The European Water Framework Directive demands to assess and report the chemical and ecological status of water bodies (WB). Linking their status to drivers and pressures and deriving suitable mitigation measures require knowledge of the shape and area of WB catchments. We derived a network of 26 570 WB catchments in Germany using the hydrologically-defined drainage basins of the German federal states. We established a network of 338 149 drainage basins. This network underwent plausibility checks and a validation with the catchment areas of 348 monitoring stations across Germany. To this network, we assigned the longest intersecting or the next downstream WB code. To account for geometric inaccuracies we revised spurious intersections resulting in splittings and cycles in the WB network. As WB may be ecologically but not hydrologically well defined, we split them at confluences and intersections. The network of drainage basins matched the monitoring stations with a Nash-Sutcliffe efficiency of 1.00. The final WB network contained 11 005 out of the 11 586 original WBs longer than 1 m. The corresponding local catchment areas range from <<0.0001 to 446 km², with a median of 10 km². The dataset combines the requirements of hydrological and ecological modelling applications at basin or national scales with the needs of the EU reporting which can foster their acceptance by state authorities and river-basin management.

中文翻译：

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德国地表水体的集水区

欧洲水框架指令要求评估和报告水体 (WB) 的化学和生态状况。将它们的状态与驱动因素和压力联系起来并得出合适的缓解措施需要了解 WB 流域的形状和面积。我们使用德国联邦州的水文定义流域在德国推导出了一个由 26 570 个 WB 流域组成的网络。我们建立了一个由 338 149 个流域组成的网络。该网络经过了合理性检查，并在德国 348 个监测站的集水区进行了验证。对于这个网络，我们分配了最长的相交或下一个下游 WB 代码。为了解决几何误差，我们修改了导致 WB 网络分裂和循环的虚假交叉点。由于 WB 可能在生态上但在水文上没有明确定义，我们在汇合处和交叉点处将它们分开。流域网络与 Nash-Sutcliffe 效率为 1.00 的监测站相匹配。最终的 WB 网络包含 11 586 个长度超过 1 m 的原始 WB 中的 11 005 个。相应的当地集水区范围从<<0.0001到446公里²，中位数为 10 km ²。该数据集将流域或国家尺度的水文和生态建模应用的要求与欧盟报告的需求相结合，可以促进国家当局和流域管理部门的接受。