Webgis data 2020 and 2021

Starting from the data measured through laboratory tests during 2020 and 2021, a set of parameters have been evaluated. Each day of analysis has been associated to a class, basing on thementioned values. In such a way it was possible to compute the percentage of times in which the water from a specific plant has been in the different classes .

Collecting the data measured in each plant, the four classes have been defined setting limit values of these parameters. 

a set of rules was defined in order to identify the dominant water quality class for each WWT plant, based on the previously obtained percentages.

:•If the effluent falls in water quality class A at least 90% of the time →the dominant class for that plant is A.

•If the effluent falls in water quality class A less than 90% of the time AND 0% of the time in class D →the dominant class for that plant is B.

•If the effluent falls in water quality class A less than 90% of the time AND below 10% in class D →the dominant class for that plant is C.

•If the effluent fallsin water quality class D more than 10% of the time →the dominant class for that plant is D.

This allowed a classification of the available WWTPs according to their dominant class and, thus, application of the EU regulation 2020/741. Therefore, for each WWTP, the WebGIS can show what crop types can be irrigated with their effluent, as well as the allowed irrigation method/s

本数据集基于2020至2021年间实验室检测所得的实测数据，对一系列水质参数开展了评估分析。以上述检测值为依据，为每日分析结果赋予对应水质类别，并据此计算得出各污水处理厂出水落入不同水质类别的占比。

通过整合各污水处理厂的实测数据，结合上述参数的限值范围，划定了共四类水质等级。

基于前述计算得到的占比，制定了一套规则以判定各污水处理厂的主导水质等级：
• 若某污水处理厂的出水在至少90%的时间内均落入水质类别A，则该厂主导水质等级为A。
• 若该厂出水落入水质类别A的占比不足90%，且未出现落入类别D的情况，则主导水质等级为B。
• 若该厂出水落入水质类别A的占比不足90%，且落入类别D的占比低于10%，则主导水质等级为C。
• 若该厂出水落入水质类别D的占比超过10%，则主导水质等级为D。

据此可根据主导水质等级对现有污水处理厂进行分类，并应用欧盟法规2020/741。针对每座污水处理厂，其配套的网络地理信息系统（WebGIS）可展示可使用该厂出水进行灌溉的作物类型，以及允许采用的灌溉方式。