Rainwater catchment feasibility study for non-potable consumption in buildings. / Estudo da viabilidade do aproveitamento de água de chuva para consumo não potável em edificações.

AUTOR(ES)

Simone May

DATA DE PUBLICAÇÃO

2004

RESUMO

There are conventional and non-conventional ways for water conservation. The rainwater catchment system for non-drinking use is a non-conventional way. Nowadays, the exploitation of the rainwater is found in the United States, Germany, Australia and Japan, among others. In Brazil, the system is used in some northeast cities as water supplement supply source. The feasibility of rainwater use is characterized by the reduction of the demand on water supplied by the sanitation company and, as a consequence, the reduction of costs and the reduction of flood risk in case of storm rain. In the process of rainwater catchment impermeable areas are used, in most of cases, the roof. The first water that falls and washes the roof has sufficiently high degree of contamination and therefore it is a advisable to discharge it. The rainwater caught by gutters, vertical and horizontal conductors, is stored in a rainwater reservoir, which can be made of different materials. The stored rainwater should be used only for non-drinking consumption like in the toilet, in garden taps, in car washing and in clothes laundering. This paper evaluates the rainwater quality and develops the feasibility study for rainwater catchment for non-drinking use. From an experimental system, physical, chemical and microbiological analyses of the rainwater were made to qualify and verify the need of treatment avoiding the risk of illness to users. The feasibility of the system depends firstly on three factors: precipitation, catchment area and demand. The rainwater reservoir, as the most expensive part of the system, should be designed accordingly to the consumption and the local precipitation availability to set it accordingly, without making it economically unfeasible. Based on the results of the analysis and on the rainwater catchment system, its application for non-drinking use should be stimulated.

ASSUNTO(S)

rainwater utilisation rainwater collecting system water conservation conservação de água rainwater quality qualidade da água de chuva sistema de coleta da água de chuva

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