Drainage - Controls

Point features displaying the City's drainage control structures, control manholes, and control weirs. Control weirs control flows while containing water and sewage backup. Control manholes allow for drainage pipe inspection and maintenance. Updated as an ongoing process.本数据集包含城市排水管控设施、管控检查井（control manholes）与管控堰（control weirs）的点要素（Point features）。管控堰可在截留水体与污水倒灌的同时调控水流，管控检查井则可用于排水管道的巡检与维护作业。本数据集将持续开展更新维护工作。