Abstract
The aim of this study was to propose a new methodology for reservoir rainwater dimensioning based on probabilistic modeling. Eucalyptus seedlings grown in a greenhouse were used to obtain a hypothetical water demand. Meteorological data were used to estimate the demand (evapotranspiration) and offer (rainfall over the greenhouse coverage). The probability distribution of Wakeby presented the best fit for the rainfall data; therefore, a Wakeby distribution was used to model the flow-duration curve of the greenhouse coverage. For a payback period (T) of 10 years of surplus water demand and water supply deficit, a reservoir with 13.60 m³ was obtained. The proposed methodology combined the simultaneous occurrence of the events to enable the scaling out of a reservoir with high safety to supply the required demand (T = 100 years) and therefore enables a lower cost of deployment compared to each approach separately (T = 10 years).
Highlights
IntroductionWater scarcity problems, which are caused by raising demands and poor fountain conservation, represent one of the primary difficulties faced by agencies responsible for the administration of water resources (UN–Water, 2014)
Water scarcity problems, which are caused by raising demands and poor fountain conservation, represent one of the primary difficulties faced by agencies responsible for the administration of water resources (UN–Water, 2014).When access to water resources is limited, reservoirs for rainwater harvesting (RRWH) become important water supply alternatives
The Wakeby distribution presented the best fit according to the Anderson-Darling test (Equation 9)
Summary
Water scarcity problems, which are caused by raising demands and poor fountain conservation, represent one of the primary difficulties faced by agencies responsible for the administration of water resources (UN–Water, 2014). When access to water resources is limited, reservoirs for rainwater harvesting (RRWH) become important water supply alternatives. Moments of limited water resources can result during a low qualitative and quantitative availability of fountains, as. Agronomy observed in the water crisis in the Northeast and Southeast of Brazil in 2012/2014. This can occur when there is excessive demand by the users of hydrographic basins, such as the basins of the rivers Piracicaba, Capivari and Jundiaí (PCJ) (Agência Nacional de Águas [ANA], 2014). Reservoirs for rainwater harvesting only require an area to harvest the incident rainwater to reserve the generated outflow
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