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).

新南威尔士州水资源署（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（High Ecological Value Aquatic Ecosystems, HEVAE）识别指南框架。在当前针对新南威尔士州的评估中，HEVAE包含四项核心标准：多样性、独特性、自然性与关键生境。因此，HEVAE地下水依赖型（Groundwater Dependent, GDE）植被价值图层由四项独立的标准图层组合而成。针对具有高地下水依赖概率的植被PCT多边形，确定了最终的HEVAE综合得分：该得分通过将四项标准（自然性、多样性、独特性与关键生境）的最终得分相加计算得到，随后通过将该得分除以单个集水区内所有植被GDE多边形的HEVAE综合最高得分完成标准化处理，使最终得分均匀分布于0（最低）至1（最高）区间。为便于数据建模与管理，本数据集被划分为以下流域管理区：边境河流-格威迪尔、中部台地、中西部、霍克斯伯里-尼皮恩、亨特-中央河流、拉克伦、下墨累-达令、墨累、马兰比吉、纳莫伊、北部河流、南部河流、南部台地、悉尼都会区以及西部分区（其中墨累-达令盆地（Murray-Darling Basin, MDB）与远西部区域进一步细分为澳大利亚生物地理临时分区（Interim Biogeographic Regionalisation for Australia, IBRA）亚区域）