Open AccessInvestment feasibility analysis of rainwater harvesting in a building in Brazil
Author(s) -
Enedir Ghisi,
Liseane Padilha Thives,
R. F. W. Paes
Publication year - 2017
Publication title -
water science and technology water supply
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.318
H-Index - 39
eISSN - 1607-0798
pISSN - 1606-9749
DOI - 10.2166/ws.2017.218
Subject(s) - rainwater harvesting , payback period , internal rate of return , net present value , investment (military) , return on investment , environmental science , rate of return , present value , irrigation , cost–benefit analysis , potable water , business , environmental engineering , economics , finance , production (economics) , ecology , biology , politics , political science , law , macroeconomics
The objective of this study is to assess the investment feasibility analysis of rainwater harvesting in a building located in Brazil. Rainwater was used to supply toilets, cleaning and irrigation. The costs of materials, labour and maintenance were obtained to carry out the economic analysis; the indicators used were the net present value, internal rate of return and payback period. The investment feasibility analysis and the potential for potable water savings were obtained by means of computer simulation. The potential for potable water savings ranged from 26.70% to 64.70%. The net present value, internal rate of return and payback period for the best scenario were, respectively, R$ 132,801.47, 3.73% per month and 32 months. For the worst scenario the net present value was R$ 9,451.26, the internal rate of return was 0.91% per month and the payback period was 166 months. Thus, rainwater can be used as a sustainable alternative and be financially feasible.
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