Headwall maintained by King County Roads Division

For more information about this layer please see the GIS Data Catalog. Headwall is a wall of masonry or concrete built at the outlet of a drainpipe or culvert with the end of the conduit flush with the outer surface of the wall如需了解该图层的更多信息，请查阅地理信息系统（Geographic Information System）数据目录。出口端墙（Headwall）是指建于排水管或暗渠出口处的砖石或混凝土墙体，且管道末端与该墙体的外表面齐平。