Methodology to Optimize Rainwater Tank-sizing and Cluster Configuration for a Group of Buildings

Jersain Gómez Núñez (), Magdalena García Martínez (), Rojacques Mompremier (), Beatriz A. González Beltrán () and Icela Dagmar Barceló Quintal ()
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Jersain Gómez Núñez: Universidad Autónoma Metropolitana, Unidad Azcapotzalco
Magdalena García Martínez: Universidad Autónoma Metropolitana, Unidad Lerma
Rojacques Mompremier: Universidad Autónoma Metropolitana, Unidad Azcapotzalco
Beatriz A. González Beltrán: Universidad Autónoma Metropolitana, Unidad Azcapotzalco
Icela Dagmar Barceló Quintal: Universidad Autónoma Metropolitana, Unidad Azcapotzalco

Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), 2022, vol. 36, issue 13, No 17, 5205 pages

Abstract: Abstract The behavior of a rainwater harvesting system depends on some variables that cannot be controlled, such as rainfall, building roof size and water consumption. The selection regarding rainwater tank-size will affect the performance of the system and the cost–benefit ratio. The criterion employed for this selection is based on the need for volume-storage and typically, yield large-sized rainwater tanks, especially when the amount of rainwater is higher during rainy seasons. This article presents a methodology for modelling rainwater harvesting, storage, and water consumption, for different configurations of a set of buildings, called clusters, where all buildings collect, store and consume water. This methodology allows for analyzing with different indicators, what is the best recommended configuration and tank-sizing, based on configuration and storage ratio exhibited, thus avoiding the situation of being underutilized. The proposed methodology is applied to a case of study at a university, in Mexico City. In this study case, the dynamics per day is modeled over a year, considering monthly rainfall averages, over 2 groups made up out of 4 buildings with different collecting capabilities and consumption each, allowing for the analysis of 9 cluster configurations and 4 rainwater tank-sizing dimensions. The results are analyzed by means of annual indicators such as: the decrease in the volume used from the public water network, the days of autonomy of the system, and a coefficient $$R$$ R (which relates the volume spilled to the empty volume). This coefficient is then used selection regarding rainwater tank-sizing and the most recommended cluster configuration.

Keywords: Rainwater harvesting cluster; Optimal rainwater tank-sizing; Water balance model; Performance annual indicators (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s11269-022-03299-7

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