NDFF European Water Framework Directive (KRW)

The European Water Framework Directive (EWFD) focuses on protecting all bodies of water and aims for all European waters to meet a 'good status' in 2015 and to encourage Europeans to use water sustainably. The term can be extended with 2 periods of 6 years at the most, which puts the farthest date at 2027. The protection of all waters encompasses rivers, lakes, coastal waters and groundwater.
Assessment program
The European Water Framework Directive (EWFD) focuses on protecting all bodies of water and aims for all European waters to meet a 'good status' in 2015 and to encourage Europeans to use water sustainably. The assessment by the EWFD is determined by a large number of assessments of chemicals, physico-chemical parameters and the presence of species in 4 biological groups: macro fauna, fish, water plants and algae.
The ‘Ecological Status’ is a combination of the assessments of specific biological quality, the physico-chemical quality, other relevant polluting agents and hydromorphology. The biological quality usually determines the ecological quality. Only if that quality is high will the assessments of the physico-chemical quality and other relevant agents be considered to differentiate between high, good and fairly good ecological quality. Only if the hydromorphology is good, can the level of very good quality be achieved.
The quality of other relevant polluting agents refers to substances that are determined per river basin.
The ‘one out, all out’ principle applies to the measurement tools; when one chemical or one biological measurement does not meet the criteria, the overall quality is assessed as unsatisfactory. By applying this principle, the EWFD gives a stringent assessment of the Dutch quality.
Types of water
A distinction is made between 3 types of water in these reports based on the configuration: natural, highly changed and artificial bodies of water. The last 2 types are most common to the Netherlands, with the exception of the Waddenzee. Only a few streams, small rivers and the Naardermeer are categorised as natural waters; the other bodies of water are marked as highly changed. Canals and ditches are artificial waters, since they are man-made.
Aims for a biological and physico-chemical quality.
A scale with 5 classes has been developed to determine biological and physico-chemical quality. The aim is to make sure a body of water is assessed as good or extremely good.
Regarding natural waters, these aims have been established in relation to the natural reference point, the Very Good Ecological Status (ZGET), when the surface water is in a natural condition. The aim for good quality is the Good Ecological Status (GET). When waters are highly changeable, due to a different configuration of the water system, this natural reference point is not feasible, of course. Bodies of water can also be given a lower aim: Good Ecological Potential (GEP).
Of course, there is no natural reference point for artificial bodies of water, but there is a Maximum Ecological Potential (MEP), with the aim of attaining the GEP. Individual artificial bodies of water can be given a lower GEP.
Dataset available via https://www.ndff.nl/english / serviceteamndff@natuurloket.nl
Positive observations without zeros
24,501 records (March 2018)
https://www.ndff.nl/overdendff/validatie/protocollen/102-003-kaderrichtlijn-water/

欧洲水框架指令（EWFD）致力于全面保护各类水体，旨在确保所有欧洲水域于2015年达到‘良好状态’，并鼓励欧洲人可持续地使用水资源。该指令的实施期限可最多延长两个6年周期，最迟至2027年。全面保护水体包括河流、湖泊、沿海水域和地下水。

评估计划
欧洲水框架指令（EWFD）着重于保护所有水体，并旨在使所有欧洲水域在2015年达到‘良好状态’，同时鼓励欧洲人可持续用水。EWFD的评估依据包括大量化学物质、物理化学参数以及四类生物群组（大型无脊椎动物、鱼类、水生植物和藻类）中物种的存在情况。

‘生态状态’是特定生物质量评估、物理化学质量、其他相关污染物质以及水生形态学的综合。生物质量通常决定生态质量。只有当该质量达到高标准时，才会考虑物理化学质量及其他相关因素的评估，以区分高、良好和相当良好的生态质量。只有当水生形态学良好时，才能达到极好质量的水平。

其他相关污染物质的质量指的是每个流域内确定的物质。‘一损俱损’原则适用于测量工具；当某一化学物质或生物测量指标未达到标准时，整体质量评估将被判定为不令人满意。通过应用这一原则，EWFD对荷兰水质进行了严格的评估。

水域类型
在这些报告中，根据配置将水域分为三种类型：自然、高度改变和人工水体。后两种类型在荷兰最为常见，但格罗宁根水域除外。只有少数溪流、小河和纳尔德湖被归类为自然水体；其他水体均被标记为高度改变。运河和沟渠属于人工水体，因为它们是人工建造的。

追求生物和物理化学质量
为确定生物和物理化学质量，制定了一个包含五个等级的量表。目标是确保水体评估结果为良好或极好。

对于自然水体，这些目标与自然参照点、极好生态状态（ZGET）相关，即地表水处于自然状态。良好质量的目的是良好生态状态（GET）。当水域因水系配置不同而高度可变时，自然参照点显然不可行。水体还可以设定一个较低的目标：良好生态潜力（GEP）。

当然，人工水体没有自然参照点，但存在最大生态潜力（MEP），目标为达到GEP。个别人工水体可以设定一个较低的GEP。

数据集可通过以下链接获取：https://www.ndff.nl/english / [e-mail]

无零值积极观察
24,501条记录（截至2018年3月）
https://www.ndff.nl/overdendff/validatie/protocollen/102-003-kaderrichtlijn-water/