评估中，HEVAE包含四项核心标准，即多样性、独特性、自然性与重要栖息地。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。
针对极有可能依赖地下水的植被PCT多边形，其最终综合HEVAE得分的计算方式为：先将自然性、多样性、独特性及重要栖息地四项标准的最终得分相加，再将该总和除以单个集水区内所有植被GDE多边形所能达到的最大综合HEVAE得分，以此将评分标准化至0（最低）至1（最高）的区间，实现评分结果的均匀分布。
为便于数据建模与管理，本数据集按以下集水区管理单元进行划分：边境河流-吉德尔（Border Rivers-Gwydir）、中部台地区（Central Tablelands）、中西部地区（Central West）、霍克斯伯里-尼皮恩（Hawkesbury-Nepean）、亨特-中部河流区（Hunter-Central Rivers）、拉克伦（Lachlan）、下墨累-达令（Lower Murray Darling）、墨累（Murray）、默伦比奇（Murrumbidgee）、纳莫伊（Namoi）、北部河流区（Northern Rivers）、南部河流区（Southern Rivers）、南部台地区（Southern Tablelands）、悉尼都会区（Sydney Metro）以及西部片区，其中墨累-达令盆地与远西部片区将进一步按澳大利亚临时生物地理分区（Interim Biogeographic Regionalisation for Australia, IBRA）亚区进行细分。