SWAT Literature Database for Peer-Reviewed Journal Articles

Title:Modeling sedimentation-filtration basins for urban watersheds in SWAT 
Authors:Jeong, J., N. Kannan, J.G. Arnold, R. Glick, L. Gosselink, R. Srinivasan and M.E. Barrett 
Journal:Journal of Environmental Engineering 
Volume (Issue):139(6) 
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URL (non-DOI journals): 
Broad Application Category:hydrologic and pollutant 
Primary Application Category:urban stormwater and/or BMP assessment 
Secondary Application Category:Green-Ampt infiltration application 
Watershed Description:2.81 ha drainage area to the Jollyville SedFil (sedimentation-filtration basin), located in the city of Austin in central Texas, U.S. 
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Abstract:Sedimentation-Filtration (SedFil) basins are one of the stormwater BMPs aimed to mitigate water quality problems in urban creeks and rivers. A new physically based model of variably saturated flows was developed for simulating flow and sediment in SedFils within the Soil and Water Assessment Tool (SWAT). The integrated SWAT-SedFil model allows for simulation of unsaturated flow in the filtration basin during small storms as well as fully saturated flow. The unsaturated flow is modeled using a modified Green & Ampt equation and the saturated flow is simulated by Darcy’s Law. Unsaturated flow makes up only a small fraction in large storm events; however, many regular storms are small that may generate not enough runoff to create saturated flow in the filtration basin. Therefore, the combined unsaturated/saturated flow approach for modeling SedFils improved the accuracy of the model especially in long-term evaluations. Results show that the model performs well in estimating stormwater and sediment at the inlet and outlet of a SedFil. 
Keywords:Best management practice, Storm-water management, Runoff, Sediment, Sand filters