Retrofit of grass swales with outflow controls for enhancing drainage capacity

Reduction of runoff flow peaks and volumes is one of the performance objectives of grass swales in the context of Green Stormwater Infrastructure (GSI). Towards this end, a study of the feasibility of using a retrofitted swale outlet control weir (SOCW) to reduce runoff volume and peak flow, by enha...

Full description

Bibliographic Details
Published in:Journal of Hydrology
Main Authors: Mantilla, Ivan, Flanagan, Kelsey, Broekhuizen, Ico, Muthanna, Tone Merete, Marsalek, Jiri, Viklander, Maria
Format: Article in Journal/Newspaper
Language:English
Published: Luleå tekniska universitet, Arkitektur och vatten 2024
Subjects:
Grass swales
Design modifications
Hydrological performance
Infiltration capacity
Storage functions
Swale outflow control
Water Engineering
Vattenteknik
Weir
Luleå
Northern Sweden
Online Access:http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-108372
https://doi.org/10.1016/j.jhydrol.2024.131637
Description
Summary:Reduction of runoff flow peaks and volumes is one of the performance objectives of grass swales in the context of Green Stormwater Infrastructure (GSI). Towards this end, a study of the feasibility of using a retrofitted swale outlet control weir (SOCW) to reduce runoff volume and peak flow, by enhancing swale runoff storage and infiltration into swale soils, was conducted in Luleå, Northern Sweden. Experimental field work consisted of 43 irrigation-driven runoff experiments, mimicking rainfall events with return periods between 1- to 50-years, with a constant intensity and duration of 30 min, in a 30-m long grass swale section. Experimental results confirmed that, under the tested conditions, swales with the retrofitted outflow control, reduced runoff volumes and peak flows. Such reductions ranged from 32 percentage points (for 2-year) to 1 and 4 percentage points (for 50-year return period) for runoff volumes and peak flows, respectively. Outcomes of scenarios with outflow controls clearly indicated a decreasing performance with increasing flow rates (and irrigation event return periods). Furthermore, the retrofitted swale controlled the outflow release during less frequent 20 to 50-year events, which would contribute to reducing flood risks in downstream urban areas. Validerad;2024;Nivå 2;2024-07-22 (signyg); Fulltext licence: CC BY

Similar Items