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Abstract(s)
Este estudo apresenta a viabilidade de eficiência hídrica no Centro Escolar de Santa Maria da cidade de Bragança. Para tal, são propostas duas opções para redução do consumo de água potável e é feito um estudo de viabilidade técnica e económica a 5 cenários.
Na primeira opção (2 cenários) propõe-se a substituição de dispositivos de utilização, nomeadamente torneiras. Na segunda opção (3 cenários) equaciona-se o aproveitamento de águas pluviais. Foi também analisada a mudança de comportamentos na rega por alteração de intensidade de água ou períodos de rega.
As duas opções estudadas podem ser técnica e economicamente implementadas, levando a uma redução significativa na fatura da água. Na opção 1, substituindo as torneiras existentes por torneiras de eficiência hídrica, estimam-se poupanças anuais de água até 46,3% e períodos de retorno do investimento até 2 anos. Em 15 anos podem ser alcançadas poupanças acumuladas de €74.072,02. Por outro lado, na opção 2, utilizando um reservatório com volume de 15 m3, estima-se ser possível aproveitar 569,8 m3 (85%) de água pluvial total. Aliando ao cenário de aproveitamento de águas pluviais para abastecimento de autoclismos, a instalação de torneiras eficientes de 1,8 L/min ou 5,0 L/min, estimam-se poupanças anuais de água de 75,6% e 64,5%, períodos de retorno do investimento de 4 e 5 anos, alcançando-se em 15 anos poupanças acumuladas de €97.257,07 e €79.827,66, respetivamente.
Desta forma, a proposta de medidas para um uso eficiente da água no Centro Escolar, poderá contribuir para diminuir os riscos de escassez hídrica na região e ser uma mais valia em termos económicos para o Município.
This study presents the feasibility of water efficiency in the Santa Maria School Center of Bragança city. To this end, two options to reduce the consumption of potable water are proposed and is made a technical and economic feasibility study for 5 scenarios. In the first option (2 scenarios) it is proposed to replace water using devices such as taps. In the second option (3 scenarios) the use of rainwater is considered. It was also analysed the change of irrigation behaviors by alteration of water intensity or irrigation periods. Both options can be technically and economically implemented, leading to a significant reduction in water invoice. In the option 1, replacing existing taps by water-efficient taps, it is estimated annual water savings until 46.3% and return periods of the investment until 2 years. In 15 years cumulative savings of €74,072.02 can be achieved. On the other hand, in the option 2, using a reservoir with a volume of 15 m3, it is estimated that 569.8 m3 (85%) of total rainwater can be used. Combining the scenario of using rainwater to flushing cisterns, the installation of efficient taps of 1.8 L/min or 5.0 L/min, it is estimated annual water savings of 75.6% and 64.5%, return periods of the investment of 4 and 5 years, reaching cumulative savings of €97,257.07 and €79,827.66, respectively, in 15 years. Thus, the proposed measures for the efficient use of water in the School Center may contribute to reduce the risks of water scarcity in the region and be an economic advantage for the Municipality.
This study presents the feasibility of water efficiency in the Santa Maria School Center of Bragança city. To this end, two options to reduce the consumption of potable water are proposed and is made a technical and economic feasibility study for 5 scenarios. In the first option (2 scenarios) it is proposed to replace water using devices such as taps. In the second option (3 scenarios) the use of rainwater is considered. It was also analysed the change of irrigation behaviors by alteration of water intensity or irrigation periods. Both options can be technically and economically implemented, leading to a significant reduction in water invoice. In the option 1, replacing existing taps by water-efficient taps, it is estimated annual water savings until 46.3% and return periods of the investment until 2 years. In 15 years cumulative savings of €74,072.02 can be achieved. On the other hand, in the option 2, using a reservoir with a volume of 15 m3, it is estimated that 569.8 m3 (85%) of total rainwater can be used. Combining the scenario of using rainwater to flushing cisterns, the installation of efficient taps of 1.8 L/min or 5.0 L/min, it is estimated annual water savings of 75.6% and 64.5%, return periods of the investment of 4 and 5 years, reaching cumulative savings of €97,257.07 and €79,827.66, respectively, in 15 years. Thus, the proposed measures for the efficient use of water in the School Center may contribute to reduce the risks of water scarcity in the region and be an economic advantage for the Municipality.
Description
Keywords
Eficiência hídrica Aproveitamento de águas pluviais Centro Escolar Viabilidade técnico-económica