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In addition, retail water use is responsible for up to 19% of public water globally supplied. Hence, this study has set out to explore the technical and economic feasibility of rainwater harvesting systems as an alternative water source for a retail store located in southern Portugal. Water consumption data from 2018 to 2021 was collected from water bills, placing average monthly water consumption at around 400\u00a0m<jats:sup>3<\/jats:sup>. Next, rainfall data was collected from the nearest meteorological station, comprising 54\u00a0years of daily rainfall data between 1932 and 2008 with an annual average of 685\u00a0mm. The simulation of a rainwater harvesting system was performed, resorting to the mass-balance model. The optimal tank size was found to be 100 m<jats:sup>3<\/jats:sup> considering simply the relation with the relative water savings variation on the graph relating the water savings with the tank size. Results show that the simulated rainwater harvesting system would allow saving 32\u201336% of the water consumed, despite the store\u2019s location in a dry climate, representing a financial gain of \u20ac330\u2013372 per month. Findings suggest a substantial potential for the technical and economic feasibility of rainwater systems in retail stores, which makes them relevant solutions to achieve important water-savings in the retail sector, thus positively influencing retailers\u2019 direct water footprint.<\/jats:p>","DOI":"10.1007\/s11356-023-25137-y","type":"journal-article","created":{"date-parts":[[2023,1,17]],"date-time":"2023-01-17T12:11:48Z","timestamp":1673957508000},"page":"42427-42442","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Potential of rainwater harvesting in the retail sector: a case study in Portugal"],"prefix":"10.1007","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9615-5434","authenticated-orcid":false,"given":"Ana","family":"Ferreira","sequence":"first","affiliation":[]},{"given":"Vitor","family":"Sousa","sequence":"additional","affiliation":[]},{"given":"Manuel","family":"Pinheiro","sequence":"additional","affiliation":[]},{"given":"In\u00eas","family":"Meireles","sequence":"additional","affiliation":[]},{"given":"Cristina Matos","family":"Silva","sequence":"additional","affiliation":[]},{"given":"Jorge","family":"Brito","sequence":"additional","affiliation":[]},{"given":"Ricardo","family":"Mateus","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,1,17]]},"reference":[{"key":"25137_CR1","unstructured":"Almeida MC, Vieira P, Ribeiro R (2006a) Efficient use of water in the urban sector. 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