H3Dv2.1 A0504, isohypses of top Bartoon sand 2

This layer gives the isohypes of the A0504 top, as defined in the 3D hydrogeological model of the Flemish substrate – version 2.1. The hydrogeological 3D model was drawn up in the framework of the Flemish Government’s management agreement with VITO, known as VLAKO, on behalf of the Flemish Environmental Agency本图层呈现了佛兰德斯基底三维水文地质模型（版本2.1）中所定义的A0504顶面等水头线。该三维水文地质模型系佛兰德斯政府代表佛兰德斯环境署，与VITO签署的VLAKO管理协议框架下编制而成。