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Empirical relationships between rainfall and runoff were developed for both roofs, and applied to historical rainfall data in order to compare stormwater retention values for different rainfall depths. Crop coefficients for the vegetation on each green roof were estimated using the soil moisture extraction function. This function was also used to estimate monthly evapotranspiration. Despite being irrigated, the green roof with native vegetation retained more stormwater per annum (64%) than the non-irrigated green roof planted with <jats:italic>Sedum<\/jats:italic> spp. (54%). The green roof planted with native vegetation also had approximately twice the crop coefficient (1.13) than the green roof planted with <jats:italic>Sedum<\/jats:italic> spp. (0.57), indicating that the New York City native plants transpire more stormwater than the <jats:italic>Sedum<\/jats:italic> spp. plants given certain climate and substrate moisture conditions. Overall, the results of the study indicate that, for the New York City climate region, irrigated green roofs of native vegetation have the capacity to better manage stormwater than non-irrigated green roofs planted with drought-tolerant succulents.<\/jats:p>","DOI":"10.1371\/journal.pone.0266593","type":"journal-article","created":{"date-parts":[[2022,4,20]],"date-time":"2022-04-20T17:25:19Z","timestamp":1650475519000},"page":"e0266593","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":16,"title":["Comparing the hydrological performance of an irrigated native vegetation green roof with a conventional Sedum spp. green roof in New York City"],"prefix":"10.1371","volume":"17","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1025-1992","authenticated-orcid":true,"given":"Nandan H.","family":"Shetty","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert 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