National Highways Water Quality Priority Locations (2030 Water Quality Plan)

Overview This dataset contains information on drainage outfalls and soakaways across the National Highways strategic road network that may pose a risk to the water environment. It has been developed as part of the National Highways 2030 Water Quality Plan, which aims to prevent pollution from highway run‑off and improve water quality in both surface waters and groundwater. The dataset includes locations initially assessed as potentially high risk, along with the results of subsequent validation and verification work completed in February 2025, and the confirmed high‑priority sites published in October 2025. Background National Highways manages England’s motorways and major A‑roads, representing approximately 3% of the national road network but carrying: One third of all traffic, Two thirds of all freight Run‑off from these roads can contain contaminants such as sediments, hydrocarbons, and microplastics generated through: Tyre, brake, and road surface wear Vehicle corrosion Oil, fuel and lubricants Atmospheric deposition Without intervention, these pollutants can impact rivers, canals, lakes, groundwater, and wider ecosystems. Purpose of the Dataset This dataset supports National Highways’ commitment to manage road run‑off responsibly and improve water quality by: Identifying drainage assets that may pose a pollution risk Prioritising sites requiring further assessment or treatment Supporting design and delivery of mitigation measures Providing transparency for stakeholders and partners It underpins planning and decision-making for nature-based and engineered water quality solutions, including wetlands, filter drains, and vortex separators. Dataset Contents Depending on your specific dataset structure, this typically includes: Asset Reference Number Asset Type Road Name Nearest Waterbody Original Scope or added to Scope WQP Mitigation### 概述 本数据集收录了英国国家公路局（National Highways）战略道路网范围内可能对水环境构成风险的排水口（drainage outfalls）与渗滤坑（soakaway）相关信息。本数据集作为《英国国家公路局2030水质计划》（National Highways 2030 Water Quality Plan）的组成部分开发而成，该计划旨在防控路面径流（highway run-off）污染，改善地表水与地下水水质。数据集包含初步评估为潜在高风险的点位，以及2025年2月完成的后续验证与校核工作成果，还有2025年10月发布的确认高优先级点位。 ### 背景 英国国家公路局负责管理英格兰的高速公路与主要A级公路，该路网规模约占全国道路网的3%，但承载了全国三分之一的机动车交通与三分之二的货运交通。此类道路产生的路面径流可能含有多种污染物，包括因轮胎磨损、刹车片磨损、路面磨损、车辆腐蚀、机油/燃油/润滑油泄漏以及大气沉降产生的沉积物（sediments）、烃类污染物（hydrocarbons）与微塑料（microplastics）。若不采取干预措施，这些污染物将对河流、运河、湖泊、地下水及更广范围的生态系统造成影响。 ### 数据集用途 本数据集助力英国国家公路局履行路面径流合规管理、改善水质的承诺，具体通过以下方式实现：识别可能存在污染风险的排水设施；对需要进一步评估或治理的点位进行优先级排序；为缓解措施（mitigation measures）的设计与实施提供支持；为利益相关方（stakeholders）与合作伙伴提升透明度。本数据集为基于自然的解决方案（nature-based solutions）与工程化解决方案（engineered solutions）的规划与决策提供支撑，此类方案包括湿地（wetlands）、过滤排水沟（filter drains）与旋流分离器（vortex separators）。 ### 数据集内容 根据具体数据集结构的不同，本数据集通常包含以下字段：资产编号（Asset Reference Number）、资产类型（Asset Type）、道路名称、临近水体（Nearest Waterbody）、初始纳入范围/新增纳入范围（Original Scope or added to Scope）、WQP缓解措施（WQP Mitigation）。