Proposal for sustainable sanitation for low precipitation in urban areas in the Brazilian semiarid

The semiarid region of Brazil is one of the main characteristics the average index of precipitation below 800mm per year and covers a large part of the Northeast region, leading the urban populations to the rationing of water. This work proposes the application of a constructive methodology for homes, so that this can become high enough in water. It was taken as a case study, the city of Pompeii in Paraiba - Brazil. This work presents a study of the potential for storing rainwater for residences, with a view to verify the viability of a project sustainable construction. For both considered a house with 150m2 of covered area and the average rainfall of 730mm from the past seven years. The results show that without compromising the environment and architecture, it is possible to perform some changes in building projects of a residence, making it sustainable in the consumption of water and independent from the public provision of supply, reserving in their structure 105m³ of water. Considering the growth of the cities of semi-arid regions, the use of this methodology, not undermine the region's water sources and reduce public investments destined to the problem of drought in semi-arid regions of the Brazilian Northeast and with the economy of water, this could be intended to agriculture.