该cad插件可以提取dwg文件管线信息，并直接生成swmm模型可读取的inp文件。
提取的管线信息包括管长、管径、标高、坐标、上下游拓扑关系等；
生成inp文件，可直接拖入swmm中显示。包含[OUTFALLS]，[JUNCTIONS]，[CONDUITS]，[XSECTIONS]，[COORDINATES]，[VERTICES]部分(The CAD plug-in can extract DWG file pipeline information and directly generate SWMM model readable InP files.

The extracted pipeline information includes pipe length, pipe diameter, elevation, coordinates, topological relationship between upstream and downstream, etc.)