Water supply concept Lower Saxony 1: 500 000 — Change in utilisation pressure for 2050 (in IST state) in dry conditions for groundwater bodies (WMS service)

The Lower Saxony water supply concept serves the overarching objective of ensuring the long-term supply of water in Lower Saxony, in particular public water supply as a key component of public services of general interest. Water supply needs to be further developed in line with current and regional challenges and with a view to sustainable groundwater management. To this end, it is necessary for policymakers and water authorities as well as for the users of the resource to be able to identify needs at an early stage in order to take measures to ensure the long-term supply of water in Lower Saxony in a timely manner. The Lower Saxony water supply concept provides a nationwide information framework necessary for this purpose. As a technical concept, it serves water users, licensing authorities and the land for water management and the public as a transparent and forward-looking basis for information and planning. Requirements for individual procedures are expressly not the objective. As part of the water supply concept, the current status (reference year 2015) and the medium- and long-term developments of Lower Saxony’s water supply are accounted for. Here, the groundwater requirement for medium and dry conditions and the water needs of the relevant groundwater users are compared at different times (2015, 2030, 2050 and 2100). The methodology of the Lower Saxony water supply concept was carried out in a grid-based manner. For this purpose, a 500 x 500 m grid was created, which extends over the whole of Lower Saxony and Bremen. National data bases for planning the current and future management of groundwater have been transferred to the grid. These formed the basis of the calculations, evaluations and final presentations carried out. The map shows the change in the utilisation pressure compared to the IST state in dry conditions for groundwater bodies at the time of 2050.下萨克森州供水理念的总体目标是保障下萨克森州的长期供水安全，其中作为公共公益服务核心组成部分的公共供水尤为关键。供水系统需结合当前及区域性挑战，并着眼于可持续地下水管理进行进一步优化完善。为此，政策制定者、水务管理机构以及水资源使用者均需能够及早识别用水需求，以便及时采取措施，保障下萨克森州的长期供水安全。下萨克森州供水理念为此提供了必要的全国性信息框架。作为一项技术框架，它可为水务使用者、许可审批机构、水管理相关主体及公众提供透明且具有前瞻性的信息与规划依据。需明确的是，本理念并不以制定单个流程的具体要求为目标。 作为该供水理念的组成部分，其涵盖了当前状态（基准年为2015年）以及下萨克森州供水的中远期发展态势。在此框架内，将针对2015年、2030年、2050年及2100年四个时间节点，对比中等水文情景与干旱情景下的地下水需水量，以及相关地下水使用者的用水需求。 下萨克森州供水理念的方法论采用网格化方法开展。为此，构建了覆盖整个下萨克森州及不来梅州的500×500米地理网格。用于规划当前及未来地下水管理的国家级数据库已完成网格适配转换，以此作为计算、评估及最终成果呈现的核心基础。 本地图展示了2050年时，不同地下水单元在干旱情景下相较于基准现状的地下水开发利用压力变化情况。