Flood Defence Structures

The National Flood Asset Database records flood infrastructure in Wales managed by Lead Local Flood Authorities (LLFAs) and Natural Resources Wales (NRW). It includes many embankments, walls, flood gates, culverts, and inlet screens (which catch debris), but not all flood infrastructure maintained or owned by these parties. This infrastructure has been constructed to help manage the risk of flooding from rivers and the sea. They do not remove the risk of flooding and can be overtopped, blocked, or fail in extreme weather conditions. Three datasets are available as open data.
1. Flood defence Locations. These show the linear alignment of flood defence asset that have been built to protect against flooding from rivers and the sea. It includes the type, length, maintainer, and an ID. These defence locations are also shown in Flood Risk Assessment Wales (FRAW), Flood Map for Planning (FMfP) and Find flood defence structures near you maps. They may relate to an Area Benefiting from Flood Defence (FRAW) and TAN15 zone (FMfP).
2. Culverts (Polyline); These show an indicative location of underground culverts for general guidance only. Attributes include maintainer, owner, length and ID. Due to the underground nature and history of many culverts, the locations may not be accurate, complete, or up to date.
3. Culvert openings and Screens (Points). These show an indicative location of culvert openings and screens (often referred to as Trash or Debris Screens). Attributes include maintainer, owner and ID. Locations and details may not be accurate, complete or up to date.
We are currently not able to show information for the following local authorities: Flintshire, Newport.
We will regularly update the information when new and improved data becomes available. If you have any queries or concerns about location, maintenance, condition, or records of flood assets, check with the owner or maintainer.

国家洪水资产数据库记录了威尔士地区由主要地方洪水管理机构（LLFAs）和自然资源威尔士（NRW）管理的洪水基础设施。该数据库涵盖了众多堤坝、墙体、防洪闸门、涵洞以及入口筛网（用于拦截杂物），但并非所有由上述机构维护或拥有的洪水基础设施均包含在内。此类基础设施的建造旨在协助管理河流和海洋引发的洪水风险。然而，它们并不能消除洪水风险，且在极端天气条件下可能发生溢出、堵塞或失效。本数据库提供三个数据集作为开放数据：
1. 防洪设施位置。这些数据展示了为抵御河流和海洋洪水而建造的防洪资产的线性排列，包括类型、长度、维护者和ID。这些防御位置亦在威尔士洪水风险评估（FRAW）、规划用洪水地图（FMfP）以及“查找附近的防洪结构”地图中展示。它们可能与受益于防洪设施的区域（FRAW）和TAN15区域（FMfP）相关。
2. 涵洞（折线）。这些数据展示了地下涵洞的指示性位置，仅供参考。属性包括维护者、所有者、长度和ID。由于许多涵洞的地下性质和历史原因，位置可能不准确、不完整或不及时。
3. 涵洞开口和筛网（点）。这些数据展示了涵洞开口和筛网（常称为垃圾或杂物筛网）的指示性位置。属性包括维护者、所有者和ID。位置和详情可能不准确、不完整或不及时。
目前，我们无法显示飞利浦郡和新港当地政府的信息。当有新数据和改进数据可用时，我们将定期更新信息。如对位置、维护、状况或洪水资产记录有任何疑问或担忧，请咨询所有者或维护者。