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Influence of Design Variables on the Financial Feasibility of Rainwater Harvesting Systems

Istchuk, Rodrigo Novais ; Ghisi, Enedir

Water (Basel), 2023-03, Vol.15 (6), p.1112 [Periódico revisado por pares]

Basel: MDPI AG

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Título:
Influence of Design Variables on the Financial Feasibility of Rainwater Harvesting Systems
Autor: Istchuk, Rodrigo Novais ; Ghisi, Enedir
Assuntos: Annual rainfall ; Catchment area ; Catchment areas ; Cities ; computer simulation ; Correlation analysis ; Cost control ; Design ; Drinking water ; Feasibility ; Feasibility studies ; financial feasibility ; Harvesting ; Indicators ; Influence ; Inhabitants ; Internal rate of return ; Net present value ; Operating costs ; Payback periods ; Potable water ; Precipitation ; Rain ; Rain and rainfall ; Rain water ; Rain-water (Water-supply) ; rainfall indicators ; Rainwater recovery systems ; Resource management ; Seasonal variations ; Seasonality ; Sensitivity analysis ; Time series ; Utility rates ; Variables ; Water demand ; Water harvesting ; Water management ; Water rates ; Water resources ; Water resources management
É parte de: Water (Basel), 2023-03, Vol.15 (6), p.1112
Descrição: Extensive implementation of rainwater harvesting (RWH) systems can promote substantial improvement in urban water resource management. Therefore, establishing the financial feasibility of RWH systems is imperative for their dissemination. This study evaluated the influence of rainfall time series indicators (average annual rainfall, seasonality index and behaviour of periods without precipitation) and design variables (catchment area, rainwater demand, number of inhabitants, potable water demand and rainwater tank size) on the financial feasibility of RWH systems in eight Brazilian cities. Correlations between rainfall indicators and financial feasibility were introduced, along with sensitivity analysis of design variables. Financial feasibility was obtained in 30% to 70% of the simulated scenarios. Initial investment and operating costs varied significantly among the eight cities according to local prices. Systems with a catchment area of 200 m2 were capable of supplying, on average, 90.5% of the maximum rainwater consumption observed in this study. Local variation of potable water tariff schemes affected the financial feasibility of RWH systems. The number of inhabitants was the most influential design variable on the financial feasibility of RWH systems, followed by the rainwater tank size. Places with lower rainfall seasonality indexes and lower incidence and duration of dry periods are likely to lead to greater financial feasibility.
Editor: Basel: MDPI AG
Idioma: Inglês

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Influence of Design Variables on the Financial Feasibility of Rainwater Harvesting Systems

Istchuk, Rodrigo Novais ; Ghisi, Enedir

Basel: MDPI AG

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