The Base System (SS)
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On the basis of the regional groundwater flow, several successive HCOVs are demarcated which are considered as a single entity: groundwater systems. The boundaries are based on the physical characteristics of the groundwater reservoirs (in addition to some regional and national borders). The systems are bounded by clear barriers to groundwater flow such as thick clay layers, geological boundaries, highly draining rivers, salinisation limits, ... There are six groundwater systems: - the Coastal and Polder System - the Central Flemish System - the Pedestal System - the Meuse System - the Central Kempen System - the Bruland Chalk System
基于区域地下水流场，研究人员划分出多个连续的水文地质汇水单元（HCOVs），并将这些单元视为统一整体，即地下水流系统。其边界以地下储水层的物理特征为核心依据，同时兼顾部分区域与国家边界。该类系统以明确的地下水流阻隔带作为边界，例如厚黏土层、地质界线、强排水河道、盐化临界值等。该数据集共包含6个地下水流系统： - 沿海与圩田系统（Coastal and Polder System） - 佛兰德斯中部系统（Central Flemish System） - 基座系统（Pedestal System） - 默兹河流域系统（Meuse System） - 肯彭中部系统（Central Kempen System） - 布鲁兰白垩系系统（Bruland Chalk System）
