Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban model
Paved surfaces, increased precipitation intensities in addition to limited capacity in the sewer systems, cause a higher risk of combined sewer overflows (CSOs). Sustainable drainage systems (SUDS) offer an alternative approach to mitigate CSO by managing the stormwater locally. Seven SUDS scenarios...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2020-12-01
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| Series: | Hydrology Research |
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| Online Access: | http://hr.iwaponline.com/content/51/6/1437 |
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| author | Ragni R. Hernes Ashenafi S. Gragne Elhadi M. H. Abdalla Bent C. Braskerud Knut Alfredsen Tone M. Muthanna |
| author_facet | Ragni R. Hernes Ashenafi S. Gragne Elhadi M. H. Abdalla Bent C. Braskerud Knut Alfredsen Tone M. Muthanna |
| author_sort | Ragni R. Hernes |
| collection | DOAJ |
| description | Paved surfaces, increased precipitation intensities in addition to limited capacity in the sewer systems, cause a higher risk of combined sewer overflows (CSOs). Sustainable drainage systems (SUDS) offer an alternative approach to mitigate CSO by managing the stormwater locally. Seven SUDS scenarios, developed based on the concept of effective impervious area reduction, have been implemented in the Grefsen catchment using the Mike Urban model. This study evaluated the hydrological performance of two SUDS controls (i.e. green roof (GR) and rain garden (RG)) modules of the model and the effect of the SUDS scenarios on the CSOs using event-based and continuous simulations. The Nash–Sutcliffe efficiency (NSE) along with flow duration curves (FDCs) has been used for evaluating the model performance. Event-based evaluations revealed the superior performance of the RG in reducing CSOs for larger precipitation events, while GRs were proven to have beneficial outcomes during smaller events. The study illustrated another way of assessing the continuous simulations by employing the FDCs. The FDCs were assessed against a discharge threshold at the outlet (which authorities can set as design criteria) of the catchment in terms of the extent, each scenario reduced occurrence and duration of outflow that invokes flow in the overflow pipe. HIGHLIGHTS
This paper demonstrates merits of the SUDS concept for mitigating the challenges climate change pose on combined sewer systems using two SUDS controls and seven SUDS scenarios.;
It illustrates how the flow duration curve (FDC) based evaluation approach can be of great practical significance, thereby contributing to the discussion on adaptation of such design criteria in the future.;
It evaluates efficiency of the implemented SUDS measures extensively by employing a range of performance evaluation techniques.;
The use of Mike Urban model's low-impact-development module for implementing SUDS controls makes this manuscript a pioneering research work, as this is the model of choice among many practitioners across the world.; |
| first_indexed | 2024-12-19T05:51:06Z |
| format | Article |
| id | doaj.art-feb50ac402924bd6905ee6d5ca2e21fb |
| institution | Directory Open Access Journal |
| issn | 1998-9563 2224-7955 |
| language | English |
| last_indexed | 2024-12-19T05:51:06Z |
| publishDate | 2020-12-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Hydrology Research |
| spelling | doaj.art-feb50ac402924bd6905ee6d5ca2e21fb2022-12-21T20:33:37ZengIWA PublishingHydrology Research1998-95632224-79552020-12-015161437145410.2166/nh.2020.070070Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban modelRagni R. Hernes0Ashenafi S. Gragne1Elhadi M. H. Abdalla2Bent C. Braskerud3Knut Alfredsen4Tone M. Muthanna5 Sweco Norge AS, Dammensveien 260, Postboks 80, Skøyen, 0212 Oslo, Norway Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway City of Oslo, Agency for Water and Wastewater Services, Herslebsgate 5, 0561 Oslo, Norway Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway Department of Civil and Environmental Engineering, Norwegian University of Science and Technology (NTNU), Trondheim, Norway Paved surfaces, increased precipitation intensities in addition to limited capacity in the sewer systems, cause a higher risk of combined sewer overflows (CSOs). Sustainable drainage systems (SUDS) offer an alternative approach to mitigate CSO by managing the stormwater locally. Seven SUDS scenarios, developed based on the concept of effective impervious area reduction, have been implemented in the Grefsen catchment using the Mike Urban model. This study evaluated the hydrological performance of two SUDS controls (i.e. green roof (GR) and rain garden (RG)) modules of the model and the effect of the SUDS scenarios on the CSOs using event-based and continuous simulations. The Nash–Sutcliffe efficiency (NSE) along with flow duration curves (FDCs) has been used for evaluating the model performance. Event-based evaluations revealed the superior performance of the RG in reducing CSOs for larger precipitation events, while GRs were proven to have beneficial outcomes during smaller events. The study illustrated another way of assessing the continuous simulations by employing the FDCs. The FDCs were assessed against a discharge threshold at the outlet (which authorities can set as design criteria) of the catchment in terms of the extent, each scenario reduced occurrence and duration of outflow that invokes flow in the overflow pipe. HIGHLIGHTS This paper demonstrates merits of the SUDS concept for mitigating the challenges climate change pose on combined sewer systems using two SUDS controls and seven SUDS scenarios.; It illustrates how the flow duration curve (FDC) based evaluation approach can be of great practical significance, thereby contributing to the discussion on adaptation of such design criteria in the future.; It evaluates efficiency of the implemented SUDS measures extensively by employing a range of performance evaluation techniques.; The use of Mike Urban model's low-impact-development module for implementing SUDS controls makes this manuscript a pioneering research work, as this is the model of choice among many practitioners across the world.;http://hr.iwaponline.com/content/51/6/1437bioretention cellflow duration curvegreen roofrain gardensustainable urban drainage system |
| spellingShingle | Ragni R. Hernes Ashenafi S. Gragne Elhadi M. H. Abdalla Bent C. Braskerud Knut Alfredsen Tone M. Muthanna Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban model Hydrology Research bioretention cell flow duration curve green roof rain garden sustainable urban drainage system |
| title | Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban model |
| title_full | Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban model |
| title_fullStr | Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban model |
| title_full_unstemmed | Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban model |
| title_short | Assessing the effects of four SUDS scenarios on combined sewer overflows in Oslo, Norway: evaluating the low-impact development module of the Mike Urban model |
| title_sort | assessing the effects of four suds scenarios on combined sewer overflows in oslo norway evaluating the low impact development module of the mike urban model |
| topic | bioretention cell flow duration curve green roof rain garden sustainable urban drainage system |
| url | http://hr.iwaponline.com/content/51/6/1437 |
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