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Vietnam. Ha Tay province. Dai Tu. A woman, wearing a traditional vietnamese hat, walks on a board over the new sewage system. Blue-collar workers. Through the construction of a main drainage and the building of sewerage as a combined system, collecting both rainwater and domestic waste water, the implementation of a flexible decentralized community sanitation project in a context of low infrastructure investment and in a peri-urban case study, such as Dai Tu, will be a major sucesss. It offers importants benefits as an alternative to centralized systems, namely in terms of health improvements and by the possibility of dealing with wastewater locally, through households and decentralized municipal structures.  Dai Tu is a typical hamlet (village) and is part of the Kim Chung commune located 15 km west of Hanoi. The peri-urban location is under increasing pressure of urbanization. 06.04.09  © 2009 Didier Ruef