WFD River Basin Districts Cycle 2

WFD River Basin Districts is a polygon Shapefile dataset containing attributes that have been collated as defined for the implementation of the Water Framework Directive (WFD). Article 2, clause 2 of the WFD defines them as '…the area of land and sea, made up of one or more neighbouring river basins together with their associated groundwaters and coastal waters…'. River Basin Districts have been delineated by using River Catchments as “building blocks” that have been aggregated together within a GIS, ensuring that WFD rivers do not intersect boundaries. Coastal and transitional waterbodies are also merged and assigned to a river basin district. River Catchments were delineated through use of flow data and a digital terrain model run through a hydrological model.
These data apply to Cycle 2 of the Water Framework Directive. The equivalent layer for Cycle 1 is covered by AfA081. Attribution statement: © Environment Agency copyright and/or database right 2015. All rights reserved.

WFD流域分区（WFD River Basin Districts）为多边形Shapefile数据集，所含属性字段均依照《水框架指令（Water Framework Directive, WFD）》的实施规范整理完成。《水框架指令》第2条第2款将其定义为“……由一个或多个相邻流域及其关联地下水与近岸海域共同构成的陆域与海域范围……”。流域分区以流域集水区（River Catchments）作为基本构建单元，通过地理信息系统（GIS）聚合生成，可确保WFD划定的河流不会跨越分区边界。近岸水体与过渡水体同样会被合并，并划归至对应流域分区。流域集水区则通过径流数据与经水文模型运算的数字地形模型完成划定。
本数据集适用于《水框架指令》第二周期（Cycle 2），其第一周期对应的图层由AfA081涵盖。版权声明：© 英国环境署（Environment Agency）2015年版权及/或数据库权利，保留所有权利。