The causes of indoordrainage pipeline blockage are analyzed from three aspects of design process, construction methods, post-use maintenance and effective prevention measures are proposed.
从设计过程、施工环节、后期使用维护等三方面分析室内排水管道堵塞的原因，并提出有效地防止措施。
2
It had incredible public amenities, footpaths, schools, an indoor bath, complex drainage and enclosed fields.
城里有难以置信的公共设施：人行道、学校、室内浴场、复杂的排水系统和围起来的农田。
3
Moreover, it analyzes the effect of earthquake to outdoor and indoor water supply and drainage equipments.