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You are here : eLibrary : IAHR World Congress Proceedings : 36th Congress - The Hague (2015) ALL CONTENT : Hydro-environment : Assessment of the potential to reducing drinking water consumption by widespread use of rainwater ha...
Assessment of the potential to reducing drinking water consumption by widespread use of rainwater harvesting in a densely populated urban area
Author : Erick Brizon CHAIB1; Felipe RODRIGUES2, Brenner H. MAIA1, Nilo de Oliveira NASCIMENTO1
In a scenario of relative water scarcity, it is advisable to implement public policies aiming
at maintaining adequate potable water supply. A relevant alternative regarding water
supply policies is the use of rainwater harvesting in residential buildings in order to meet
the households non-potable water demands. This paper suggests a methodology to
evaluate the potential for drinking water savings in urban large-scales using rainwater
for non-potable domestic supply. Hydraulic and financial assessments were performed,
taking as case study Belo Horizonte, a 2.4 million-inhabitant city that is the capital of the
state of Minas Gerais, in Brazil. In order to deal with the variability of dwelling
characteristics (e.g.: roof area, garden and paved areas, toilets, etc.) in the urban area,
16 standard building projects were created, based on Brazilian technical standards, and
correlated to the actual dwelling characteristics as described in the Belo Horizonte
municipal cadaster. In parallel, a water demand function for Belo Horizonte in relation
to family income was also developed, based on census data and a 14-year water
consumption time series. This function allowed estimating non-potable water
consumption demand as a function of family income and dwelling characteristics. Roof
area and a 28-year rainfall time series allowed estimating the offer of non-potable water
through rainfall harvesting for the study area. Results suggest that, in a scenario of
widespread use of domestic rainwater harvesting systems, one can get the equivalent
of two months of drinking water supply as drinking water annual savings. On the other
hand, for the scenario adopted, results suggest financial feasibility of the systems,
although with a high payback and internal return rates very close to the attractive
interest rates. These results suggest that these systems dissemination may require
innovative funding models and other economic tools to promote them for large-scale
use.
File Size : 73,759 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 36th Congress - The Hague (2015) ALL CONTENT
Article : Hydro-environment
Date Published : 30/09/2015
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