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Impact of Rainwater Harvesting on the Drainage System: Case Study of a Condominium of Houses in Curitiba, Southern Brazil
Andréa Teston, 1 Celimar Azambuja Teixeira, 2 Enedir Ghisi, 1 Ernani Benincá Cardoso 3
1  Laboratory of Energy Efficiency in Buildings, Department of Civil Engineering, Federal University of Santa Catarina, Florianópolis, Santa Catarina 88040-900, Brazil
2  Department of Civil Engineering, Federal Technological University of Paraná, Curitiba, Paraná 81280-340, Brazil
3  Department of Civil Engineering, Pato Branco Faculty, Pato Branco, Paraná 85503-350, Brazil

Published: 18 August 2018 by MDPI in Water
MDPI, Volume 10; 10.3390/w10081100
Abstract: The objective of this work is to assess the impact of rainwater use in single-family houses on drinking water consumption and on the urban drainage system by means of a case study of a condominium of houses in the city of Curitiba, southern Brazil. A quantitative evaluation of the rainwater volume used and spilled in the recovery system was carried out using two methods for sizing the rainwater tank capacity. Using daily rainfall data and three demand scenarios of water consumption, it was possible to verify the efficiency and reliability of the adopted systems. Furthermore, in order to verify the impact on drainage, the greatest rainfall in the series was assessed and then it was possible to measure it by comparing the hydrograph peak flows with and without the rainwater harvesting systems in the watershed outfall, corresponding to the storage tanks (concrete boxes) in the condominium. It was concluded that there was a decrease in the peak flow of 4.9% and 4.4%, respectively, in the two storage tanks evaluated when the rainwater tank capacities were estimated using the method based on the German Practical Method.
Keywords: Brazil, water conservation, urban drainage, rainwater use
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