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The management of water use has been subject in international and national meetings of organizations related with water resource, in which the use of non-potable water its been indicated as a solution for the shortage issue. Though, the generalized use of rainwater becomes a problem once, many of rainwater systems aren't at the framework of the current legislation, cant provide enough rainwater for its aimed function, causing, thus, insufficiency in the supply, economic inefficiency and ,most severely, contamination of this water for pathogens, implying in serious healthy damage for the users. Therefore, in the present work, the viability of the implementation of rainwater systems for four types of residential buildings is analyzed. The analysis were based in the consumption of potable water that can be exchanged for rainwater, as in water closet flush, watering lawns and washing sidewalks and floors, in rainfall rates of some Brazilian regions and in dimensions of collect areas. The dimensioning was based on ABNT- NBR 15527/07, focused basically in the calculation of demands and reservatories volumes. With this data, several scenarios were assembled, which the viability of implementation was analyzed. The present

Viabilidade de utilização de água pluvial em edificações