摘要 : Water resources are being, over decades, intensively over explored and polluted, and it is estimated that in a few years, it is reached highly values of water stress in Europe. Portugal is already in the ranking of countries with ... 展开 Water resources are being, over decades, intensively over explored and polluted, and it is estimated that in a few years, it is reached highly values of water stress in Europe. Portugal is already in the ranking of countries with medium water stress (10-20%). To avoid the deterioration of this situation it is imperative to consider different approaches of water management, such as water reuse strategies. Toilet flushing, pavements and car washing and garden irrigation are uses in which the quantity of greywater dispended is high and the needs in terms of quality can be lower than the potable water, and so these can represent potential reuse applications in a unfamiliar dwelling. Greywater in situ reuse can be a practice to consider since its quality and quantity is enough to consider the uses referred above. In this context, a research of the quantity and quality of greywater produced in a dwelling, allows to reuse only the water with the best characteristics and so it will require a lower level of treatment. In this paper is presented the quantitative and qualitative characterization of greywater, as well as the required quantity for its reuse in some in situ non-potable urban applications. 收起