Groundwater equalisation plan

The groundwater equilibrium plan describes the large-scale flow directions and gradients of groundwater by means of the representation of the groundwater pressure area at lines of the same height (isohypses in [m ü NN]). Essentially, the groundwater isohypses are provided for the upper main aquifer. In addition, the map provides indications of spread areas of the main aquifer, geological disturbances, stream shrinkages, groundwater sheaths, and artesian groundwater conditions.

地下水均衡图通过绘制同一高程下的地下水压力等值线（即isohypses，单位为米，采用NN基准[m ü NN]），阐明了地下水的大范围流动方向与水力梯度。该图件所涉及的地下水头等势线均针对上部主要含水层编制。此外，该图件还标注了主要含水层的分布范围、地质扰动区域、河道萎缩段、地下水鞘以及承压水发育条件。