Chatham County - Sewer Gravity Mains

Line features representing sanitary sewer gravity mains in Chatham County, NC sewer systems. The gravity main feature class is attributed with elevation data to indicate flow direction for the gravity mains. Chatham GIS SOP: "MAPSERV-119"本数据集的线要素（Line features）对应北卡罗来纳州查塔姆县污水系统中的卫生污水重力干管。该重力干管要素类被赋予高程数据属性，用于标识重力干管的水流流向。查塔姆县地理信息系统（Geographic Information System, GIS）标准作业程序（Standard Operating Procedure, SOP）编号为"MAPSERV-119"。