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Keywords = SQID

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18 pages, 2463 KB  
Review
Mapping the Research Landscape of Stormwater Quality Improvement Devices: Trends, Influencers, and Thematic Evolution (1992–2024)
by Sesugh Yua, Gokhan Yildirim, Mohammad Ataul Morshed, Monisha Anindita, Mohammad A. Alim and Ataur Rahman
Water 2025, 17(17), 2655; https://doi.org/10.3390/w17172655 - 8 Sep 2025
Viewed by 1269
Abstract
This study presents a comprehensive bibliometric analysis of the research landscape on Stormwater Quality Improvement Devices (SQIDs) covering 1992–2024. Using data from the Web of Science (WoS) and utilizing Bibliometrix R-package 5.1.0 and VOSviewer 1.6.20, this study identifies key trends, influential contributors, and [...] Read more.
This study presents a comprehensive bibliometric analysis of the research landscape on Stormwater Quality Improvement Devices (SQIDs) covering 1992–2024. Using data from the Web of Science (WoS) and utilizing Bibliometrix R-package 5.1.0 and VOSviewer 1.6.20, this study identifies key trends, influential contributors, and the thematic evolution within SQIDs research. The findings reveal distinct growth phases driven by policy shifts, scientific advancements, and an increasing global emphasis on sustainability. Keyword analysis highlights a significant thematic transition post-2015, with terms like performance, runoff, and management (Keyword Plus), and stormwater management, green infrastructure, and stormwater (Author Keywords) indicating a strong shift toward sustainable, nature-based solutions. Bioretention system has emerged as the most researched SQIDs, reflecting widespread academic and practical interest. The most prolific countries in SQIDs research are the USA, China, and Australia, while prominent thought leaders include Fletcher (Monash University), Wang (Guangzhou University), Shuster (US EPA), and Deletic (UNSW). Leading publication outlets include the Journal of Environmental Management, Science of the Total Environment, Journal of Hydrology, and Water. Overall, this study underscores the field’s maturation toward policy-relevant and interdisciplinary innovations, long-term performances and smart SQIDs using artificial intelligence positioning SQIDs as vital tools in addressing urban stormwater management challenges globally. Full article
(This article belongs to the Section Urban Water Management)
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19 pages, 715 KB  
Review
Copper and Zinc as Roofing Materials—A Review on the Occurrence and Mitigation Measures of Runoff Pollution
by Susanne Galster and Brigitte Helmreich
Water 2022, 14(3), 291; https://doi.org/10.3390/w14030291 - 19 Jan 2022
Cited by 18 | Viewed by 8154
Abstract
Stormwater runoff from metal roofs has been a significant subject of discussion, especially when it comes to its treatment and the target concentrations that need to be achieved prior to discharge into the aquatic environment. To raise further awareness on this issue, occurrence, [...] Read more.
Stormwater runoff from metal roofs has been a significant subject of discussion, especially when it comes to its treatment and the target concentrations that need to be achieved prior to discharge into the aquatic environment. To raise further awareness on this issue, occurrence, characterization, and also mitigation measures for metal roof runoff were analyzed using the example of copper and zinc roofs. These stormwater runoffs were found to contain metals in significant concentrations, mainly due to the wash-off of corrosion products by precipitation. Factors influencing metal corrosion and runoff concentrations were compiled. As Cu and Zn mainly occur in dissolved and thus bioavailable forms in roof runoff, harmful effects on the environment were detected. Therefore, adequate treatment of the runoff before discharge to groundwater or surface water is necessary to protect the aquatic environment. Vegetated infiltration swales as an sustainable urban drainage system enable a reduction in pollution loads. However, especially in densely built-up urban areas, stormwater quality improvement devices (SQIDs) offer an attractive alternative for pre-treating metal roof runoff, as they are mostly located underground. There is not yet a uniform legal approval system for SQIDs in Germany, but the German state of Bavaria has approved four types of SQIDs according to its own developed test criteria. Full article
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4 pages, 186 KB  
Editorial
Rainwater Management in Urban Areas
by Brigitte Helmreich
Water 2021, 13(8), 1096; https://doi.org/10.3390/w13081096 - 16 Apr 2021
Cited by 3 | Viewed by 4033
Abstract
Rising levels of impervious surfaces in densely populated cities and climate change-related weather extremes such as heavy rain events or long dry weather periods provide us with new challenges for sustainable stormwater management in urban areas. The Special Issue consists of nine articles [...] Read more.
Rising levels of impervious surfaces in densely populated cities and climate change-related weather extremes such as heavy rain events or long dry weather periods provide us with new challenges for sustainable stormwater management in urban areas. The Special Issue consists of nine articles and a review and focuses on a range of relevant issues: different aspects and findings of stormwater runoff quantity and quality, including strategies and techniques to mitigate the negative effects of such climate change impacts hydraulically, as well as lab-scale and long-term experience with pollutants from urban runoff and the efficiency of stormwater quality improvement devices (SQIDs) in removing them. Testing procedures and protocols for SQIDs are also considered. One paper analyses the clogging of porous media in the use of stormwater for managed aquifer recharge. The Special Issue demonstrates the importance and timeliness of the topic of sustainable rainwater management, especially with regard to growing cities and the challenges posed by climate change. Full article
(This article belongs to the Special Issue Rainwater Management in Urban Areas)
17 pages, 2182 KB  
Article
Influence of Temperature and De-Icing Salt on the Sedimentation of Particulate Matter in Traffic Area Runoff
by Steffen H. Rommel and Brigitte Helmreich
Water 2018, 10(12), 1738; https://doi.org/10.3390/w10121738 - 27 Nov 2018
Cited by 17 | Viewed by 5093
Abstract
Stormwater quality improvement devices use sedimentation as a pre-treatment step to separate contaminant laden particulate matter (PM) from traffic area runoff. Multiple studies describe worse settling behavior during the cold season. This paper is written in response to a decreased PM retention that [...] Read more.
Stormwater quality improvement devices use sedimentation as a pre-treatment step to separate contaminant laden particulate matter (PM) from traffic area runoff. Multiple studies describe worse settling behavior during the cold season. This paper is written in response to a decreased PM retention that was observed in the cold season during a 20-month monitoring of a sedimentation tank. However, the data was insufficient to assess the two factors that influence sedimentation during the cold season—temperature and de-icing salt application. Therefore, simplified discrete particle settling models were used to determine the influence of temperature and de-icing salt. These influences were compared to other factors, like overflow rate, particle density, and particle size distribution. To calculate the effect of temperature and de-icing salt on density and viscosity, two empirical models were applied for the first time in this field. The calculations showed that de-icing salt (NaCl) had a negligible influence on the retention of PM. However, reducing the temperature from 20 °C to 5 °C was shown to decrease the total suspended solid removal efficiency by up to 8%. The order of influencing factors was found to be particle size distribution >> overflow rate > particle density > temperature. Full article
(This article belongs to the Section Wastewater Treatment and Reuse)
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