建築物中排水管路系統的生命週期比建築構造要短得多，因此在整個建築物生命週期中經常需要予以維護和進行系統更新。台灣的集合住宅建築通常將排水管路系統設置於樓板下，因而在建築物生命週期中造成維護和更新工作上的問題。本研究針對同層排水技術和基本排水設備性能之課題，對建築物排水系統設計解決方案以及集合住宅在實務上遭遇的排水問題進行研究，並透過問卷調查和統計分析來確定同層排水技術的可行性和設計策略。對於同層排水技術，仍然有許多現場施作程序和施工方法應予以整合和規範。本研究結果揭示了在集合住宅建築中採用同層排水技術進行最佳調適和應用的可行性。

The life cycle of drainage plumbing systems in buildings is far shorter than that of buildings themselves, thus maintenance and system reform are often necessary during the life cycle of a building. The construction industry in Taiwan usually put the drainage plumbing system under the floor which caused problems for maintenance and retrofitting work during the building’s life cycle. This research focused on same-floor drain technology and the fundamental performance issues involved, and conducted surveys regarding solutions for the design of building drainage systems. The current practical drainage issues in residential buildings were investigated. Questionnaires and statistical analysis were used to figure out the feasibility and design strategy for same-floor drain technology. There are still many field procedures and construction methods that should be integrated and regulated for same-floor drain technology. The results reveal the feasibility of optimal adaptation and application for same-floor drain technology in residential buildings.